diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 01609e7..e070a53 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: ['ubuntu-latest']
-        php: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php: ['8.1', '8.2', '8.3', '8.4']
 
     steps:
       - name: Checkout
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 6de33d4..5e6d7a5 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -13,8 +13,8 @@
     ->setRules([
         '@PER-CS2.0' => true,
         '@PER-CS2.0:risky' => true,
-        '@PHP74Migration' => true,
-        '@PHP74Migration:risky' => true,
+        '@PHP81Migration' => true,
+        '@PHP80Migration:risky' => true,
         '@PHPUnit84Migration:risky' => true,
         'no_alias_functions' => true,
     ])
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7547f7c..b22d1ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased](https://github.com/Art4/json-api-client/compare/1.2.0...v1.x)
 
+### Changed
+
+- Dropped support for PHP 7.4 and PHP 8.0
+
+### Deprecated
+
+- `\Art4\Accessable::get()` will add `mixed` as a native return type declaration in 2.0.0, do the same in your implementation now to avoid errors.
+- `\Art4\Manager::getParam()` will add `mixed` as a native return type declaration in 2.0.0, do the same in your implementation now to avoid errors.
+
 ## [1.2.0 - 2023-11-28](https://github.com/Art4/json-api-client/compare/1.1.0...1.2.0)
 
 ### Added
diff --git a/composer.json b/composer.json
index f01bf94..58a139b 100644
--- a/composer.json
+++ b/composer.json
@@ -13,13 +13,13 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0"
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.35",
+        "friendsofphp/php-cs-fixer": "^3.40",
         "phpstan/phpstan": "^1.10",
         "phpstan/phpstan-phpunit": "^1.3",
-        "phpunit/phpunit": "^9 || ^10"
+        "phpunit/phpunit": "^10.4"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Accessable.php b/src/Accessable.php
index 11f3c93..90798ce 100644
--- a/src/Accessable.php
+++ b/src/Accessable.php
@@ -18,22 +18,20 @@ interface Accessable
     /**
      * Get a value by a key
      *
-     * @param mixed $key The key
+     * @return-type-will-change mixed `\Art4\JsonApiClient\Accessable::get()` will add `mixed` as a native return type declaration in 2.0.0, do the same in your implementation now to avoid errors.
      *
      * @return mixed
      */
-    public function get($key);
+    public function get(mixed $key)/*: mixed */;
 
     /**
      * Check if a value exists
      *
      * @return-type-will-change bool `\Art4\JsonApiClient\Accessable::has()` will add `bool` as a native return type declaration in 2.0.0, do the same in your implementation now to avoid errors.
      *
-     * @param mixed $key The key
-     *
      * @return bool
      */
-    public function has($key)/*: bool */;
+    public function has(mixed $key)/*: bool */;
 
     /**
      * Returns the keys of all setted values
diff --git a/src/Element.php b/src/Element.php
index 2951a2e..0bc71ba 100644
--- a/src/Element.php
+++ b/src/Element.php
@@ -18,5 +18,5 @@ interface Element
      *
      * @param mixed $data The data for this Element
      */
-    public function __construct($data, Manager $manager, Accessable $parent);
+    public function __construct(mixed $data, Manager $manager, Accessable $parent);
 }
diff --git a/src/Helper/AbstractElement.php b/src/Helper/AbstractElement.php
index f15a62c..016b25e 100644
--- a/src/Helper/AbstractElement.php
+++ b/src/Helper/AbstractElement.php
@@ -30,7 +30,7 @@ abstract class AbstractElement implements Accessable, Element
      *
      * @param mixed $data The data for this Element
      */
-    public function __construct($data, Manager $manager, Accessable $parent)
+    public function __construct(mixed $data, Manager $manager, Accessable $parent)
     {
         $this->manager = $manager;
         $this->parent = $parent;
@@ -56,10 +56,8 @@ protected function getParent(): Accessable
 
     /**
      * Create an element
-     *
-     * @param mixed $data
      */
-    protected function create(string $name, $data): Accessable
+    protected function create(string $name, mixed $data): Accessable
     {
         return $this->getManager()->getFactory()->make(
             $name,
@@ -69,8 +67,6 @@ protected function create(string $name, $data): Accessable
 
     /**
      * Parse the data
-     *
-     * @param mixed $data
      */
-    abstract protected function parse($data): void;
+    abstract protected function parse(mixed $data): void;
 }
diff --git a/src/Helper/AccessableTrait.php b/src/Helper/AccessableTrait.php
index 6ab503d..6898173 100644
--- a/src/Helper/AccessableTrait.php
+++ b/src/Helper/AccessableTrait.php
@@ -25,10 +25,8 @@ trait AccessableTrait
 
     /**
      * Set a value
-     *
-     * @param mixed  $value The Value
      */
-    final protected function set(string $key, $value): void
+    final protected function set(string $key, mixed $value): void
     {
         // Allow non-associative array for collections
         if ($key === '') {
@@ -93,10 +91,8 @@ final public function has($key): bool
      * Get a value by a key
      *
      * @param int|string|AccessKey<string> $key The key
-     *
-     * @return mixed
      */
-    public function get($key)
+    public function get($key): mixed
     {
         if (!is_int($key) && !is_string($key) && (!is_object($key) || !$key instanceof AccessKey)) {
             trigger_error(sprintf(
@@ -131,10 +127,8 @@ public function get($key)
      * Get a value by the key
      *
      * @throws AccessException
-     *
-     * @return mixed The value
      */
-    private function getValue(string $key)
+    private function getValue(string $key): mixed
     {
         if (array_key_exists($key, $this->data)) {
             return $this->data[$key];
diff --git a/src/Input/StringInputTrait.php b/src/Input/StringInputTrait.php
index f04042c..f620b3e 100644
--- a/src/Input/StringInputTrait.php
+++ b/src/Input/StringInputTrait.php
@@ -41,10 +41,8 @@ final public function prepareString($string): string
      * Decodes a json string
      *
      * @throws InputException if something went wrong with the input
-     *
-     * @return mixed
      */
-    final protected function decodeJson(string $jsonString)
+    final protected function decodeJson(string $jsonString): mixed
     {
         $jsonErrors = [
             \JSON_ERROR_DEPTH => 'JSON_ERROR_DEPTH - Maximum stack depth exceeded',
diff --git a/src/Manager.php b/src/Manager.php
index 0610da0..4f38c72 100644
--- a/src/Manager.php
+++ b/src/Manager.php
@@ -39,9 +39,9 @@ public function getFactory()/*: Factory */;
     /**
      * Get a param by key
      *
-     * @param mixed $default
+     * @return-type-will-change mixed `\Art4\JsonApiClient\Manager::getParam()` will add `mixed` as a native return type declaration in 2.0.0, do the same in your implementation now to avoid errors.
      *
      * @return mixed
      */
-    public function getParam(string $key, $default);
+    public function getParam(string $key, mixed $default)/*: mixed*/;
 }
diff --git a/src/Manager/ErrorAbortManager.php b/src/Manager/ErrorAbortManager.php
index db8567c..5e937c5 100644
--- a/src/Manager/ErrorAbortManager.php
+++ b/src/Manager/ErrorAbortManager.php
@@ -78,12 +78,8 @@ public function getFactory(): Factory
 
     /**
      * Get a param by key
-     *
-     * @param mixed $default
-     *
-     * @return mixed
      */
-    public function getParam(string $key, $default)
+    public function getParam(string $key, mixed $default): mixed
     {
         if (array_key_exists($key, $this->config)) {
             return $this->config[$key];
diff --git a/src/Serializer/ArraySerializer.php b/src/Serializer/ArraySerializer.php
index 14efd00..0744999 100644
--- a/src/Serializer/ArraySerializer.php
+++ b/src/Serializer/ArraySerializer.php
@@ -62,12 +62,8 @@ public function serialize(Accessable $data): ?array
 
     /**
      * Transforms objects to arrays
-     *
-     * @param mixed $val
-     *
-     * @return mixed
      */
-    private function objectTransform($val)
+    private function objectTransform(mixed $val): mixed
     {
         if (!is_object($val)) {
             return $val;
diff --git a/src/V1/Attributes.php b/src/V1/Attributes.php
index b9ae944..f831f03 100644
--- a/src/V1/Attributes.php
+++ b/src/V1/Attributes.php
@@ -23,11 +23,9 @@ final class Attributes extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Attributes has to be an object, "' . gettype($object) . '" given.');
@@ -52,10 +50,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/Document.php b/src/V1/Document.php
index 1717509..531b59f 100644
--- a/src/V1/Document.php
+++ b/src/V1/Document.php
@@ -24,11 +24,9 @@ final class Document extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Document has to be an object, "' . gettype($object) . '" given.');
@@ -75,10 +73,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/DocumentLink.php b/src/V1/DocumentLink.php
index 569c4e5..0d1daab 100644
--- a/src/V1/DocumentLink.php
+++ b/src/V1/DocumentLink.php
@@ -28,11 +28,9 @@ final class DocumentLink extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException(
@@ -105,10 +103,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/Error.php b/src/V1/Error.php
index 250f737..cab0cd0 100644
--- a/src/V1/Error.php
+++ b/src/V1/Error.php
@@ -23,11 +23,9 @@ final class Error extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException(
@@ -107,10 +105,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ErrorCollection.php b/src/V1/ErrorCollection.php
index 39e4766..eccad3f 100644
--- a/src/V1/ErrorCollection.php
+++ b/src/V1/ErrorCollection.php
@@ -23,11 +23,9 @@ final class ErrorCollection extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_array($object)) {
             throw new ValidationException('Errors for a collection has to be in an array, "' . gettype($object) . '" given.');
@@ -46,10 +44,8 @@ protected function parse($object): void
      * Get a value by the key of this document
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ErrorLink.php b/src/V1/ErrorLink.php
index b4f8d2f..fb1ae16 100644
--- a/src/V1/ErrorLink.php
+++ b/src/V1/ErrorLink.php
@@ -27,11 +27,9 @@ final class ErrorLink extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Link has to be an object, "' . gettype($object) . '" given.');
@@ -65,10 +63,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ErrorSource.php b/src/V1/ErrorSource.php
index c9730c3..30bb75f 100644
--- a/src/V1/ErrorSource.php
+++ b/src/V1/ErrorSource.php
@@ -23,11 +23,9 @@ final class ErrorSource extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('ErrorSource has to be an object, "' . gettype($object) . '" given.');
@@ -54,10 +52,8 @@ protected function parse($object): void
      * Get a value by the key of this document
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/Jsonapi.php b/src/V1/Jsonapi.php
index 3e0cf53..7c31c96 100644
--- a/src/V1/Jsonapi.php
+++ b/src/V1/Jsonapi.php
@@ -23,11 +23,9 @@ final class Jsonapi extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Jsonapi has to be an object, "' . gettype($object) . '" given.');
@@ -50,10 +48,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/Link.php b/src/V1/Link.php
index 6a8088e..41bd8eb 100644
--- a/src/V1/Link.php
+++ b/src/V1/Link.php
@@ -23,11 +23,9 @@ final class Link extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Link has to be an object or string, "' . gettype($object) . '" given.');
@@ -46,10 +44,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
@@ -60,10 +56,8 @@ public function get($key)
 
     /**
      * Set a link
-     *
-     * @param mixed $link The Link
      */
-    private function setAsLink(string $name, $link): void
+    private function setAsLink(string $name, mixed $link): void
     {
         if ($name === 'meta') {
             $this->set($name, $this->create('Meta', $link));
diff --git a/src/V1/Meta.php b/src/V1/Meta.php
index 30bce64..ed68e0a 100644
--- a/src/V1/Meta.php
+++ b/src/V1/Meta.php
@@ -23,11 +23,9 @@ final class Meta extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Meta has to be an object, "' . gettype($object) . '" given.');
@@ -48,10 +46,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/Relationship.php b/src/V1/Relationship.php
index b85017d..67444ee 100644
--- a/src/V1/Relationship.php
+++ b/src/V1/Relationship.php
@@ -23,11 +23,9 @@ final class Relationship extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Relationship has to be an object, "' . gettype($object) . '" given.');
@@ -61,10 +59,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/RelationshipCollection.php b/src/V1/RelationshipCollection.php
index e14a6de..8e47d44 100644
--- a/src/V1/RelationshipCollection.php
+++ b/src/V1/RelationshipCollection.php
@@ -23,11 +23,9 @@ final class RelationshipCollection extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Relationships has to be an object, "' . gettype($object) . '" given.');
@@ -56,10 +54,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/RelationshipLink.php b/src/V1/RelationshipLink.php
index 602b13c..e520267 100644
--- a/src/V1/RelationshipLink.php
+++ b/src/V1/RelationshipLink.php
@@ -32,11 +32,9 @@ final class RelationshipLink extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('RelationshipLink has to be an object, "' . gettype($object) . '" given.');
@@ -107,10 +105,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceCollection.php b/src/V1/ResourceCollection.php
index 852ff5d..95a71b5 100644
--- a/src/V1/ResourceCollection.php
+++ b/src/V1/ResourceCollection.php
@@ -24,11 +24,9 @@ final class ResourceCollection extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_array($object)) {
             throw new ValidationException('Resources for a collection has to be in an array, "' . gettype($object) . '" given.');
@@ -49,10 +47,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceIdentifier.php b/src/V1/ResourceIdentifier.php
index 6f6452c..9950667 100644
--- a/src/V1/ResourceIdentifier.php
+++ b/src/V1/ResourceIdentifier.php
@@ -23,11 +23,9 @@ final class ResourceIdentifier extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Resource has to be an object, "' . gettype($object) . '" given.');
@@ -61,10 +59,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceIdentifierCollection.php b/src/V1/ResourceIdentifierCollection.php
index 7c2af51..7b546cd 100644
--- a/src/V1/ResourceIdentifierCollection.php
+++ b/src/V1/ResourceIdentifierCollection.php
@@ -23,11 +23,9 @@ final class ResourceIdentifierCollection extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_array($object)) {
             throw new ValidationException('Resources for a collection has to be in an array, "' . gettype($object) . '" given.');
@@ -44,10 +42,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceItem.php b/src/V1/ResourceItem.php
index 913f701..570a210 100644
--- a/src/V1/ResourceItem.php
+++ b/src/V1/ResourceItem.php
@@ -23,11 +23,9 @@ final class ResourceItem extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('Resource has to be an object, "' . gettype($object) . '" given.');
@@ -79,10 +77,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceItemLink.php b/src/V1/ResourceItemLink.php
index 73964d8..c22a8a8 100644
--- a/src/V1/ResourceItemLink.php
+++ b/src/V1/ResourceItemLink.php
@@ -23,11 +23,9 @@ final class ResourceItemLink extends AbstractElement
     /**
      * Parses the data for this element
      *
-     * @param mixed $object The data
-     *
      * @throws ValidationException
      */
-    protected function parse($object): void
+    protected function parse(mixed $object): void
     {
         if (!is_object($object)) {
             throw new ValidationException('ItemLink has to be an object, "' . gettype($object) . '" given.');
@@ -42,10 +40,8 @@ protected function parse($object): void
      * Get a value by the key of this object
      *
      * @param int|string|AccessKey<string> $key The key of the value
-     *
-     * @return mixed The value
      */
-    public function get($key)
+    public function get($key): mixed
     {
         try {
             return parent::get($key);
diff --git a/src/V1/ResourceNull.php b/src/V1/ResourceNull.php
index 93c71ab..a5f97f5 100644
--- a/src/V1/ResourceNull.php
+++ b/src/V1/ResourceNull.php
@@ -20,13 +20,11 @@
 final class ResourceNull implements Accessable, Element
 {
     /**
-     * Constructor
+     * Sets the manager and parent
      *
-     * @param mixed                          $data    The data for this Element
-     * @param \Art4\JsonApiClient\Manager    $manager The manager
-     * @param \Art4\JsonApiClient\Accessable $parent  The parent
+     * @param mixed $data The data for this Element
      */
-    public function __construct($data, Manager $manager, Accessable $parent) {}
+    public function __construct(mixed $data, Manager $manager, Accessable $parent) {}
 
     /**
      * Check if a value exists in this resource
diff --git a/tests/Fixtures/HelperTrait.php b/tests/Fixtures/HelperTrait.php
index aae051e..8da7143 100644
--- a/tests/Fixtures/HelperTrait.php
+++ b/tests/Fixtures/HelperTrait.php
@@ -176,10 +176,8 @@ public function setUpManagerMock(): void
 
     /**
      * returns a json string from a file
-     *
-     * @param mixed $filename
      */
-    protected function getJsonString($filename): string
+    protected function getJsonString(mixed $filename): string
     {
         return strval(file_get_contents(__DIR__ . '/../files/' . $filename));
     }
diff --git a/tests/Functional/DotNotationTest.php b/tests/Functional/DotNotationTest.php
index bb0a1f2..bb7f598 100644
--- a/tests/Functional/DotNotationTest.php
+++ b/tests/Functional/DotNotationTest.php
@@ -20,9 +20,6 @@ class DotNotationTest extends TestCase
 {
     use HelperTrait;
 
-    /**
-     * @test
-     */
     public function testCompleteResourceObjectWithMultipleRelationships(): void
     {
         $manager = new ErrorAbortManager(new Factory());
@@ -189,9 +186,6 @@ public function testCompleteResourceObjectWithMultipleRelationships(): void
         $this->assertSame('http://example.com/comments/12', $document->get('included.2.links.self'));
     }
 
-    /**
-     * @test
-     */
     public function testGetNotExistentValueThrowsException(): void
     {
         $manager = new ErrorAbortManager(new Factory());
diff --git a/tests/Functional/ErrorParsingTest.php b/tests/Functional/ErrorParsingTest.php
index ce30a29..08d480d 100644
--- a/tests/Functional/ErrorParsingTest.php
+++ b/tests/Functional/ErrorParsingTest.php
@@ -16,9 +16,6 @@ class ErrorParsingTest extends TestCase
 {
     use HelperTrait;
 
-    /**
-     * @test
-     */
     public function testParseErrors(): void
     {
         $string = $this->getJsonString('09_errors.json');
@@ -89,9 +86,6 @@ public function testParseErrors(): void
         $this->assertFalse($errors->has('3'));
     }
 
-    /**
-     * @test
-     */
     public function testParseErrorWithLinks(): void
     {
         $string = $this->getJsonString('10_error_with_links.json');
diff --git a/tests/Functional/ParsingTest.php b/tests/Functional/ParsingTest.php
index 8729849..ac3227f 100644
--- a/tests/Functional/ParsingTest.php
+++ b/tests/Functional/ParsingTest.php
@@ -14,6 +14,7 @@
 use Art4\JsonApiClient\Manager\ErrorAbortManager;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Factory;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ParsingTest extends TestCase
@@ -38,9 +39,7 @@ public static function createParserProvider(): array
         ];
     }
 
-    /**
-     * @dataProvider createParserProvider
-     */
+    #[DataProvider('createParserProvider')]
     public function testParseSimpleResourceWithDifferentParser(callable $parser): void
     {
         $string = $this->getJsonString('01_simple_resource.json');
@@ -67,9 +66,6 @@ public function testParseSimpleResourceWithDifferentParser(callable $parser): vo
         $this->assertInstanceOf('Art4\JsonApiClient\V1\RelationshipCollection', $resource->get('relationships'));
     }
 
-    /**
-     * @test
-     */
     public function testParseSimpleResourceIdentifier(): void
     {
         $string = $this->getJsonString('02_simple_resource_identifier.json');
@@ -91,9 +87,6 @@ public function testParseSimpleResourceIdentifier(): void
         $this->assertSame($resource->get('id'), '1');
     }
 
-    /**
-     * @test
-     */
     public function testParseResourceObject(): void
     {
         $string = $this->getJsonString('03_resource_object.json');
@@ -159,9 +152,6 @@ public function testParseResourceObject(): void
         $this->assertSame($data->get('id'), '9');
     }
 
-    /**
-     * @test
-     */
     public function testParseCompleteResourceObjectWithMultipleRelationships(): void
     {
         $string = $this->getJsonString('04_complete_document_with_multiple_relationships.json');
@@ -355,9 +345,6 @@ public function testParseCompleteResourceObjectWithMultipleRelationships(): void
         $this->assertSame($links->get('self'), 'http://example.com/comments/12');
     }
 
-    /**
-     * @test
-     */
     public function testParsePaginationExample(): void
     {
         $string = $this->getJsonString('06_pagination_example.json');
@@ -409,9 +396,6 @@ public function testParsePaginationExample(): void
         $this->assertSame($links->get('last'), 'http://example.com/articles?page[number]=13&page[size]=1');
     }
 
-    /**
-     * @test
-     */
     public function testParseRelationshipExample(): void
     {
         $string = $this->getJsonString('07_relationship_example_without_data.json');
@@ -475,9 +459,6 @@ public function testParseRelationshipExample(): void
         $this->assertSame($document->get('data.0.relationships.comments.links.related.meta.count'), 10);
     }
 
-    /**
-     * @test
-     */
     public function testParseObjectLinksExample(): void
     {
         $string = $this->getJsonString('08_object_links.json');
@@ -518,9 +499,6 @@ public function testParseObjectLinksExample(): void
         $this->assertSame('bar', $document->get('jsonapi.meta.foo'));
     }
 
-    /**
-     * @test
-     */
     public function testParseResourceIdentifierWithMeta(): void
     {
         $string = $this->getJsonString('11_resource_identifier_with_meta.json');
@@ -544,9 +522,6 @@ public function testParseResourceIdentifierWithMeta(): void
         $this->assertSame($resource->get('id'), '2');
     }
 
-    /**
-     * @test
-     */
     public function testParseNullResource(): void
     {
         $string = $this->getJsonString('12_null_resource.json');
@@ -565,9 +540,6 @@ public function testParseNullResource(): void
         $this->assertInstanceOf('Art4\JsonApiClient\V1\ResourceNull', $resource);
     }
 
-    /**
-     * @test
-     */
     public function testParseResourceIdentifierCollectionWithMeta(): void
     {
         $string = $this->getJsonString('13_collection_with_resource_identifier_with_meta.json');
@@ -602,9 +574,6 @@ public function testParseResourceIdentifierCollectionWithMeta(): void
         $this->assertSame($resource1->get('id'), '2');
     }
 
-    /**
-     * @test
-     */
     public function testParseCreateResourceWithoutId(): void
     {
         $string = $this->getJsonString('14_create_resource_without_id.json');
@@ -614,9 +583,6 @@ public function testParseCreateResourceWithoutId(): void
         $this->assertSame(['data'], $document->getKeys());
     }
 
-    /**
-     * @test
-     */
     public function testParseCreateShortResourceWithoutId(): void
     {
         $string = $this->getJsonString('15_create_resource_without_id.json');
@@ -626,9 +592,6 @@ public function testParseCreateShortResourceWithoutId(): void
         $this->assertSame(['data'], $document->getKeys());
     }
 
-    /**
-     * @test
-     */
     public function testExceptionIfIdIsNotString(): void
     {
         $this->expectException(\Art4\JsonApiClient\Exception\ValidationException::class);
@@ -636,9 +599,6 @@ public function testExceptionIfIdIsNotString(): void
         $document = Parser::parseResponseString($string);
     }
 
-    /**
-     * @test
-     */
     public function testParseLinksInRelationshipsCorrectly(): void
     {
         $string = $this->getJsonString('17_relationship_links.json');
diff --git a/tests/Functional/SerializerTest.php b/tests/Functional/SerializerTest.php
index 1838e87..71d9fa7 100644
--- a/tests/Functional/SerializerTest.php
+++ b/tests/Functional/SerializerTest.php
@@ -15,6 +15,7 @@
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Factory;
 use Exception;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class SerializerTest extends TestCase
@@ -61,9 +62,7 @@ public static function jsonapiDataProvider(): array
         return $files;
     }
 
-    /**
-     * @dataProvider jsonapiDataProvider
-     */
+    #[DataProvider('jsonapiDataProvider')]
     public function testParseJsonapiDataWithErrorAbortManager(string $filename, bool $isRequest): void
     {
         $manager = new ErrorAbortManager(new Factory());
diff --git a/tests/Unit/Helper/AccessableTraitTest.php b/tests/Unit/Helper/AccessableTraitTest.php
index f52ef81..eca0494 100644
--- a/tests/Unit/Helper/AccessableTraitTest.php
+++ b/tests/Unit/Helper/AccessableTraitTest.php
@@ -11,18 +11,15 @@
 use Art4\JsonApiClient\Exception\AccessException;
 use Art4\JsonApiClient\Tests\Fixtures\AccessableTraitMock;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class AccessableTraitTest extends TestCase
 {
     use HelperTrait;
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutStringAndInt
-     *
-     * @param mixed $key
-     */
-    public function testHasWithInvalidKeyTypeTriggersDeprecationError($key): void
+    #[DataProvider('jsonValuesProviderWithoutStringAndInt')]
+    public function testHasWithInvalidKeyTypeTriggersDeprecationError(mixed $key): void
     {
         $resource = new AccessableTraitMock();
 
@@ -43,12 +40,8 @@ function ($errno, $errstr) use ($key): bool {
         $resource->has($key);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutStringAndInt
-     *
-     * @param mixed $key
-     */
-    public function testGetWithInvalidKeyTypeTriggersDeprecationError($key): void
+    #[DataProvider('jsonValuesProviderWithoutStringAndInt')]
+    public function testGetWithInvalidKeyTypeTriggersDeprecationError(mixed $key): void
     {
         $resource = new AccessableTraitMock();
 
diff --git a/tests/Unit/Input/RequestStringInputTest.php b/tests/Unit/Input/RequestStringInputTest.php
index f9d49e7..bfa259b 100644
--- a/tests/Unit/Input/RequestStringInputTest.php
+++ b/tests/Unit/Input/RequestStringInputTest.php
@@ -11,6 +11,7 @@
 use Art4\JsonApiClient\Exception\InputException;
 use Art4\JsonApiClient\Input\RequestStringInput;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class RequestStringInputTest extends TestCase
@@ -24,12 +25,8 @@ public function testGetAsObjectFromStringReturnsObject(): void
         $this->assertInstanceOf(\stdClass::class, $input->getAsObject());
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateWithoutStringThrowsException(mixed $input): void
     {
         $this->expectException(InputException::class);
         $this->expectExceptionMessage(
@@ -38,9 +35,7 @@ public function testCreateWithoutStringThrowsException($input): void
         new RequestStringInput($input);
     }
 
-    /**
-     * @dataProvider jsonValuesAsStringProviderWithoutObject
-     */
+    #[DataProvider('jsonValuesAsStringProviderWithoutObject')]
     public function testGetAsObjectWithInvalidStringsThrowsException(string $input): void
     {
         $input = new RequestStringInput($input);
diff --git a/tests/Unit/Input/ResponseStringInputTest.php b/tests/Unit/Input/ResponseStringInputTest.php
index 8b6f24c..7d1f6aa 100644
--- a/tests/Unit/Input/ResponseStringInputTest.php
+++ b/tests/Unit/Input/ResponseStringInputTest.php
@@ -11,6 +11,7 @@
 use Art4\JsonApiClient\Exception\InputException;
 use Art4\JsonApiClient\Input\ResponseStringInput;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResponseStringInputTest extends TestCase
@@ -24,12 +25,8 @@ public function testGetAsObjectFromStringReturnsObject(): void
         $this->assertInstanceOf(\stdClass::class, $input->getAsObject());
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateWithoutStringThrowsException(mixed $input): void
     {
         $this->expectException(InputException::class);
         $this->expectExceptionMessage(
@@ -38,9 +35,7 @@ public function testCreateWithoutStringThrowsException($input): void
         new ResponseStringInput($input);
     }
 
-    /**
-     * @dataProvider jsonValuesAsStringProviderWithoutObject
-     */
+    #[DataProvider('jsonValuesAsStringProviderWithoutObject')]
     public function testGetAsObjectWithInvalidStringsThrowsException(string $input): void
     {
         $input = new ResponseStringInput($input);
diff --git a/tests/Unit/Manager/ErrorAbortManagerTest.php b/tests/Unit/Manager/ErrorAbortManagerTest.php
index 9cae683..653bfc6 100644
--- a/tests/Unit/Manager/ErrorAbortManagerTest.php
+++ b/tests/Unit/Manager/ErrorAbortManagerTest.php
@@ -14,9 +14,6 @@
 
 class ErrorAbortManagerTest extends TestCase
 {
-    /**
-     * @test
-     */
     public function testCreateWithConstructorReturnsSelf(): void
     {
         $factory = $this->createMock(Factory::class);
@@ -25,9 +22,6 @@ public function testCreateWithConstructorReturnsSelf(): void
         $this->assertSame($factory, $manager->getFactory());
     }
 
-    /**
-     * @test
-     */
     public function testGetParamReturnsDefault(): void
     {
         $factory = $this->createMock(Factory::class);
diff --git a/tests/Unit/V1/AttributesTest.php b/tests/Unit/V1/AttributesTest.php
index 865197c..e19a201 100644
--- a/tests/Unit/V1/AttributesTest.php
+++ b/tests/Unit/V1/AttributesTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Attributes;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class AttributesTest extends TestCase
@@ -80,12 +81,8 @@ public function testCreateWithObject(): void
         ], $attributes->getKeys());
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithDataProvider($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataProvider(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -188,9 +185,6 @@ public function testCreateWithLinksPropertyThrowsException(): void
         );
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/DocumentLinkTest.php b/tests/Unit/V1/DocumentLinkTest.php
index 6227032..da58837 100644
--- a/tests/Unit/V1/DocumentLinkTest.php
+++ b/tests/Unit/V1/DocumentLinkTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\DocumentLink;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class DocumentLinkTest extends TestCase
@@ -89,13 +90,10 @@ public function testOnlySelfRelatedPaginationPropertiesExists(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * links: a links object related to the primary data.
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -106,13 +104,10 @@ public function testCreateWithoutObjectThrowsException($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * test create without object or string attribute throws exception
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectOrStringAttributeThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testCreateWithoutObjectOrStringAttributeThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'http://example.org/self';
@@ -127,13 +122,10 @@ public function testCreateWithoutObjectOrStringAttributeThrowsException($input):
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * self: the link that generated the current response document.
-     *
-     * @param mixed $input
      */
-    public function testSelfMustBeAStringOrObject($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testSelfMustBeAStringOrObject(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = $input;
@@ -147,8 +139,6 @@ public function testSelfMustBeAStringOrObject($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * related: a related resource link when the primary data represents a resource relationship.
      * If present, a related resource link MUST reference a valid URL
      *
@@ -162,10 +152,9 @@ public function testSelfMustBeAStringOrObject($input): void
      *     }
      *   }
      * }
-     *
-     * @param mixed $input
      */
-    public function testRelatedMustBeAStringOrObject($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testRelatedMustBeAStringOrObject(mixed $input): void
     {
         $object = new \stdClass();
         $object->related = $input;
@@ -179,13 +168,10 @@ public function testRelatedMustBeAStringOrObject($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testFirstCanBeAnObjectOrStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testFirstCanBeAnObjectOrStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -229,13 +215,10 @@ public function testFirstCanBeAnObjectOrStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testLastCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testLastCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -279,13 +262,10 @@ public function testLastCanBeAStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testPrevCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testPrevCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -329,13 +309,10 @@ public function testPrevCanBeAStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testNextCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testNextCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -378,9 +355,6 @@ public function testNextCanBeAStringOrNull($input): void
         $link = new DocumentLink($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/DocumentTest.php b/tests/Unit/V1/DocumentTest.php
index 5a8e949..d62ef94 100644
--- a/tests/Unit/V1/DocumentTest.php
+++ b/tests/Unit/V1/DocumentTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Document;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class DocumentTest extends TestCase
@@ -85,13 +86,10 @@ public function testCreateWithAllPossibleValues(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * A JSON object MUST be at the root of every JSON API request and response containing data.
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataproviderThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataproviderThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -229,13 +227,10 @@ public function testCreateDataWithResourceCollectionResources(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * Test create with any value in data
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataproviderInValue($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataproviderInValue(mixed $input): void
     {
 
         // Test with empty array in data
@@ -413,9 +408,6 @@ public function testCreateIncludedWithoutDataThrowsException(): void
         $document = new Document($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/ErrorCollectionTest.php b/tests/Unit/V1/ErrorCollectionTest.php
index e6fc4a1..00db6b0 100644
--- a/tests/Unit/V1/ErrorCollectionTest.php
+++ b/tests/Unit/V1/ErrorCollectionTest.php
@@ -14,6 +14,7 @@
 use Art4\JsonApiClient\Helper\AccessKey;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ErrorCollection;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ErrorCollectionTest extends TestCase
@@ -63,12 +64,8 @@ public function testCreate(): void
         $this->assertInstanceOf(Accessable::class, $error);
     }
 
-    /**
-     * @dataProvider jsonValuesProvider
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutArrayThrowsException($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testCreateWithoutArrayThrowsException(mixed $input): void
     {
         // Input must be an array with at least one object
         if (gettype($input) === 'array') {
diff --git a/tests/Unit/V1/ErrorLinkTest.php b/tests/Unit/V1/ErrorLinkTest.php
index 7b66639..3a4dfe0 100644
--- a/tests/Unit/V1/ErrorLinkTest.php
+++ b/tests/Unit/V1/ErrorLinkTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ErrorLink;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ErrorLinkTest extends TestCase
@@ -100,13 +101,10 @@ public function testAboutCanBeAnObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * The value of each links member MUST be an object (a "links object").
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataprovider($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataprovider(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -117,13 +115,10 @@ public function testCreateWithDataprovider($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * test create without object or string attribute throws exception
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectOrStringAttributeThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testCreateWithoutObjectOrStringAttributeThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->about = 'http://example.org/about';
@@ -138,13 +133,10 @@ public function testCreateWithoutObjectOrStringAttributeThrowsException($input):
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * The value of the about member MUST be an object (a "links object") or a string.
-     *
-     * @param mixed $input
      */
-    public function testAboutWithDataproviderThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testAboutWithDataproviderThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->about = $input;
@@ -157,9 +149,6 @@ public function testAboutWithDataproviderThrowsException($input): void
         $link = new ErrorLink($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/ErrorSourceTest.php b/tests/Unit/V1/ErrorSourceTest.php
index 553a99e..f6cab45 100644
--- a/tests/Unit/V1/ErrorSourceTest.php
+++ b/tests/Unit/V1/ErrorSourceTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ErrorSource;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ErrorSourceTest extends TestCase
@@ -68,13 +69,10 @@ public function testOnlyPointerParameterPropertiesExists(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * source: an object containing references to ...
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -85,13 +83,10 @@ public function testCreateWithoutObjectThrowsException($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * pointer: a JSON Pointer [RFC6901] to the associated entity in the request document [e.g. "/data" for a primary data object, or "/data/attributes/title" for a specific attribute].
-     *
-     * @param mixed $input
      */
-    public function testPointerMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testPointerMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->pointer = $input;
@@ -105,13 +100,10 @@ public function testPointerMustBeAString($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * parameter: a string indicating which query parameter caused the error.
-     *
-     * @param mixed $input
      */
-    public function testParameterMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testParameterMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->parameter = $input;
diff --git a/tests/Unit/V1/ErrorTest.php b/tests/Unit/V1/ErrorTest.php
index a777c85..c3c9b22 100644
--- a/tests/Unit/V1/ErrorTest.php
+++ b/tests/Unit/V1/ErrorTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Error;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ErrorTest extends TestCase
@@ -80,12 +81,8 @@ public function testCreateWithObjectReturnsSelf(): void
         $error->get('something');
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -95,12 +92,8 @@ public function testCreateWithoutObjectThrowsException($input): void
         $error = new Error($input, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateIdWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateIdWithoutStringThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->id = $input;
@@ -113,12 +106,8 @@ public function testCreateIdWithoutStringThrowsException($input): void
         $error = new Error($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateStatusWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateStatusWithoutStringThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->status = $input;
@@ -131,12 +120,8 @@ public function testCreateStatusWithoutStringThrowsException($input): void
         $error = new Error($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateCodeWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateCodeWithoutStringThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->code = $input;
@@ -149,12 +134,8 @@ public function testCreateCodeWithoutStringThrowsException($input): void
         $error = new Error($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateTitleWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateTitleWithoutStringThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->title = $input;
@@ -167,12 +148,8 @@ public function testCreateTitleWithoutStringThrowsException($input): void
         $error = new Error($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
-     * @param mixed $input
-     */
-    public function testCreateDetailWithoutStringThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testCreateDetailWithoutStringThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->detail = $input;
diff --git a/tests/Unit/V1/FactoryTest.php b/tests/Unit/V1/FactoryTest.php
index ea2b356..1294809 100644
--- a/tests/Unit/V1/FactoryTest.php
+++ b/tests/Unit/V1/FactoryTest.php
@@ -19,9 +19,6 @@
 
 class FactoryTest extends TestCase
 {
-    /**
-     * @test
-     */
     public function testInjectACustomClass(): void
     {
         $factory = new Factory([
diff --git a/tests/Unit/V1/JsonapiTest.php b/tests/Unit/V1/JsonapiTest.php
index ccbeb0a..6e26e38 100644
--- a/tests/Unit/V1/JsonapiTest.php
+++ b/tests/Unit/V1/JsonapiTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Jsonapi;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class JsonapiTest extends TestCase
@@ -70,13 +71,10 @@ public function testCreateWithObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * If present, the value of the jsonapi member MUST be an object (a "jsonapi object").
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataprovider($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataprovider(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -87,13 +85,10 @@ public function testCreateWithDataprovider($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * The jsonapi object MAY contain a version member whose value is a string
-     *
-     * @param mixed $input
      */
-    public function testVersionCannotBeAnObjectOrArray($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testVersionCannotBeAnObjectOrArray(mixed $input): void
     {
         $object = new \stdClass();
         $object->version = $input;
diff --git a/tests/Unit/V1/LinkTest.php b/tests/Unit/V1/LinkTest.php
index e62d237..39442ac 100644
--- a/tests/Unit/V1/LinkTest.php
+++ b/tests/Unit/V1/LinkTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Link;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class LinkTest extends TestCase
@@ -63,14 +64,11 @@ public function testCreateWithObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * - an object ("link object") which can contain the following members:
      *   - href: a string containing the link's URL.
-     *
-     * @param mixed $input
      */
-    public function testHrefHasToBeAString($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testHrefHasToBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->href = $input;
@@ -127,13 +125,10 @@ public function testMetaIsParsedAsObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * The value of each links member MUST be an object (a "links object").
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataprovider($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataprovider(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/MetaTest.php b/tests/Unit/V1/MetaTest.php
index 218ed5f..defdb04 100644
--- a/tests/Unit/V1/MetaTest.php
+++ b/tests/Unit/V1/MetaTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Meta;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class MetaTest extends TestCase
@@ -76,13 +77,10 @@ public function testCreateWithObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * The value of each meta member MUST be an object (a "meta object").
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage('Meta has to be an object, "' . gettype($input) . '" given.');
diff --git a/tests/Unit/V1/RelationshipCollectionTest.php b/tests/Unit/V1/RelationshipCollectionTest.php
index fa6ef95..9982184 100644
--- a/tests/Unit/V1/RelationshipCollectionTest.php
+++ b/tests/Unit/V1/RelationshipCollectionTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\RelationshipCollection;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class RelationshipCollectionTest extends TestCase
@@ -158,12 +159,8 @@ public function testCreateWithAuthorInRelationshipsAndAttributesThrowsException(
         $collection = new RelationshipCollection($object, $this->manager, $item);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/RelationshipLinkTest.php b/tests/Unit/V1/RelationshipLinkTest.php
index 475e080..2962623 100644
--- a/tests/Unit/V1/RelationshipLinkTest.php
+++ b/tests/Unit/V1/RelationshipLinkTest.php
@@ -14,6 +14,7 @@
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceIdentifierCollection;
 use Art4\JsonApiClient\V1\RelationshipLink;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class RelationshipLinkTest extends TestCase
@@ -200,13 +201,10 @@ public function testPaginationNotParsedIfRelationshipIdentifierCollectionNotExis
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * links: a links object containing at least one of the following:
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -217,13 +215,10 @@ public function testCreateWithoutObjectThrowsException($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * test create without object or string attribute throws exception
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectOrStringAttributeThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testCreateWithoutObjectOrStringAttributeThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'http://example.org/self';
@@ -255,13 +250,10 @@ public function testCreateWithoutSelfAndRelatedPropertiesThrowsException(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * self: a link for the relationship itself (a "relationship link").
-     *
-     * @param mixed $input
      */
-    public function testSelfMustBeAStringOrObject($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testSelfMustBeAStringOrObject(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = $input;
@@ -275,14 +267,11 @@ public function testSelfMustBeAStringOrObject($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * related: a related resource link when the primary data represents a resource relationship.
      * If present, a related resource link MUST reference a valid URL
-     *
-     * @param mixed $input
      */
-    public function testRelatedMustBeAStringOrObject($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testRelatedMustBeAStringOrObject(mixed $input): void
     {
         $object = new \stdClass();
         $object->related = $input;
@@ -296,13 +285,10 @@ public function testRelatedMustBeAStringOrObject($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testFirstCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testFirstCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -337,13 +323,10 @@ public function testFirstCanBeAStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testLastCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testLastCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -378,13 +361,10 @@ public function testLastCanBeAStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testPrevCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testPrevCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -419,13 +399,10 @@ public function testPrevCanBeAStringOrNull($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProvider
-     *
      * Keys MUST either be omitted or have a null value to indicate that a particular link is unavailable.
-     *
-     * @param mixed $input
      */
-    public function testNextCanBeAStringOrNull($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testNextCanBeAStringOrNull(mixed $input): void
     {
         $object = new \stdClass();
         $object->self = 'https://example.org/self';
@@ -459,9 +436,6 @@ public function testNextCanBeAStringOrNull($input): void
         $link = new RelationshipLink($object, $this->manager, $this->relationship);
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/RelationshipTest.php b/tests/Unit/V1/RelationshipTest.php
index 7574890..3a28544 100644
--- a/tests/Unit/V1/RelationshipTest.php
+++ b/tests/Unit/V1/RelationshipTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\Relationship;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class RelationshipTest extends TestCase
@@ -59,13 +60,10 @@ public function testCreateWithObjectReturnsSelf(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * The value of the relationships key MUST be an object (a "relationships object").
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/ResourceCollectionTest.php b/tests/Unit/V1/ResourceCollectionTest.php
index 9955a9d..30cd6f8 100644
--- a/tests/Unit/V1/ResourceCollectionTest.php
+++ b/tests/Unit/V1/ResourceCollectionTest.php
@@ -14,6 +14,7 @@
 use Art4\JsonApiClient\Helper\AccessKey;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceCollection;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceCollectionTest extends TestCase
@@ -133,12 +134,8 @@ public function testCreateWithItem(): void
         $this->assertInstanceOf(Accessable::class, $resource);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutArray
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutArrayThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutArray')]
+    public function testCreateWithoutArrayThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -148,12 +145,8 @@ public function testCreateWithoutArrayThrowsException($input): void
         $collection = new ResourceCollection($input, $this->manager, $this->parent);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutObjectInArrayThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectInArrayThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/ResourceIdentifierCollectionTest.php b/tests/Unit/V1/ResourceIdentifierCollectionTest.php
index 3ab6f02..805537a 100644
--- a/tests/Unit/V1/ResourceIdentifierCollectionTest.php
+++ b/tests/Unit/V1/ResourceIdentifierCollectionTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceIdentifierCollection;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceIdentifierCollectionTest extends TestCase
@@ -95,12 +96,8 @@ public function testCreateWithItem(): void
         $this->assertInstanceOf(Accessable::class, $resource);
     }
 
-    /**
-     * @dataProvider jsonValuesProviderWithoutArray
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithoutArrayThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutArray')]
+    public function testCreateWithoutArrayThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/ResourceIdentifierTest.php b/tests/Unit/V1/ResourceIdentifierTest.php
index 65e4ff5..c0867f7 100644
--- a/tests/Unit/V1/ResourceIdentifierTest.php
+++ b/tests/Unit/V1/ResourceIdentifierTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceIdentifier;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceIdentifierTest extends TestCase
@@ -72,13 +73,10 @@ public function testCreateWithObjectAndMeta(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * The values of the id and type members MUST be strings.
-     *
-     * @param mixed $input
      */
-    public function testTypeMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testTypeMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->type = $input;
@@ -95,13 +93,10 @@ public function testTypeMustBeAString($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * The values of the id and type members MUST be strings.
-     *
-     * @param mixed $input
      */
-    public function testIdMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testIdMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->type = 'posts';
@@ -116,14 +111,11 @@ public function testIdMustBeAString($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * A "resource identifier object" is an object that identifies an individual resource.
      * A "resource identifier object" MUST contain type and id members.
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataproviderThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataproviderThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/ResourceItemLinkTest.php b/tests/Unit/V1/ResourceItemLinkTest.php
index 1d98f6f..c45b83c 100644
--- a/tests/Unit/V1/ResourceItemLinkTest.php
+++ b/tests/Unit/V1/ResourceItemLinkTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceItemLink;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceItemLinkTest extends TestCase
@@ -55,13 +56,10 @@ public function testParsingPropertiesExists(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * links: a links object related to the primary data.
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithoutObjectThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
@@ -72,13 +70,10 @@ public function testCreateWithoutObjectThrowsException($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObjectAndString
-     *
      * test create without object or string attribute throws exception
-     *
-     * @param mixed $input
      */
-    public function testCreateWithoutObjectOrStringAttributeThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObjectAndString')]
+    public function testCreateWithoutObjectOrStringAttributeThrowsException(mixed $input): void
     {
         $object = new \stdClass();
         $object->input = $input;
@@ -91,9 +86,6 @@ public function testCreateWithoutObjectOrStringAttributeThrowsException($input):
         $link = new ResourceItemLink($object, $this->manager, $this->parent);
     }
 
-    /**
-     * @test
-     */
     public function testGetOnANonExistingKeyThrowsException(): void
     {
         $object = new \stdClass();
diff --git a/tests/Unit/V1/ResourceItemTest.php b/tests/Unit/V1/ResourceItemTest.php
index 8641760..44030be 100644
--- a/tests/Unit/V1/ResourceItemTest.php
+++ b/tests/Unit/V1/ResourceItemTest.php
@@ -13,6 +13,7 @@
 use Art4\JsonApiClient\Exception\ValidationException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceItem;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceItemTest extends TestCase
@@ -96,13 +97,10 @@ public function testCreateWithFullObject(): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * The values of the id and type members MUST be strings.
-     *
-     * @param mixed $input
      */
-    public function testTypeMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testTypeMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->type = $input;
@@ -117,13 +115,10 @@ public function testTypeMustBeAString($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutString
-     *
      * The values of the id and type members MUST be strings.
-     *
-     * @param mixed $input
      */
-    public function testIdMustBeAString($input): void
+    #[DataProvider('jsonValuesProviderWithoutString')]
+    public function testIdMustBeAString(mixed $input): void
     {
         $object = new \stdClass();
         $object->type = 'posts';
@@ -138,14 +133,11 @@ public function testIdMustBeAString($input): void
     }
 
     /**
-     * @dataProvider jsonValuesProviderWithoutObject
-     *
      * A "resource object" is an object that identifies an individual resource.
      * A "resource object" MUST contain type and id members.
-     *
-     * @param mixed $input
      */
-    public function testCreateWithDataproviderThrowsException($input): void
+    #[DataProvider('jsonValuesProviderWithoutObject')]
+    public function testCreateWithDataproviderThrowsException(mixed $input): void
     {
         $this->expectException(ValidationException::class);
         $this->expectExceptionMessage(
diff --git a/tests/Unit/V1/ResourceNullTest.php b/tests/Unit/V1/ResourceNullTest.php
index b476e3d..e350356 100644
--- a/tests/Unit/V1/ResourceNullTest.php
+++ b/tests/Unit/V1/ResourceNullTest.php
@@ -12,6 +12,7 @@
 use Art4\JsonApiClient\Exception\AccessException;
 use Art4\JsonApiClient\Tests\Fixtures\HelperTrait;
 use Art4\JsonApiClient\V1\ResourceNull;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ResourceNullTest extends TestCase
@@ -29,12 +30,8 @@ public function setUp(): void
         $this->parent = $this->createMock(Accessable::class);
     }
 
-    /**
-     * @dataProvider jsonValuesProvider
-     *
-     * @param mixed $input
-     */
-    public function testCreateWithDataProvider($input): void
+    #[DataProvider('jsonValuesProvider')]
+    public function testCreateWithDataProvider(mixed $input): void
     {
         $resource = new ResourceNull(
             $input,