diff --git a/.php_cs b/.php-cs-fixer.php
similarity index 80%
rename from .php_cs
rename to .php-cs-fixer.php
index d67e700..a519879 100644
--- a/.php_cs
+++ b/.php-cs-fixer.php
@@ -3,8 +3,9 @@
 $finder = PhpCsFixer\Finder::create()
     ->in(__DIR__ . "/src")
     ->in(__DIR__ . "/tests");
+$config = new PhpCsFixer\Config();
 
-return PhpCsFixer\Config::create()
+return $config
     ->setRules([
         '@PSR2' => true,
         '@Symfony' => true,
diff --git a/composer.json b/composer.json
index 8e0ba2a..ca80da4 100644
--- a/composer.json
+++ b/composer.json
@@ -20,16 +20,17 @@
         }
     },
     "require": {
-        "php": ">=7.1",
+        "php": ">=8.1",
         "paragonie/random_compat": "^1.0|^2.0|9.99.99",
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^1.0",
+        "nyholm/psr7": "^1.5"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2",
+        "friendsofphp/php-cs-fixer": "^v3.13.0",
         "guzzlehttp/psr7": "^1.2",
-        "phpunit/phpunit": "~7.0",
-        "symfony/http-foundation": "~2.8|~3.0",
-        "symfony/psr-http-message-bridge": "^1.0.2",
-        "zendframework/zend-diactoros": "^1.1"
+        "phpunit/phpunit": "^9.5.26",
+        "symfony/http-foundation": "^v6.1.8",
+        "symfony/psr-http-message-bridge": "^v2.1.3",
+        "laminas/laminas-diactoros": "^2.22.0"
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 2b6ab58..119018c 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,26 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         beStrictAboutTestsThatDoNotTestAnything="true"
-         beStrictAboutOutputDuringTests="true"
-         bootstrap="vendor/autoload.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnError="false"
-         stopOnFailure="false"
-         verbose="true"
->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false" beStrictAboutTestsThatDoNotTestAnything="true" beStrictAboutOutputDuringTests="true" bootstrap="vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnError="false" stopOnFailure="false" verbose="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
   <testsuites>
     <testsuite name="HTTP Signatures Test Suite">
       <directory suffix="Test.php">./tests</directory>
     </testsuite>
   </testsuites>
-  <filter>
-    <whitelist processUncoveredFilesFromWhitelist="true">
-      <directory suffix=".php">./src</directory>
-    </whitelist>
-  </filter>
 </phpunit>
diff --git a/tests/ContextTest.php b/tests/ContextTest.php
index e6e22dc..391c8bd 100644
--- a/tests/ContextTest.php
+++ b/tests/ContextTest.php
@@ -8,7 +8,7 @@
 
 class ContextTest extends TestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->noDigestContext = new Context([
             'keys' => ['pda' => 'secret'],
diff --git a/tests/KeyStoreTest.php b/tests/KeyStoreTest.php
index 8e578eb..3c9032c 100644
--- a/tests/KeyStoreTest.php
+++ b/tests/KeyStoreTest.php
@@ -15,11 +15,9 @@ public function testFetchSuccess()
         $this->assertEquals('secret', $key->secret);
     }
 
-    /**
-     * @expectedException \HttpSignatures\Exception
-     */
     public function testFetchFail()
     {
+        $this->expectException(\HttpSignatures\Exception::class);
         $ks = new KeyStore(['id' => 'secret']);
         $key = $ks->fetch('nope');
     }
diff --git a/tests/SignatureParametersParserTest.php b/tests/SignatureParametersParserTest.php
index 1e300c7..9a28147 100644
--- a/tests/SignatureParametersParserTest.php
+++ b/tests/SignatureParametersParserTest.php
@@ -23,20 +23,16 @@ public function testParseReturnsExpectedAssociativeArray()
         );
     }
 
-    /**
-     * @expectedException \HttpSignatures\SignatureParseException
-     */
     public function testParseThrowsTypedException()
     {
+        $this->expectException(\HttpSignatures\SignatureParseException::class);
         $parser = new SignatureParametersParser('nope');
         $parser->parse();
     }
 
-    /**
-     * @expectedException \HttpSignatures\SignatureParseException
-     */
     public function testParseExceptionForMissingComponents()
     {
+        $this->expectException(\HttpSignatures\SignatureParseException::class);
         $parser = new SignatureParametersParser(
             'keyId="example",algorithm="hmac-sha1",headers="(request-target) date"'
         );
diff --git a/tests/SigningStringTest.php b/tests/SigningStringTest.php
index d072b52..36d3abd 100644
--- a/tests/SigningStringTest.php
+++ b/tests/SigningStringTest.php
@@ -4,8 +4,9 @@
 
 use GuzzleHttp\Psr7\Request;
 use HttpSignatures\HeaderList;
-use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
 use HttpSignatures\SigningString;
+use Nyholm\Psr7\Factory\Psr17Factory;
+use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
 use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
 use PHPUnit\Framework\TestCase;
 
@@ -66,11 +67,9 @@ public function testSigningStringWithUnorderedQueryParametersSymfonyRequest()
         );
     }
 
-    /**
-     * @expectedException \HttpSignatures\Exception
-     */
     public function testSigningStringErrorForMissingHeader()
     {
+        $this->expectException(\HttpSignatures\Exception::class);
         $headerList = new HeaderList(['nope']);
         $ss = new SigningString($headerList, $this->message('/'));
         $ss->string();
@@ -85,10 +84,8 @@ private function symfonyMessage($path)
     {
         $symfonyRequest = SymfonyRequest::create($path, 'GET');
         $symfonyRequest->headers->replace(['date' => 'Mon, 28 Jul 2014 15:39:13 -0700']);
-
-        $psr7Factory = new DiactorosFactory();
-        $psrRequest = $psr7Factory->createRequest($symfonyRequest)->withRequestTarget($symfonyRequest->getRequestUri());
-
-        return $psrRequest;
+        $psr17Factory = new Psr17Factory;
+        $psr7Factory = new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
+        return $psr7Factory->createRequest($symfonyRequest)->withRequestTarget($symfonyRequest->getRequestUri());
     }
 }
diff --git a/tests/VerifierTest.php b/tests/VerifierTest.php
index c800ad8..5ea45d8 100644
--- a/tests/VerifierTest.php
+++ b/tests/VerifierTest.php
@@ -22,7 +22,7 @@ class VerifierTest extends TestCase
      */
     private $message;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->setUpVerifier();
         $this->setUpValidMessage();