diff --git a/src/Redis.php b/src/Redis.php
index 3b611bc..c5be1bc 100644
--- a/src/Redis.php
+++ b/src/Redis.php
@@ -5,6 +5,7 @@
 namespace Laminas\Cache\Storage\Adapter;
 
 use Laminas\Cache\Exception;
+use Laminas\Cache\Storage\Adapter\RedisResourceManager;
 use Laminas\Cache\Storage\Capabilities;
 use Laminas\Cache\Storage\ClearByNamespaceInterface;
 use Laminas\Cache\Storage\ClearByPrefixInterface;
@@ -27,31 +28,23 @@ final class Redis extends AbstractAdapter implements
 {
     /**
      * Has this instance be initialized
-     *
-     * @var bool
      */
-    protected $initialized = false;
+    private bool $initialized = false;
 
     /**
      * The redis resource manager
-     *
-     * @var null|RedisResourceManager
      */
-    protected $resourceManager;
+    private ?RedisResourceManager $resourceManager = null;
 
     /**
      * The redis resource id
-     *
-     * @var null|string
      */
-    protected $resourceId;
+    private ?string $resourceId = null;
 
     /**
      * The namespace prefix
-     *
-     * @var string
      */
-    protected $namespacePrefix = '';
+    private string $namespacePrefix = '';
 
     /**
      * Create new Adapter for redis storage
@@ -66,7 +59,7 @@ public function __construct($options = null)
 
         // reset initialized flag on update option(s)
         $initialized = &$this->initialized;
-        $this->getEventManager()->attach('option', function () use (&$initialized) {
+        $this->getEventManager()->attach('option', static function () use (&$initialized): void {
             $initialized = false;
         });
     }
@@ -185,9 +178,7 @@ protected function internalGetItems(array &$normalizedKeys)
         //combine the key => value pairs and remove all missing values
         return array_filter(
             array_combine($normalizedKeys, $results),
-            function ($value) {
-                return $value !== false;
-            }
+            static fn($value): bool => $value !== false
         );
     }
 
@@ -493,7 +484,7 @@ protected function internalGetCapabilities()
             $serializer        = $resourceMgr->getLibOption($options->getResourceId(), RedisResource::OPT_SERIALIZER);
             $redisVersion      = $resourceMgr->getMajorVersion($options->getResourceId());
             $minTtl            = version_compare((string) $redisVersion, '2', '<') ? 0 : 1;
-            $maxKeyLength      = version_compare((string) $redisVersion, '3', '<') ? 255 : 512000000;
+            $maxKeyLength      = version_compare((string) $redisVersion, '3', '<') ? 255 : 512_000_000;
             $supportedMetadata = $redisVersion >= 2 ? ['ttl'] : [];
 
             $this->capabilities = new Capabilities(
diff --git a/src/RedisCluster.php b/src/RedisCluster.php
index db116d0..cdee934 100644
--- a/src/RedisCluster.php
+++ b/src/RedisCluster.php
@@ -36,8 +36,7 @@ final class RedisCluster extends AbstractAdapter implements
     /** @var RedisClusterFromExtension|null */
     private $resource;
 
-    /** @var string|null */
-    private $namespacePrefix;
+    private ?string $namespacePrefix = null;
 
     /** @var RedisClusterResourceManagerInterface|null */
     private $resourceManager;
@@ -366,7 +365,7 @@ protected function internalGetCapabilities(): Capabilities
                 'staticTtl'          => true,
                 'ttlPrecision'       => 1,
                 'useRequestTime'     => false,
-                'maxKeyLength'       => $redisVersionLessThanV3 ? 255 : 512000000,
+                'maxKeyLength'       => $redisVersionLessThanV3 ? 255 : 512_000_000,
                 'namespaceIsPrefix'  => true,
             ]
         );
diff --git a/src/RedisClusterOptions.php b/src/RedisClusterOptions.php
index 1542dd1..db048e7 100644
--- a/src/RedisClusterOptions.php
+++ b/src/RedisClusterOptions.php
@@ -34,32 +34,25 @@ final class RedisClusterOptions extends AdapterOptions
     public const OPT_COMPRESSION_LEVEL      = 9;
     public const OPT_NULL_MULTIBULK_AS_NULL = 10;
 
-    /** @var string */
-    protected $namespaceSeparator = ':';
+    private string $namespaceSeparator = ':';
 
-    /** @var string */
-    private $name = '';
+    private string $name = '';
 
-    /** @var float */
-    private $timeout = 1.0;
+    private float $timeout = 1.0;
 
-    /** @var float */
-    private $readTimeout = 2.0;
+    private float $readTimeout = 2.0;
 
-    /** @var bool */
-    private $persistent = false;
+    private bool $persistent = false;
 
     /** @psalm-var list<non-empty-string> */
-    private $seeds = [];
+    private array $seeds = [];
 
-    /** @var string */
-    private $version = '';
+    private string $version = '';
 
     /** @psalm-var array<positive-int,mixed> */
-    private $libOptions = [];
+    private array $libOptions = [];
 
-    /** @var string */
-    private $password = '';
+    private string $password = '';
 
     /**
      * @param array|Traversable|null|AdapterOptions $options
diff --git a/src/RedisClusterResourceManager.php b/src/RedisClusterResourceManager.php
index ef6dae5..7732a67 100644
--- a/src/RedisClusterResourceManager.php
+++ b/src/RedisClusterResourceManager.php
@@ -6,6 +6,7 @@
 
 use Laminas\Cache\Exception\RuntimeException;
 use Laminas\Cache\Storage\Adapter\Exception\RedisRuntimeException;
+use Laminas\Cache\Storage\Adapter\RedisClusterOptions;
 use Laminas\Cache\Storage\Plugin\PluginInterface;
 use Laminas\Cache\Storage\Plugin\Serializer;
 use Laminas\Cache\Storage\PluginCapableInterface;
@@ -20,11 +21,10 @@
  */
 final class RedisClusterResourceManager implements RedisClusterResourceManagerInterface
 {
-    /** @var RedisClusterOptions */
-    private $options;
+    private RedisClusterOptions $options;
 
     /** @psalm-var array<positive-int,mixed> */
-    private $libraryOptions = [];
+    private array $libraryOptions = [];
 
     public function __construct(RedisClusterOptions $options)
     {
diff --git a/src/RedisOptions.php b/src/RedisOptions.php
index acd892b..3ce6161 100644
--- a/src/RedisOptions.php
+++ b/src/RedisOptions.php
@@ -5,6 +5,7 @@
 namespace Laminas\Cache\Storage\Adapter;
 
 use Laminas\Cache\Exception;
+use Laminas\Cache\Storage\Adapter\RedisResourceManager;
 
 use function sprintf;
 use function strlen;
@@ -20,27 +21,20 @@ final class RedisOptions extends AdapterOptions
      */
     protected $__prioritizedProperties__ = ['resource_manager', 'resource_id', 'server'];
     // @codingStandardsIgnoreEnd
-
     /**
      * The namespace separator
-     *
-     * @var string
      */
-    protected $namespaceSeparator = ':';
+    private string $namespaceSeparator = ':';
 
     /**
      * The redis resource manager
-     *
-     * @var null|RedisResourceManager
      */
-    protected $resourceManager;
+    private ?RedisResourceManager $resourceManager = null;
 
     /**
      * The resource id of the resource manager
-     *
-     * @var string
      */
-    protected $resourceId = 'default';
+    private string $resourceId = 'default';
 
     /**
      * Set namespace.
diff --git a/src/RedisResourceManager.php b/src/RedisResourceManager.php
index d123036..e271dce 100644
--- a/src/RedisResourceManager.php
+++ b/src/RedisResourceManager.php
@@ -29,10 +29,8 @@ final class RedisResourceManager
 {
     /**
      * Registered resources
-     *
-     * @var array
      */
-    protected $resources = [];
+    private array $resources = [];
 
     /**
      * Check if a resource exists
diff --git a/test/unit/RedisClusterOptionsFromIniTest.php b/test/unit/RedisClusterOptionsFromIniTest.php
index 936700c..18d4620 100644
--- a/test/unit/RedisClusterOptionsFromIniTest.php
+++ b/test/unit/RedisClusterOptionsFromIniTest.php
@@ -13,8 +13,7 @@
 
 final class RedisClusterOptionsFromIniTest extends TestCase
 {
-    /** @var string */
-    private $seedsConfigurationFromIni;
+    private string $seedsConfigurationFromIni;
 
     public function testWillThrowExceptionOnMissingSeedsConfiguration(): void
     {