diff --git a/composer.json b/composer.json
index c1b64129..d9f76baa 100644
--- a/composer.json
+++ b/composer.json
@@ -63,7 +63,8 @@
         "doctrine/couchdb": "^dev-master#9eeb9e5",
         "triagens/arangodb": "^3.8",
         "google/cloud-firestore": "^1.20",
-        "aws/aws-sdk-php": "~3.0"
+        "aws/aws-sdk-php": "~3.0",
+        "psr/event-dispatcher": "~1.0"
     },
     "conflict": {
         "doctrine/couchdb": "<dev-master#9eeb9e5",
diff --git a/lib/Phpfastcache/Core/Pool/CacheItemPoolTrait.php b/lib/Phpfastcache/Core/Pool/CacheItemPoolTrait.php
index a942ad29..eed33770 100644
--- a/lib/Phpfastcache/Core/Pool/CacheItemPoolTrait.php
+++ b/lib/Phpfastcache/Core/Pool/CacheItemPoolTrait.php
@@ -458,6 +458,13 @@ protected function validateCacheKey(string $key): void
                     Please check: https://github.com/PHPSocialNetwork/phpfastcache/wiki/%5BV6%5D-Unsupported-characters-in-key-identifiers'
             );
         }
+
+        if (strlen($key) > 64) {
+            throw new PhpfastcacheInvalidArgumentException(
+                'Cache key is too long (up to 64 chars maximum). 
+                    Please check: https://www.php-fig.org/psr/psr-6/'
+            );
+        }
     }
 
     protected function handleExpiredCacheItem(ExtendedCacheItemInterface $item): void
diff --git a/tests/Solr.test.php b/tests/Solr.test.php
index 1fb0c820..f78f27f8 100644
--- a/tests/Solr.test.php
+++ b/tests/Solr.test.php
@@ -13,8 +13,6 @@
  */
 
 use Phpfastcache\CacheManager;
-use Phpfastcache\Core\Pool\ExtendedCacheItemPoolInterface;
-use Phpfastcache\Event\EventReferenceParameter;
 use Phpfastcache\EventManager;
 use Phpfastcache\Tests\Helper\TestHelper;
 use Phpfastcache\Drivers\Solr\Config as SolrConfig;
@@ -23,6 +21,11 @@
 require_once __DIR__ . '/../vendor/autoload.php';
 $testHelper = new TestHelper('Solr driver');
 
+if(!class_exists(Psr\EventDispatcher\EventDispatcherInterface::class)) {
+    $testHelper->assertSkip('PSR EventDispatcher is not installed !');
+    $testHelper->terminateTest();
+}
+
 /** @var SolrConfig $solrConfig */
 $solrConfig = $testHelper->preConfigure(new SolrConfig());
 $solrConfig->setCoreName('phpfastcache'); // Optional: Default value