diff --git a/queue_unique.info.yml b/queue_unique.info.yml
index 86f2171..8eb9d3a 100644
--- a/queue_unique.info.yml
+++ b/queue_unique.info.yml
@@ -1,6 +1,5 @@
 name: 'Queue unique'
 type: module
 description: 'Provides queues that only accepts unique items.'
-core: 8.x
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8.7.7 || ^9
 package: 'Queues'
diff --git a/src/UniqueDatabaseQueue.php b/src/UniqueDatabaseQueue.php
index 89e9f6e..8dcb44f 100644
--- a/src/UniqueDatabaseQueue.php
+++ b/src/UniqueDatabaseQueue.php
@@ -28,7 +28,7 @@ class UniqueDatabaseQueue extends DatabaseQueue {
           'data' => serialize($data),
           'created' => time(),
           // Generate a unique value for this data on this queue.
-          'md5' => md5($this->name . serialize($data))
+          'md5' => md5($this->name . serialize($data)),
         ]);
       return $query->execute();
     }
@@ -56,11 +56,11 @@ class UniqueDatabaseQueue extends DatabaseQueue {
             'type' => 'char',
             'length' => 32,
             'not null' => TRUE,
-          ]
+          ],
         ],
         'unique keys' => [
-          'unique' => ['md5']
-        ]
+          'unique' => ['md5'],
+        ],
       ]
     );
   }
diff --git a/test/src/Kernel/UniqueQueueTest.php b/test/src/Kernel/UniqueQueueTest.php
index 464d006..805bee4 100644
--- a/test/src/Kernel/UniqueQueueTest.php
+++ b/test/src/Kernel/UniqueQueueTest.php
@@ -14,11 +14,9 @@ use Drupal\queue_unique\UniqueDatabaseQueue;
 class QueueUniqueTest extends KernelTestBase {
 
   /**
-   * Modules to enable.
-   *
-   * @var string[]
+   * {@inheritdoc}
    */
-  public static $modules = ['queue_unique'];
+  protected static $modules = ['queue_unique'];
 
   /**
    * {@inheritdoc}