diff -u b/src/Hook/ChatSpaceHooks.php b/src/Hook/ChatSpaceHooks.php
--- b/src/Hook/ChatSpaceHooks.php
+++ b/src/Hook/ChatSpaceHooks.php
@@ -28,7 +28,7 @@
      * Implements hook_theme().
      */
     #[Hook('theme')]
-    public static function theme($existing, $type, $theme, $path)
+    public function theme($existing, $type, $theme, $path)
     {
         return [
             'chat_space_room' => [
@@ -79,7 +79,7 @@
      * Implements hook_cron().
      */
     #[Hook('cron')]
-    public static function cron()
+    public function cron()
     {
         $config = \Drupal::config('chat_space.settings');
         $retention_days = $config->get('mention_retention_days') ?: 30;
@@ -117,7 +117,7 @@
      * Implements hook_user_cancel().
      */
     #[Hook('user_cancel')]
-    public static function userCancel($edit, $account, $method)
+    public function userCancel($edit, $account, $method)
     {
         try {
             // Remove mentions sent by this user.
@@ -148,7 +148,7 @@
      * Implements hook_entity_delete().
      */
     #[Hook('entity_delete')]
-    public static function entityDelete($entity)
+    public function entityDelete($entity)
     {
         if ($entity->getEntityTypeId() === 'chat_space_message') {
             try {
@@ -185,7 +185,7 @@
      * Implements hook_preprocess_HOOK() for mention notifications.
      */
     #[Hook('preprocess_chat_space_mention_notification')]
-    public static function preprocessChatSpaceMentionNotification(&$variables)
+    public function preprocessChatSpaceMentionNotification(&$variables)
     {
         $sender = $variables['sender'];
         $mentioned_user = $variables['mentioned_user'];