diff --git a/tests/src/Kernel/CKEditor4To5Upgrade/UpgradePathTest.php b/tests/src/Kernel/CKEditor4To5Upgrade/UpgradePathTest.php
index 5dbd8fa..12bfac7 100644
--- a/tests/src/Kernel/CKEditor4To5Upgrade/UpgradePathTest.php
+++ b/tests/src/Kernel/CKEditor4To5Upgrade/UpgradePathTest.php
@@ -119,7 +119,7 @@ class UpgradePathTest extends SmartDefaultSettingsTest {
   /**
    * {@inheritdoc}
    */
-  public function provider() {
+  public static function provider() {
     $expected_ckeditor5_toolbar = [
       'items' => [
         'bold',