diff --git a/tests/Levels/LevelsIntegrationTest.php b/tests/Levels/LevelsIntegrationTest.php
index d1e57d7..38fda09 100644
--- a/tests/Levels/LevelsIntegrationTest.php
+++ b/tests/Levels/LevelsIntegrationTest.php
@@ -10,7 +10,7 @@ class LevelsIntegrationTest extends LevelsTestCase
 	/**
 	 * @return string[][]
 	 */
-	public function dataTopics(): array
+	public static function dataTopics(): array
 	{
 		return [
 			['arithmeticOperators'],