diff --git a/tests/phpstan.neon b/tests/phpstan.neon
index 38f367fa..0bea408a 100644
--- a/tests/phpstan.neon
+++ b/tests/phpstan.neon
@@ -1,6 +1,6 @@
 parameters:
   errorFormat: raw
-  level: 4
+  level: 5
   paths:
     - ../core
     - ../ext