diff --git a/.github/workflows/phpstan-5.yaml b/.github/workflows/phpstan-5.yaml
index 82ea484..8a87995 100644
--- a/.github/workflows/phpstan-5.yaml
+++ b/.github/workflows/phpstan-5.yaml
@@ -19,5 +19,5 @@ jobs:
         uses: php-actions/phpstan@v2
         with:
           path: src/
-          level: 4
+          level: 5
           php_version: 8.0