diff --git a/.github/workflows/code-check.yml b/.github/workflows/code-check.yml
index d5db411..86d8f7d 100644
--- a/.github/workflows/code-check.yml
+++ b/.github/workflows/code-check.yml
@@ -35,7 +35,7 @@ jobs:
         run: vendor/bin/phpcs
 
       - name: Psalm
-        run: vendor/bin/psalm --stats --output-format=github
+        run: vendor/bin/psalm --stats --shepherd --output-format=github
 
       - name: PHPStan
         run: vendor/bin/phpstan analyse