diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b40e402..d2f196d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -54,7 +54,7 @@ lint:py:
     needs: []
     script:
         - pip install black==21.12b0
-        - black --diff .
+        - black --check .
 
 lint:js:
     image: node:14