diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6ad5bf26c51f10e050b904e785fc0e8e275bbc8d..0e9e574297f6e6a1c35fb16a549c96153cedd297 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,36 +28,31 @@ image: $DOCKER_IMAGE/$PYTHON_VERSION:latest
       - pyproject.toml
 
 format:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - black --check duniterpy tests examples
 
 build:
-  extends:
-    - .changes
+  extends: .changes
   stage: checks
   script:
     - poetry build
 
 isort:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - isort --check duniterpy tests examples
 
 type:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   script:
     - mypy duniterpy tests examples --ignore-missing-imports
 
 lint:
-  extends:
-    - .code_changes
+  extends: .code_changes
   stage: checks
   tags: [redshift]
   script: