diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bf9db4df7aa85e4961646efb97d3044c75ff3e22..66a219a9655e8e77c63211b5bc9e26ee6b731fc6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,6 +41,14 @@ build:
   script:
     - poetry build
 
+isort:
+  extends:
+    - .code_changes
+  stage: checks
+  script:
+    - poetry install
+    - poetry run isort --check duniterpy tests examples
+
 type:
   extends:
     - .code_changes