diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bf9db4df7aa85e4961646efb97d3044c75ff3e22..d75401df4d065534ccc70ce03219bf2aa8f76cc6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,6 +41,13 @@ build:
   script:
     - poetry build
 
+isort:
+  extends:
+    - .code_changes
+  stage: checks
+  script:
+    - isort --check duniterpy tests examples
+
 type:
   extends:
     - .code_changes