diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b57e2188de2a93fa7e12589ddad0642557aa1233..13cb19d11cf6c00f801d236f8b8a8d343ae7fa90 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -55,6 +55,8 @@ lint:
   script:
     - poetry install
     - make pylint
+  variables:
+    PYTHON_VERSION: "3.9"
 
 .tests:
   extends: .changes