diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0f8c3bf..8d68fa0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,6 +25,7 @@ before_script:
 
 lint:
   stage: lint
+  image: python:3
   script:
     - pip3 install black
     - black --check src/