diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 40a9fd6..672429f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -43,6 +43,7 @@ validate:
   rules:
     - if: $CI_PIPELINE_SOURCE == "push"
   before_script:
+    - apk add --no-cache git >/dev/null   # pruefe_prosa.py braucht git cat-file
     - pip install --quiet pyyaml
   script:
     - python3 scripts/validate.py