diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6c38ff23becc9f0e64f16968834f8f8866f8aedb..fedf490d3fc7a302148d556ddf9a1c270ad35db0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 pages:
   stage: deploy
-  image: python:latest
+  image: python:3.9.18-slim-bullseye
   script:
     - pip install mkdocs-material
     - mkdocs build --site-dir public