diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1de615b76aeeb5922205beb6a9eec94edbbad794..c48182a82adf8d3981f2b0a8b4bcd04250952789 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -73,7 +73,7 @@ pylint:
 
 
 pages:
-  image: python3.9
+  image: python:3.9.18-bookworm
   stage: doc
   before_script:
     - pip install sphinx==4.5.0 sphinxcontrib-apidoc==0.3.0 sphinx-rtd-theme==1.0.0 recommonmark==0.7.1 sphinxcontrib-napoleon==0.7 sphinx-autoapi==1.8.4