diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 800b93ce1c94c94739d8845b34ce3ddea5cf1ffa..9ac1b74e07b8c5a73003b1b9dde31de00784a70b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -75,7 +75,7 @@ deploy_zenodo:
 
 pages:
     stage: deploy
-    image: python:3.9.7-alpine
+    image: python:3.9.7-slim
     script:
       - pip install --upgrade pip
       - pip install -U -r docs/doc_requirements.txt