diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4cbdea275e5d330aad927dccb589f1aeebb4cf89..af4910f4e5e41541f881f19f728cff88b323dec9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ image: python:3.7-alpine
 test:
   stage: test
   script:
-  - pip install -U sphinx
+  - pip install -U sphinx, alabaster
   - cp -r Docs/* .
   - sphinx-build -b html . public
   only:
@@ -14,7 +14,7 @@ test:
 pages:
   stage: deploy
   script:
-  - pip install -U sphinx
+  - pip install -U sphinx, alabaster
   - cp -r Docs/* .
   - sphinx-build -b html . public
   - cp Docs/hhu-logo.png public/_static/hhu-logo.png