diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 75037aefa22fb2ac167e8c2005ee8f26b7d2b254..44e001f64e7cb3c2438582c204768f8e08778ac4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,7 +31,8 @@ test:
 pages:
   stage: deploy
   script:
-  - pip install -U sphinx
+  - pip3 install -U sphinx
+  - pip3 install sphinx-rtd-theme
   - sphinx-build -b html docs/source/ public/
   artifacts:
     paths: