diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8cf5c0dcd3d2e02cc04cd534d0e56e9dab50f670..f53a063829d3d8e0860e0bc06bd653fe5ee5b7a0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,7 +15,7 @@ pages:
   script:
   - pip install -U sphinx
   - pip install sphinx-rtd-theme
-  - pip install numpy biopython matplotlib scikit-learn
+  - pip install numpy biopython matplotlib scikit-learn pytest
   - sphinx-build -b html docs/source public
   artifacts:
     paths: