diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index beb47f0d76db6e2f773b64bbde0f3d58e9e02cdf..2d24f5f20e7841eb84bb90f925e46691fa4538b7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@ image: registry.esss.lu.se/ics-docker/miniconda
 
 pages:
   script:
-  - pip install sphinx sphinxcontrib-blockdiag blockdiag sphinxcontrib-restbuilder
+  - pip install sphinx sphinxcontrib-blockdiag blockdiag sphinxcontrib-restbuilder numpy
   - sphinx-build -b html -d public/doctrees   doc public
   artifacts:
     paths: