diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 535d2963ebd7713137d8cb6e64795937280153a9..be57d891863ea73742f0f12fb0e7f316a7223c81 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -134,7 +134,7 @@ pages:
     - git-run-ia2
   before_script:
     - pip install --upgrade pip
-    - pip install setuptools
+    - pip install setuptools gnuplotlib
     # Install project so Sphinx can import it
     - pip install -e .
     # Install doc dependencies