diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d72e557d91a3599d4d060de0e85c4abb95b71359..64cf8a58ab9b9ac46eea395c1408c274f3d0e487 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -133,6 +133,7 @@ pages:
   tags:
     - git-run-ia2
   before_script:
+    - apt install gnuplot
     - pip install --upgrade pip
     - pip install setuptools gnuplotlib pyvantagepro
     # Install project so Sphinx can import it