diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 64cf8a58ab9b9ac46eea395c1408c274f3d0e487..dfccd7395d2913b272885128ae9c4f2f6906dd0c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -133,7 +133,8 @@ pages:
   tags:
     - git-run-ia2
   before_script:
-    - apt install gnuplot
+    - apt-get update -y
+    - apt install -y gnuplot
     - pip install --upgrade pip
     - pip install setuptools gnuplotlib pyvantagepro
     # Install project so Sphinx can import it