diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9e4e381b2099296e1b9be1e8bac8e79cde31203a..e64762aca82d1492ecf68fe2b30901e9d3b06f7c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,9 +80,9 @@ pages:
   stage: deploy
   script:
   - apt update
-  - apt-get -y install graphviz
+  - apt-get -y install graphviz=2.50.0
   - pip install -U sphinx m2r2 furo pyUML pydot==2.0.0 gprof2dot
-  - pip install graphviz==2.50.0
+  #- pip install graphviz==2.50.0
   - pip install -e .
   - mkdir public
   - cd public