diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d4a3818f6bab3e630d46ef1afa3a48e48e42c431..0486f567014bf8b5e109f3e9cbc953312e468cf5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -33,7 +33,7 @@ default:
         - python3 -m pip install .
         - cd ..
         # Install OpenMDAO
-        - python3 -m pip install openmdao^<3.35
+        - python3 -m pip install 'openmdao<3.35'
 
 .global_tag: &global_tag_def
     tags: