diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index de7f9b52c5bc39bfbea76b194bdcced62f01396f..71d5867c4bb6330fb4fc329fadb549942ab9de50 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,8 @@ after_script:
 stages:
   - lint
   - build
+variables:
+  PMBOOTSTRAP_TAG: 2.3.x
 
 # This defines the rules for when a pipeline should run.
 workflow: