diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 911d52abaa56505b08ae09b47085da908982fac8..49a77ed0df00b003cc36d377f5eaf0694aed3ff5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,7 @@
 ---
+variables:
+  DUNECI_BRANCH: releases/2.5
+
 before_script:
   - duneci-install-module https://gitlab.dune-project.org/core/dune-common.git