diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4f91f41c425a00d9be4d48db5b7d9693fb21a0ef..7a02bcb06bd8b665f99c21111a0114adb70b4072 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@ default:
 ### VARIABLES
 
 variables:
-  DEFAULT: "master"
+  DEFAULT: "stable/copper"
   OCAML: "4.13"
   NODE: "20"
   PUBLISH: "no"