diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c217f6511..748940b33 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -47,7 +47,7 @@ workflow:
 variables:
   GIT_CLONE_PATH: '$CI_BUILDS_DIR/$CI_COMMIT_SHA/$CI_JOB_ID'
   YNH_SOURCE: "https://github.com/yunohost"
-  YNH_DEBIAN: "bookworm"
+  YNH_DEBIAN: "bullseye"
   YNH_SKIP_DIAGNOSIS_DURING_UPGRADE: "true"
 
 include: