diff --git a/.github/workflows/nightly-merge.yml b/.github/workflows/nightly-merge.yml
index bfdc248190..20bc85e012 100644
--- a/.github/workflows/nightly-merge.yml
+++ b/.github/workflows/nightly-merge.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Nightly Merge
       uses: robotology/gh-action-nightly-merge@v1.3.3
       with:
-        stable_branch: 'master'
+        stable_branch: 'yarp-3.9'
         development_branch: 'master'
         allow_ff: false
         user_name: 'robotology-bot'