diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b1365ccd..4df375e64 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,7 @@ on:
   pull_request:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref_name }}
   cancel-in-progress: true
 
 jobs:
diff --git a/.github/workflows/sync_class_ref.yml b/.github/workflows/sync_class_ref.yml
index 0f8680283..22db8a1ae 100644
--- a/.github/workflows/sync_class_ref.yml
+++ b/.github/workflows/sync_class_ref.yml
@@ -11,7 +11,7 @@ on:
 
 # Make sure jobs cannot overlap.
 concurrency:
-  group: classref-sync-ci-master
+  group: classref-sync-ci-${{ github.ref_name }}
   cancel-in-progress: true
 
 jobs: