diff --git a/.github/workflows/downstream-gate.yml b/.github/workflows/downstream-gate.yml
index f6b813427..f05bbec84 100644
--- a/.github/workflows/downstream-gate.yml
+++ b/.github/workflows/downstream-gate.yml
@@ -10,6 +10,9 @@ name: Downstream hard-gate exact replay
         required: true
 permissions:
   contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 defaults:
   run:
     shell: bash