diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9bbde54..d5b7af3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,6 +7,7 @@ name: CI
 # - Concurrency cancels superseded PR/branch tip runs
 
 on:
+  merge_group:
   workflow_dispatch:
   push:
     branches: [main]
@@ -16,7 +17,7 @@ permissions:
   contents: read
 concurrency:
   # Fast Trunk: supersede obsolete runs for the same PR or branch tip.
-  group: ci-${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  group: ci-${{ github.workflow }}-${{ github.event.pull_request.number || github.event.merge_group.head_sha || github.ref }}
   cancel-in-progress: true
 
 jobs: