diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 395fd20..03d0901 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -1,8 +1,15 @@
 name: check
 on:
   push:
+    branches: [main]
+    tags: ['**']
   pull_request:
   workflow_dispatch:
+# Supersede only the same PR; main, tags and manual runs stay independent.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 jobs: