diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a76b440..6cb978ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,8 +2,13 @@ name: CI
 
 on:
   push:
+    branches: [main]
   pull_request:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read