diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44214bc..ab6ec5d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,7 +3,13 @@ name: CI
 on:
   push:
     branches:
-      - '**'
+      - main
+  pull_request:
+    types: [opened, synchronize]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build: