diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7b5d37a..a1ee5ea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,8 +1,14 @@
 name: ci
 
 on:
-  push:
+  workflow_dispatch:
   pull_request:
+  push:
+    branches: [master, v2]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 
 defaults:
   run: