diff --git a/.gitea/workflows/masterplan-lock.yml b/.gitea/workflows/masterplan-lock.yml
index 2a8d813..05c96fb 100644
--- a/.gitea/workflows/masterplan-lock.yml
+++ b/.gitea/workflows/masterplan-lock.yml
@@ -8,10 +8,14 @@ name: masterplan-lock
 
 on:
   push:
-    branches: ["**"]
+    branches: [main]
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ gitea.workflow }}-${{ gitea.ref }}
+  cancel-in-progress: true
+
 jobs:
   check:
     runs-on: ubuntu-latest