diff --git a/.github/workflows/sync-cnb.yml b/.github/workflows/sync-cnb.yml
index 96377c14..60065649 100644
--- a/.github/workflows/sync-cnb.yml
+++ b/.github/workflows/sync-cnb.yml
@@ -1,12 +1,18 @@
 name: Sync to CNB
 
-on: [push]
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+
+permissions:
+  contents: read
 
 jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0