diff --git a/.github/workflows/sync-ruby.yml b/.github/workflows/sync-ruby.yml
index 701a23ae052a..91ec9cd4b561 100644
--- a/.github/workflows/sync-ruby.yml
+++ b/.github/workflows/sync-ruby.yml
@@ -2,6 +2,9 @@ name: Sync ruby
 on:
   push:
     branches: [master]
+permissions:
+  contents: read
+
 jobs:
   sync:
     name: Sync ruby