diff --git a/.github/sync-repo-settings.yaml b/.github/sync-repo-settings.yaml
index b18fb9c29..2697f214c 100644
--- a/.github/sync-repo-settings.yaml
+++ b/.github/sync-repo-settings.yaml
@@ -3,7 +3,7 @@
 branchProtectionRules:
 # Identifies the protection rule pattern. Name of the branch to be protected.
 # Defaults to `master`
-- pattern: master
+- pattern: '{master,v3}'
   requiredStatusCheckContexts:
     - 'Kokoro'
     - 'Kokoro snippets-3.8'