diff --git a/.github/workflows/sync-fork-default-branch.yml b/.github/workflows/sync-fork-default-branch.yml
new file mode 100644
index 00000000000000..1d213eaaf5bca3
--- /dev/null
+++ b/.github/workflows/sync-fork-default-branch.yml
@@ -0,0 +1,20 @@
+name: Sync Fork's Default Branch
+
+permissions:
+  contents: write
+
+on:
+  schedule:
+    - cron: "0 0 * * *" # every day at midnight UTC
+
+jobs:
+  sync-fork:
+    runs-on: ubuntu-latest
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Sync Repo
+      run: gh repo sync github/ruby