diff --git a/.github/workflows/v4-sync.yml b/.github/workflows/v4-sync.yml
new file mode 100644
index 000000000..a04938ec4
--- /dev/null
+++ b/.github/workflows/v4-sync.yml
@@ -0,0 +1,23 @@
+name: v4 sync
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: '4.x'
+
+      - name: Rebase 4.x branch
+        run: |
+          # Set git user from the latest commit
+          git config user.name "$(git --no-pager log --format=format:'%an' -n 1)"
+          git config user.email "$(git --no-pager log --format=format:'%ae' -n 1)"
+          git rebase origin/main
+          git push --force
diff --git a/composer.json b/composer.json
index f9ea7ac24..4b04c9fcb 100644
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,7 @@
     "minimum-stability": "dev",
     "require": {
         "ext-curl": "*",
+        "drupal/core": "^9.5",
         "drupal/admin_toolbar": "^3.0",
         "drupal/allowed_formats": "^2.0",
         "drupal/config_ignore": "^2.3",