diff --git a/.github/workflows/cpp-bindings.yml b/.github/workflows/cpp-bindings.yml
index 54593ff548..2a53272c4b 100644
--- a/.github/workflows/cpp-bindings.yml
+++ b/.github/workflows/cpp-bindings.yml
@@ -10,6 +10,7 @@ on:
       - "*akefile*"
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 jobs:
diff --git a/.github/workflows/cruby-bindings.yml b/.github/workflows/cruby-bindings.yml
index d635e550f0..6fed2aa44a 100644
--- a/.github/workflows/cruby-bindings.yml
+++ b/.github/workflows/cruby-bindings.yml
@@ -9,6 +9,8 @@ on:
     branches:
       - main
   pull_request:
+    branches:
+      - main
 
 jobs:
   test-all:
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index c5258a2f5e..e3fc52303c 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -8,6 +8,7 @@ on:
   push:
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 jobs:
diff --git a/.github/workflows/java-wasm-bindings.yml b/.github/workflows/java-wasm-bindings.yml
index d7fe81f171..4715d6f93b 100644
--- a/.github/workflows/java-wasm-bindings.yml
+++ b/.github/workflows/java-wasm-bindings.yml
@@ -9,6 +9,7 @@ on:
       - "*akefile*"
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 jobs:
diff --git a/.github/workflows/javascript-bindings.yml b/.github/workflows/javascript-bindings.yml
index 3753ea2ce9..2e4330b2be 100644
--- a/.github/workflows/javascript-bindings.yml
+++ b/.github/workflows/javascript-bindings.yml
@@ -9,6 +9,7 @@ on:
       - "*akefile*"
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 jobs:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9ed312d4d5..356956ec8f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,6 +8,7 @@ on:
   push:
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 jobs:
diff --git a/.github/workflows/rust-bindings.yml b/.github/workflows/rust-bindings.yml
index 51e90fdaf0..850646c772 100644
--- a/.github/workflows/rust-bindings.yml
+++ b/.github/workflows/rust-bindings.yml
@@ -10,6 +10,7 @@ on:
       - "*akefile*"
     branches:
       - main
+      - ruby-4.0
   pull_request:
 
 env:
diff --git a/.github/workflows/sync-ruby.yml b/.github/workflows/sync-ruby.yml
index 72be2a09c5..55401876f9 100644
--- a/.github/workflows/sync-ruby.yml
+++ b/.github/workflows/sync-ruby.yml
@@ -1,7 +1,9 @@
 name: Sync ruby
 on:
   push:
-    branches: [main]
+    branches:
+      - main
+      - ruby-4.0
 jobs:
   sync:
     name: Sync ruby
@@ -10,6 +12,14 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - name: Set ruby/ruby target branch
+        id: target
+        run: |
+          case "$GITHUB_REF_NAME" in
+            main)      echo "ref=master" >> "$GITHUB_OUTPUT" ;;
+            ruby-4.0)  echo "ref=ruby_4_0" >> "$GITHUB_OUTPUT" ;;
+          esac
+
       - name: Create GitHub App token
         id: app-token
         uses: actions/create-github-app-token@v3
@@ -26,7 +36,7 @@ jobs:
           repo: ruby
           workflow_file_name: sync_default_gems.yml
           github_token: ${{ steps.app-token.outputs.token }}
-          ref: master
+          ref: ${{ steps.target.outputs.ref }}
           client_payload: |
             {"gem":"${{ github.event.repository.name }}","before":"${{ github.event.before }}","after":"${{ github.event.after }}"}
           propagate_failure: true