diff --git a/.github/workflows/build-phar.yml b/.github/workflows/build-phar.yml
index d1d37f5a70..2bb771f26c 100644
--- a/.github/workflows/build-phar.yml
+++ b/.github/workflows/build-phar.yml
@@ -6,6 +6,7 @@ on:
   push:
     branches:
       - master
+      - 4.0
     paths:
       - '.github/workflows/build-phar.yml'
       - '.github/workflows/reusable-build-phar.yml'
diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index 6dc881b502..ae4ea326b4 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -1,10 +1,11 @@
 name: Quicktest
 
 on:
-  # Run on pushes to all branches except for `master`.
+  # Run on pushes to all branches except for `master`/`4.0`.
   push:
     branches-ignore:
       - master
+      - 4.0
     paths-ignore:
       - '**.md'
   # Allow manually triggering the workflow.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 792ce63b66..14c4fa8a75 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,11 +1,12 @@
 name: Test
 
 on:
-  # Run on pushes to `master` and on all pull requests.
+  # Run on pushes to `master`/`4.0` and on all pull requests.
   # Prevent the build from running when there are only irrelevant changes.
   push:
     branches:
       - master
+      - 4.0
     tags:
       - '**'
     paths-ignore: