diff --git a/.github/workflows/manual-build.yml b/.github/workflows/manual-build.yml
index 3930518..9e2fe87 100644
--- a/.github/workflows/manual-build.yml
+++ b/.github/workflows/manual-build.yml
@@ -28,6 +28,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           repository: jimeh/build-emacs-for-macos
+          ref: "0.4.11"
           path: builder
       - uses: ruby/setup-ruby@v1
         with: