diff --git a/.github/workflows/test-build-processes.yml b/.github/workflows/test-build-processes.yml
index dcaf4c36414ed..45dae25ce395b 100644
--- a/.github/workflows/test-build-processes.yml
+++ b/.github/workflows/test-build-processes.yml
@@ -88,6 +88,7 @@ jobs:
     with:
       os: ${{ matrix.os }}
       directory: ${{ matrix.directory }}
+      gutenberg-branch: 'wp/6.6'
 
   # Tests the Gutenberg plugin build process on MacOS when run within a wordpress-develop checkout.
   #
@@ -111,6 +112,7 @@ jobs:
     with:
       os: ${{ matrix.os }}
       directory: ${{ matrix.directory }}
+      gutenberg-branch: 'wp/6.6'
 
   slack-notifications:
     name: Slack Notifications