diff --git a/.github/workflows/Build_External_Rock.yaml b/.github/workflows/Build_External_Rock.yaml
index 28e15f0..5132c86 100644
--- a/.github/workflows/Build_External_Rock.yaml
+++ b/.github/workflows/Build_External_Rock.yaml
@@ -14,7 +14,7 @@ jobs:
             oci-archive-name: "external_mock-rock"
             # rock-repo: clay-lake/mock-rock
             rock-repo: https://git.savannah.gnu.org/git/screen.git
-            rock-repo-commit: main
-            # rock-repo-commit: master
+            # rock-repo-commit: main
+            rock-repo-commit: master
             rockfile-directory: /mock-rock/1.1/