diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 4bb41de22e..c89635ea82 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -88,7 +88,7 @@ jobs:
       - name: Set up Launchable
         uses: ./.github/actions/launchable/setup
         with:
-          os: ${{ matrix.os }}
+          os: ${{ matrix.os || (github.repository == 'ruby/ruby' && 'macos-arm-oss' || 'macos-14')}}
           test-opts: ${{ matrix.test_opts }}
           launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
           builddir: build