diff --git a/.github/workflows/release-builtins.yml b/.github/workflows/release-builtins.yml
index 917dd3d..882fd20 100644
--- a/.github/workflows/release-builtins.yml
+++ b/.github/workflows/release-builtins.yml
@@ -28,11 +28,7 @@ jobs:
         submodules: true
         fetch-depth: 0
         persist-credentials: false
-    - name: update core
-      env:
-        TAG: ${{ inputs.tag || 'origin/master '}}
-      # needs to detach because we can update to a tag
-      run: git -C uap-core switch --detach "$TAG"
+        ref: ${{ inputs.tag || 'origin/master '}}
     - name: Set up Python
       uses: actions/setup-python@v5
       with: