diff --git a/.github/actions/install-python-upstream/action.yml b/.github/actions/install-python-upstream/action.yml
index dc44470c..83b83cf3 100644
--- a/.github/actions/install-python-upstream/action.yml
+++ b/.github/actions/install-python-upstream/action.yml
@@ -23,3 +23,8 @@ runs:
         which python3
         python3 --version
         python3 -c "import sysconfig; print(sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET'))"
+    - shell: bash
+      name: Set up venv with upstream Python
+      run: |
+        python3 -m venv /tmp/venv
+        echo "/tmp/venv/bin" >> $GITHUB_PATH