diff --git a/.github/workflows/upgrade-python-requirements.yml b/.github/workflows/upgrade-python-requirements.yml
index 71915c4a..5888bf5c 100644
--- a/.github/workflows/upgrade-python-requirements.yml
+++ b/.github/workflows/upgrade-python-requirements.yml
@@ -12,7 +12,7 @@ on:
 jobs:
    call-upgrade-python-requirements-workflow:
     with:
-       branch: ${{ github.event.inputs.branch }}
+       branch: ${{ github.event.inputs.branch || main }}
        # team_reviewers: ""
        # email_address: email@edx.org
        send_success_notification: false