diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c44e79aad0..8802871dc9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,6 +82,7 @@ jobs:
           !contains(github.event.pull_request.labels.*.name, 'internal-change')
         run: |
           git fetch origin master:master
+          git fetch origin ${{ github.event.pull_request.base.ref }}:${{ github.event.pull_request.base.ref }}
           ./scripts/ensure-version-bump-and-changelog.sh
         env:
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}