diff --git a/.github/workflows/close.yml b/.github/workflows/close.yml
index ba4e5add98..a1b756a75e 100644
--- a/.github/workflows/close.yml
+++ b/.github/workflows/close.yml
@@ -6,11 +6,12 @@ on:
 jobs:
   close:
     name: Close
-    runs-on:  ubuntu-latest
+    runs-on:  ubuntu-20.04
     steps:
       - uses: actions/checkout@master
       - name: remove branch specific artifacts from AWS S3
         run: ./src/scripts/remove_branch_artifacts_from_s3.sh ${{ github.head_ref }}
         env:
+            AWS_DEFAULT_REGION: us-east-1
             AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
             AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}