diff --git a/.github/workflows/maintainance_bot.yaml b/.github/workflows/maintainance_bot.yaml
index e066889b9aa..3c14405a76a 100644
--- a/.github/workflows/maintainance_bot.yaml
+++ b/.github/workflows/maintainance_bot.yaml
@@ -16,8 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Assign Milestone
+      env:
+       MILESTONE: "20.01"
       run: |
         curl --request PATCH \
         --url ${{ github.event.pull_request.issue_url }} \
         --header 'authorization: token ${{ secrets.GITHUB_TOKEN }}' \
-        --data '{"milestone": 20.01}'
+        --data '{"milestone": $MILESTONE}'