diff --git a/.github/workflows/add-milestone-to-pull-requests.yml b/.github/workflows/add-milestone-to-pull-requests.yml
index 63f8268963..b6c829c2a0 100644
--- a/.github/workflows/add-milestone-to-pull-requests.yml
+++ b/.github/workflows/add-milestone-to-pull-requests.yml
@@ -8,6 +8,7 @@ jobs:
     permissions:
       contents: read
       issues: write
+      pull-requests: write
     runs-on: ubuntu-latest
     if: github.event.pull_request.merged == true && github.event.pull_request.milestone == null
     steps: