diff --git a/.github/workflows/update-multitenant-dep.yaml b/.github/workflows/update-multitenant-dep.yaml
index f8ae5d80e..38ad8f1c9 100644
--- a/.github/workflows/update-multitenant-dep.yaml
+++ b/.github/workflows/update-multitenant-dep.yaml
@@ -64,10 +64,12 @@ jobs:
           git commit -m "dep update: update ndc-postgres to $LATEST_SHA"
           git push origin $BRANCH_NAME
 
+          AUTHOR_USER=$(gh api search/users -f q="$AUTHOR_EMAIL")
+
           # create a pull-requests containing the updates.
           gh pr create \
             --body "Commit in ndc-postgres: https://github.com/hasura/ndc-postgres/commit/$LATEST_SHA" \
             --title "dep update: update ndc-postgres to $LATEST_SHA" \
             --head "$BRANCH_NAME" \
             --base "main" \
-            --assignee "$AUTHOR_EMAIL"
+            --assignee "$AUTHOR_USER"