diff --git a/.github/workflows/assign_reviewer.yml b/.github/workflows/assign_reviewer.yml
index c3fc60fa9..b2a0517cb 100644
--- a/.github/workflows/assign_reviewer.yml
+++ b/.github/workflows/assign_reviewer.yml
@@ -6,6 +6,7 @@ on:
       - opened
       - reopened
       - edited
+      - synchronize
       - review_request_removed
       - labeled
 
@@ -15,7 +16,7 @@ permissions:
 jobs:
   assign_reviewer:
     runs-on: ubuntu-latest
-    if: contains(github.event.pull_request.labels.*.name, 'dependencies') && github.event.pull_request.requested_reviewers == null && (github.event.pull_request.user.login == 'renovate[bot]')
+    if: contains(github.event.pull_request.labels.*.name, 'dependencies') && toJson(github.event.pull_request.requested_reviewers) == '[]' &&  github.event.pull_request.user.login == 'renovate[bot]'
     steps:
     - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
     - name: Pick assignee