diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 2a0d76bb..74097ffd 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -3,6 +3,9 @@ name: auto-merge
 on:
   pull_request_target:
 
+# No GITHUB_TOKEN permissions, as we use AUTOMERGE_TOKEN instead.
+permissions: {}
+
 jobs:
   auto-merge:
     uses: mdn/workflows/.github/workflows/auto-merge.yml@main