diff --git a/.github/workflows/mattermost.yml b/.github/workflows/mattermost.yml
index 6a994f2e4..07d74ff77 100644
--- a/.github/workflows/mattermost.yml
+++ b/.github/workflows/mattermost.yml
@@ -1,7 +1,9 @@
 on:
-  pull_request:
+  pull_request_target:
     types: [ opened, reopened ]
 
+permissions: {}
+
 jobs:
   build:
     runs-on: ubuntu-latest