diff --git a/.github/workflows/appengine-deploy.yml b/.github/workflows/appengine-deploy.yml
index db40b93..6856bbe 100644
--- a/.github/workflows/appengine-deploy.yml
+++ b/.github/workflows/appengine-deploy.yml
@@ -4,6 +4,9 @@ on:
     branches:
       - master
 
+permissions:
+  contents: read
+
 jobs:
   deploy:
     name: GAE deploy