diff --git a/.github/workflows/filediff.yml b/.github/workflows/filediff.yml
index fab476d..3ca6b6e 100644
--- a/.github/workflows/filediff.yml
+++ b/.github/workflows/filediff.yml
@@ -1,6 +1,8 @@
 name: FileDiff
 on:
   pull_request:
+permissions:
+  contents: read
 
 jobs:
   filediff: