diff --git a/.github/workflows/prebuild-ci.yml b/.github/workflows/prebuild-ci.yml
index 764a71a..7d4b17f 100644
--- a/.github/workflows/prebuild-ci.yml
+++ b/.github/workflows/prebuild-ci.yml
@@ -9,6 +9,9 @@ on:
     branches:
       - prebuild
 
+permissions:
+  contents: read
+
 jobs:
   frontend-test-build:
     name: Frontend (Test & Build)