diff --git a/.github/workflows/prebuild.yml b/.github/workflows/prebuild.yml
index dcc2734..a385586 100644
--- a/.github/workflows/prebuild.yml
+++ b/.github/workflows/prebuild.yml
@@ -5,6 +5,9 @@ on:
     branches:
       - prebuild
 
+permissions:
+  contents: read
+
 jobs:
   test_build:
     name: Test build