diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f94319eb05..cb7a64a706 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,6 +14,9 @@ on:
     - cron:  '0 4 1 * *'
   workflow_dispatch:
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
   build:
     runs-on: ${{ matrix.os }}