diff --git a/.github/workflows/nightly-Homebrew-build.yml b/.github/workflows/nightly-Homebrew-build.yml
index 29ec96f73..37ffe9e83 100644
--- a/.github/workflows/nightly-Homebrew-build.yml
+++ b/.github/workflows/nightly-Homebrew-build.yml
@@ -17,6 +17,10 @@ on:
 # it only makes sense to test if this file has been changed
 
 name: Nightly-Homebrew-Build
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
   build-OpenBLAS-with-Homebrew:
     runs-on: macos-latest