diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index bf346dd63..00f923f05 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
   job:
     name: ${{ matrix.name }}-build-and-test