diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8cfa6fe3cdf6..c2797b133706 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,6 +11,9 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   ubuntu-18_04:
     runs-on: ubuntu-18.04