diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cc5e0b9..20be47b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,6 +6,9 @@ on:
   schedule:
     - cron: "0 8,20 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   unit-tests:
     name: Unit tests