diff --git a/.github/workflows/ubuntu_basic.yml b/.github/workflows/ubuntu_basic.yml
index df379b0..f915591 100644
--- a/.github/workflows/ubuntu_basic.yml
+++ b/.github/workflows/ubuntu_basic.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 jobs:
   run-unit-tests:
     timeout-minutes: 60