diff --git a/.github/workflows/test_suite.yml b/.github/workflows/test_suite.yml
index 42d2c724f..a62b4ef88 100644
--- a/.github/workflows/test_suite.yml
+++ b/.github/workflows/test_suite.yml
@@ -6,6 +6,9 @@ on:
       - master
   pull_request:
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
 # the following are optional jobs and need to be configured according
 # to this project's settings: