diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df4f8fc..288108b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main, master]
 
+permissions:
+  contents: read
+
 jobs:
   shellcheck:
     name: ShellCheck