diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 12a0511..7a6d0f4 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -6,6 +6,8 @@
 # For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
 
 name: Ruby
+permissions:
+  contents: read
 
 on:
   push: