diff --git a/Brewfile b/Brewfile
index daf13af8bf..4ac325e80a 100644
--- a/Brewfile
+++ b/Brewfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 tap "homebrew/core"
 tap "homebrew/bundle"
 tap "homebrew/services"