diff --git a/lib/redacting_logger.rb b/lib/redacting_logger.rb
index a174835..44d44c8 100644
--- a/lib/redacting_logger.rb
+++ b/lib/redacting_logger.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "logger"
 
 # RedactingLogger is a custom logger that extends the standard Logger class.
diff --git a/spec/lib/redacting_logger_spec.rb b/spec/lib/redacting_logger_spec.rb
index 2377dc3..e0d460f 100644
--- a/spec/lib/redacting_logger_spec.rb
+++ b/spec/lib/redacting_logger_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "logger"
 require "stringio"
 require_relative "../spec_helper"