diff --git a/lib/helpers/parse_rails.rb b/lib/helpers/parse_rails.rb
index 82f71ee5..d6ed7f14 100644
--- a/lib/helpers/parse_rails.rb
+++ b/lib/helpers/parse_rails.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-Synvert::Helper.new 'rails/parse' do |options|
+Synvert::Helper.new 'rails/parse' do |_options|
   configure(parser: Synvert::PRISM_PARSER)
 
   # Set number_of_workers to 1 to skip parallel.
diff --git a/lib/ruby/nested_class_definition.rb b/lib/ruby/nested_class_definition.rb
index 5fa8afe9..a7b19f24 100644
--- a/lib/ruby/nested_class_definition.rb
+++ b/lib/ruby/nested_class_definition.rb
@@ -39,7 +39,7 @@ def test; end
       class_name = parts.pop
       new_parts = parts.map.with_index { |mod, index| ' ' * NodeMutation.tab_width * index + "module #{mod}" }
       new_parts.concat(source.sub(parts.join('::') + '::', '').split("\n").map { |line| (' ' * NodeMutation.tab_width * parts.size) + line })
-      new_parts.concat(parts.map.with_index { |mod, index| ' ' * NodeMutation.tab_width * (parts.size - index - 1) + "end" })
+      new_parts.concat(parts.map.with_index { |_mod, index| ' ' * NodeMutation.tab_width * (parts.size - index - 1) + "end" })
 
       replace_with new_parts.join("\n")
     end