henkei.gemspec in henkei-1.20.0 vs henkei.gemspec in henkei-1.21.0

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 require 'henkei/version'
 
@@ -20,11 +22,11 @@
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'json', '>= 1.8', '< 3'
   spec.add_runtime_dependency 'mime-types', '>= 1.23', '< 4'
 
-  spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_development_dependency 'rake', '~> 12.3'
   spec.add_development_dependency 'rspec', '~> 3.7'
-  spec.add_development_dependency 'rubocop', '~> 0.53'
+  spec.add_development_dependency 'rubocop', '~> 0.71'
   spec.add_development_dependency 'simplecov', '~> 0.15'
 end