xml-kit.gemspec in xml-kit-0.3.1 vs xml-kit.gemspec in xml-kit-0.4.0

@@ -12,11 +12,11 @@
 
   spec.summary       = 'A simple toolkit for working with XML.'
   spec.description   = 'A simple toolkit for working with XML.'
   spec.homepage      = 'https://github.com/saml-kit/xml-kit'
   spec.license       = 'MIT'
-  spec.required_ruby_version = '>= 2.2.0'
+  spec.required_ruby_version = '~> 2.4'
 
   spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
   spec.metadata['yard.run'] = 'yri'
@@ -24,12 +24,13 @@
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
   spec.add_dependency 'activemodel', '>= 4.2.0'
   spec.add_dependency 'builder', '~> 3.2'
-  spec.add_dependency 'nokogiri', '>= 1.8.5'
+  spec.add_dependency 'nokogiri', '~> 1.10'
   spec.add_dependency 'tilt', '>= 1.4.1'
   spec.add_dependency 'xmldsig', '~> 0.6'
+  spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_development_dependency 'bundler-audit', '~> 0.6'
   spec.add_development_dependency 'ffaker', '~> 2.7'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rubocop', '~> 0.52'