torm.gemspec in torm-0.2.0 vs torm.gemspec in torm-0.2.1

@@ -17,15 +17,15 @@
   spec.executables           = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files            = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths         = ['lib']
 
   # Ruby 2.1 introduces required named keywords
-  spec.required_ruby_version = '>= 2.1.0'
+  spec.required_ruby_version = '~> 2.1'
 
   # MultiJson follow Semantic Versioning, so any 1.x should work.
   spec.add_dependency 'multi_json', '~> 1.0'
 
   # Defaults from generating the gemspec
-  spec.add_development_dependency 'bundler', '~> 1.7'
-  spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'minitest'
+  spec.add_development_dependency 'bundler', '>= 1.7', '< 3.0'
+  spec.add_development_dependency 'rake', '~> 12.3'
+  spec.add_development_dependency 'minitest', '~> 4.0'
 end