private_attr.gemspec in private_attr-1.1.0 vs private_attr.gemspec in private_attr-2.0.0

@@ -16,8 +16,9 @@
   gem.files         = `git ls-files`.split($/)
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
+  gem.add_development_dependency 'bundler'
   gem.add_development_dependency 'minitest', '~> 5.0'
-  gem.add_development_dependency 'rake',     '~> 10.0'
+  gem.add_development_dependency 'rake',     '~> 12.3.3'
 end