diff --git a/rest-client.gemspec b/rest-client.gemspec
index fea95b8..1001bb7 100644
--- a/rest-client.gemspec
+++ b/rest-client.gemspec
@@ -16,13 +16,14 @@ Gem::Specification.new do |s|
   s.homepage = 'https://github.com/rest-client/rest-client'
   s.summary = 'Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.'
 
-  s.add_dependency('mime-types', '~> 2.0')
   s.add_development_dependency('webmock', '~> 1.4')
   s.add_development_dependency('rspec', '~> 2.4')
   s.add_development_dependency('pry')
   s.add_development_dependency('pry-doc')
-  s.add_dependency('netrc', '~> 0.7.7')
-  s.add_dependency('rdoc', '>= 2.4.2')
+  s.add_development_dependency('rdoc', '>= 2.4.2', '< 5.0')
+
+  s.add_dependency('mime-types', '~> 2.0')
+  s.add_dependency('netrc', '~> 0.7')
 
   s.required_ruby_version = '>= 1.9.2'
 end
diff --git a/rest-client.windows.gemspec b/rest-client.windows.gemspec
index 3fcff5e..a2d2f17 100644
--- a/rest-client.windows.gemspec
+++ b/rest-client.windows.gemspec
@@ -12,7 +12,7 @@ platform = ENV['BUILD_PLATFORM'] || RUBY_PLATFORM
 case platform
 when /(mingw32|mswin32)/
   # ffi is needed for RestClient::Windows::RootCerts
-  s.add_dependency('ffi', '~> 1.9.3')
+  s.add_dependency('ffi', '~> 1.9')
   s.platform = platform
 end