diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 299db08..67cc3c9 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -27,8 +27,11 @@
 
   s.require_paths = %w[lib ext]
 
-  s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec', '~> 2.10.0'
-  s.add_development_dependency 'mongrel', "1.2.0.pre2"
+  s.add_development_dependency "rack", "~> 1.5.2"
+  s.add_development_dependency "rack-test", "~> 0.6.2"
+  s.add_development_dependency "thin", "~> 1.5.0"
+  s.add_development_dependency "bundler", "~> 1.3.1"
+  s.add_development_dependency 'rake'
 end