diff --git a/tasks/gem.rake b/tasks/gem.rake
index 4ac10bdb2..7e2dc4f55 100644
--- a/tasks/gem.rake
+++ b/tasks/gem.rake
@@ -25,6 +25,7 @@ namespace :gem do
     s.add_runtime_dependency('json', '>= 1.1.9')
     s.add_runtime_dependency('extlib', '>= 0.9.15')
 
+    s.add_development_dependency('rack', '= 1.2.0')
     s.add_development_dependency('rake', '>= 0.7.3')
     s.add_development_dependency('rspec', '~> 1.2.9')
     s.add_development_dependency('launchy', '>= 0.3.2')