diff --git a/chef-sugar.gemspec b/chef-sugar.gemspec
index bbfe093..ca19bd3 100644
--- a/chef-sugar.gemspec
+++ b/chef-sugar.gemspec
@@ -25,6 +25,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'rack', '~> 1.6'
   spec.add_development_dependency 'rake'
 
   spec.add_development_dependency 'chefspec',        '~> 4.2'