structure.gemspec in structure-0.12.1 vs structure.gemspec in structure-0.12.2

@@ -16,9 +16,10 @@
 
   s.rubyforge_project = "structure"
 
   {
     'activesupport'  => '>= 3.0',
+    'rake'           => '~> 0.9',
     'rspec'          => '~> 2.6',
     'ruby-debug19'   => '~> 0.11.6'
   }.each do |lib, version|
     s.add_development_dependency lib, version
   end