diff --git a/github-auth.gemspec b/github-auth.gemspec
index bc47f72..7045c44 100644
--- a/github-auth.gemspec
+++ b/github-auth.gemspec
@@ -19,13 +19,13 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 1.3'
-  spec.add_development_dependency 'rake'
+  spec.add_development_dependency 'cane', '~> 2.6.0'
+  spec.add_development_dependency 'cane-hashcheck', '~> 1.2.0'
+  spec.add_development_dependency 'coveralls', '~> 0.6.7'
+  spec.add_development_dependency 'rake', '~> 10.1.0'
   spec.add_development_dependency 'rspec', '~> 2.14'
-  spec.add_development_dependency 'cane'
-  spec.add_development_dependency 'cane-hashcheck'
-  spec.add_development_dependency 'coveralls'
-  spec.add_development_dependency 'sinatra'
-  spec.add_development_dependency 'thin'
+  spec.add_development_dependency 'sinatra', '~> 1.4.3'
+  spec.add_development_dependency 'thin', '~> 1.5.1'
 
-  spec.add_runtime_dependency 'httparty'
+  spec.add_runtime_dependency 'httparty', '~> 0.11.0'
 end