diff --git a/spec/dummy/Gemfile b/spec/dummy/Gemfile
index 089774a..665963a 100644
--- a/spec/dummy/Gemfile
+++ b/spec/dummy/Gemfile
@@ -2,18 +2,18 @@ source 'https://rubygems.org'
 
 gem 'activerecord', '~> 4.0.0'
 gem 'activeresource', '~> 4.0.0'
-gem 'actionmailer', '~> 4.0.0'
-gem 'railties', '~> 4.0.0'
+gem 'actionmailer', '~> 5.0.0'
+gem 'railties', '~> 5.0.0'
 
 gem 'sqlite3'
 
 gem 'carrierwave'
 gem 'fog'
-gem 'kaminari'
-gem 'plupload-rails'
+gem 'kaminari', '>= 0.16.0'
+gem 'plupload-rails', '>= 1.2.0'
 
-gem 'haml-rails'
-gem 'jquery-rails'
-gem 'sass-rails'
+gem 'haml-rails', '>= 0.6.0'
+gem 'jquery-rails', '>= 4.0.1'
+gem 'sass-rails', '>= 5.0.5'
 gem 'bootstrap_sass_rails'
-gem 'simple_form'
+gem 'simple_form', '>= 3.2.1'