title: How to fix "Your Ruby version is 1.9.3, but your Gemfile specified 2.0.0"
body: <p>I created a Ruby project, but when running <code>bundle update</code> and <code>bundle install</code> it returns an error:</p>
  
  <pre><code>Your Ruby version is 1.9.3, but your Gemfile specified 2.0.0
  </code></pre>
  
  <p>An image of it is: <a href="http://i.imgur.com/dZMhI11.png?1">http://i.imgur.com/dZMhI11.png?1</a></p>
  
  <p>My gemfile is:</p>
  
  <pre><code>ruby '2.0.0'
  #ruby-gemset=railstutorial_rails_4_0
  
  gem 'rails', '4.0.0'
  
  group :development do
      gem 'sqlite3', '1.3.8'
  end
  
  gem 'sass-rails', '4.0.0'
  gem 'uglifier', '2.1.1'
  gem 'coffee-rails', '4.0.0'
  gem 'jquery-rails', '3.0.4'
  gem 'turbolinks', '1.1.1'
  gem 'jbuilder', '1.0.2'
  
  group :doc do
      gem 'sdoc', '0.3.20', require: false
  end
  </code></pre>