title: Gem::InstallError: nokogiri requires Ruby version < 2.4, >= 2.1.0. rails
body: <p>After running <code>rails new demo</code> I get the following error:</p>
  
  <pre><code>Gem::InstallError: nokogiri requires Ruby version &lt; 2.4, &gt;= 2.1.0.
  An error occurred while installing nokogiri (1.7.1), and Bundler cannot
  continue.
  Make sure that `gem install nokogiri -v '1.7.1'` succeeds before bundling.
  </code></pre>
  
  <p>My Ruby version is 1.9.3. I could update ruby but I'm worried that may create even more problems. Any suggestions?</p>
  
  <p>More Information:</p>
  
  <p>The Nokogiri gem is not listed in my Gemfile, if I run <code>gem list</code> it includes <code>nokogiri (1.6.8.1 x86-mingw32, 1.6.6.2 x86-mingw32, 1.6.1 x86-mingw32)</code></p>