title: How to correctly update system ruby version to latest version (2.2.1) on OSX
body: <p>Just trying to update to the latest version of Ruby. On ruby-lang.org/en/documentation/installation/#homebrew, I found that you should be able to do it via homebrew:</p>
  
  <pre><code>brew install ruby
  </code></pre>
  
  <p>However, when I listed the ruby version (ruby -v) after it 'updated' it was still at the old version 2.0.0.</p>
  
  <pre><code>Hermes:~ Sancho$ ruby -v
  ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin13]
  </code></pre>
  
  <p>I happened to list the contents of /usr/local/bin/ and I could see a symbolic link:</p>
  
  <p>ruby -> ../Cellar/ruby/2.2.1/bin/ruby</p>
  
  <p>So, I don't know what's happening and why the version still lists the old number and not 2.2.1, as it looks like it should.</p>
  
  <p>There are sym links to for various other ruby tools (erb, gem, irb, rake, rdoc, ri) to version 2.2.1 also.</p>
  
  <p>So what is happening here and how do I correctly install version 2.2.1?</p>
  
  <p>I do have RVM installed also, but I want to update the system version of ruby to the latest.</p>