title: Freezing Rails gem versions
body: <p>I am trying to freeze my Rails gem version as, day by day, some or the other gem version gets updated and sometimes I need to update the code.</p>
  
  <p>I tried <code>rake rails:freeze:gems</code> but this gave me error:</p>
  
  <pre><code>rake aborted!
  Don't know how to build task 'rails:freeze:gems'
  </code></pre>