title: How does one upgrade a specific ruby gem to a specific (or the latest) version?
body: <p>I am trying to upgrade a gem (<code>hydra-derivatives</code>) to version <a href="https://rubygems.org/gems/hydra-derivatives" rel="noreferrer">3.3.2</a> to see if it solves a bug we are having.</p>
  
  <p><strong>hydra-derivatives</strong> is not a <strong>Gemfile</strong> gem; it's bundled as a dependency of another gem, called <code>hydra-works</code>.</p>
  
  <h1>What I've Tried</h1>
  
  <ol>
  <li><a href="http://bundler.io/blog/2017/03/28/bundler-1-14-so-many-fixes.html" rel="noreferrer"><code>bundle update --conservative
  hydra-derivatives</code></a> but that only upgraded hydra-derivatives to
  3.2.2 (&amp; we want 3.3.2) and its dependency <code>mini_magick</code> from 4.5.1 to 4.8.0</li>
  <li><p>adding <code>gem 'hydra-derivatives', '~&gt; 3.3.2'</code> but that gave me:</p>
  
  <pre><code>You have requested:
    hydra-derivatives ~&gt; 3.3.2
  
  The bundle currently has hydra-derivatives locked at 3.2.1.
  Try running `bundle update hydra-derivatives`
  
  If you are updating multiple gems in your Gemfile at once,
  try passing them all to `bundle update`
  </code></pre></li>
  <li><p>I don't want to run <code>bundle update hydra-derivatives</code> because I don't want it to update a bunch of unnecessary gems and cause problems, hence why I read about <code>--conservative</code></p>
  
  <p>a. I ran this anyway to test it, and it upgraded target gem to only 3.2.2 and 15 gems in total!</p></li>
  </ol>