title: How do I revert to a previous package in Anaconda?
body: <p>If I do </p>
  
  <pre><code>conda info pandas
  </code></pre>
  
  <p>I can see all of the packages available.</p>
  
  <p>I updated my <code>pandas</code> to the latest this morning, but I need to revert to a prior version now. I tried</p>
  
  <pre><code>conda update pandas 0.13.1
  </code></pre>
  
  <p>but that didn't work. How do I specify which version to use?</p>