title: How to update/upgrade a package using pip?
body: <p>What is the way to update a package using pip?
  those do not work:</p>
  
  <pre><code>pip update
  pip upgrade
  </code></pre>
  
  <p>I know this is a simple question but it is needed as it is not so easy to find (pip <a href="https://pip.pypa.io/en/stable/reference/pip_install/#options" rel="noreferrer">documentation</a> doesn't pop up and other questions from stack overflow are relevant but are not exactly about that)</p>