title: Mac/Homebrew - changing Node version does not change NPM version
body: <p>On my Mac, I'd like to use Homebrew to install an earlier version of Node and NPM - I'm currently running Node/NPM <code>8.2.1/5.3.0</code>, and I'd like to switch to <code>6.11.2/3.10.10</code>, as listed in the <a href="https://nodejs.org/en/download/releases/" rel="nofollow noreferrer">documentation</a>.</p>
  
  <p>I ran</p>
  
  <pre><code>$ brew install node@6
  $ brew unlink node
  $ brew link node@ --force
  </code></pre>
  
  <p>and while this appears to change my node version - <code>$ node -v</code> -> <code>6.11.2</code> - my version of NPM is still stuck at <code>5.3.0</code>.</p>
  
  <p>How can I switch NPM to this other version (and switch it back, if need be)? </p>