The Dropified Chrome Extension will auto update when you restart Chrome, but you can follow these steps to force an update:

Right-click on Dropified extension icon in Chrome and choose Manage Extensions, or copy/paste the following URL into Chrome URL bar and press Enter.
​chrome://extensions/?id=aogkkekoinpipjlolpcicigndjlcpdcn

Enable Developer Mode and click Update: 

That's it! Dropified extension should now be updated.