Cool new features and under-the-hood improvements get added to to React all the time. If your apps rely on React, you will find yourself at some point needing to update your version of React to something more recent. In some cases, you may want even downgrade your version of React to something older. This article will quickly run through how you can jump between versions of React on existing app really painlessly.
This is a companion discussion topic for the original entry at https://www.kirupa.com/react/updating_react_version.htm