Admins should test the version thoroughly locally (or on staging) for their systems from the Downloads screen, before making the changes globally, (or on production) for the end-users, from the Client Version screen.
Step 1: Go to the Client Version screen. From the drop-down menu, select the latest version to upgrade to.
Step 2: Check the following box and click onUpgrade Nowto start the up-gradation process.
Note that more than one environment can be upgraded at once.