You won’t see any difference after updating to today’s release, but it is important.
With this release, we have updated our version of the Firebase Database API. Firebase (owned by Google) is the service we use to instantly backup and sync all your data. This online backup ensures that even if your phone was lost of broken tomorrow, you won’t lose your to-do list. It’s also how instant sync between multiple devices is possible.
The second change is we have enhanced our security rules for your online data.