Fitbit has started distributing version 5.3 of its OS to the Sense and Versa 3. Arriving as 44.128.6.12 for the Sense and 36.128.6.12 for the Versa 3, Fitbit OS 5.3 contains several new features, including outdoor exercise modes.
https://www.notebookcheck.net/Fitbit-Sense-and-Fitbit-Versa-3-receive-quality-of-life-improvements-with-Fitbit-OS-5-3.576092.0.html