❤ Fitbit Sense and Versa 3 update rolling out with ‘important’ security fix



Following the Charge 5 and Luxe trackers last month, Fitbit is rolling out an update to the Sense and Versa 3 smartwatch.

The Fitbit Sense is going from to, while the Versa 3 jumps to This versioning suggests an incremental patch and the Fitbit OS update list says as much.

What’s changed in the latest Fitbit OS update?

Updates to Fitbit OS provide new features, improvements, and bug fixes for your Fitbit watch.

However, the new changelog entry for an update that’s “Sense and Versa 3 only” is misidentified as Fitbit OS 4.2.3. That was a previous update from March for the Versa, Versa 2, and Versa Lite Edition, with the Sense and Versa 3 notably running Fitbit OS 5.x. That said, the contents are clearly new and should be accurate:

That error has been addressed and the update is now referred to as Fitbit OS 5.3.1:

This release includes bug fixes, improvements, and an important security update. For more information about security updates see How do I update my Fitbit device?







The emphasis is on an “important security update,” with Fitbit recommending that “you apply an important update immediately”:

The security update patches a vulnerability that, if exploited, could compromise data security, potentially allowing access to confidential or sensitive data but stopping short of full code execution.

Past releases only noted bug fixes and improvements. This update is rolled out to a Fitbit Sense we checked this morning. In our brief usage, we’ve yet to spot any other user-facing changes.

Update: Meanwhile, there’s also new firmware for the Charge 4 (1.100.76), Inspire 2 (1.124.76), and Ace 3 (1.134.76) this afternoon that addresses “bug fixes, improvements, and a critical security update.”

The security update patches a vulnerability that, if exploited, could allow attacker-supplied code to gain unrestricted access and potentially go undetected by the customer.

We recommend that you apply a critical update immediately.