Updates for the Fitbit Sense and Versa 3 are coming out with a crucial security fix.

Fitbit is releasing an upgrade for the Sense and Versa 3 smartwatches, following the release of the Charge 5 and Luxe trackers last month.

The Versa 3 increases from 36.128.6. 12 to 36.128.6. 17, while the Fitbit Sense moves from 44.128.6. 12 to 44.128.6. 17. The Fitbit OS update list and this versioning both indicate an incremental patch.

However, Fitbit OS 4.2.3 is mistakenly listed in the new changelog entry for an update that affects the Sense and Versa 3 exclusively. The Versa, Versa 2, and Versa Lite Edition received that upgrade in March, while the Sense and Versa 3 ran Fitbit OS 5.x. Having said that, the information is undoubtedly fresh and should be accurate:

Having fixed that issue, the update is currently known as Fitbit OS 5.3.1:

This release includes significant security updates, enhancements, and bug fixes. How do I update my Fitbit device? has more details on security updates.

Fitbit Sense update
Fitbit Sense update

With Fitbit recommending , the emphasis is on a critical security upgrade that you should deploy right away:

The security update fixes a flaw that, if exploited, might jeopardize data security by potentially granting access to sensitive or secret information while preventing full code execution.

Previous releases merely mentioned improvements and bug fixes. We checked a Fitbit Sense this morning, and it has received this update. We haven’t noticed any other user-facing modifications in our limited usage.

Update: This afternoon, new firmware was released that addresses bug fixes, enhancements, and a crucial security update for the Charge 4 (1.100.76), Inspire 2 (1.124.76), and Ace 3 (1.134.76).

The security patch addresses a flaw that, if used, might give attacker-supplied programs full access and possibly go undetected by the user.
We advise you to apply a crucial update right away.
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