That was first noted today by MacRumors, which says that Apple has updated both pairs of truly wireless headphones to firmware version 3E751 as of today. Unfortunately, as is par for the course with a firmware update to the AirPods lineup, there is no specific way to see what’s new. If there is anything new at all.
However, if it becomes public knowledge what Apple did change, add, or fix, we will update this post accordingly.
As far as upgrading the firmware version of the AirPods/Pro is concerned, there’s no specific way to do this. The truly wireless headphones will handle the process automatically when they are connected to the iPhone, and the new firmware is available. However, if you want to try and force the update you can put the AirPods/Pro in the charging case, connect the case to a charging source (wireless or wired), and then pair the truly wireless headphones to your iPhone or iPad. That should kickstart the firmware update process. Hopefully.
You can check your AirPods/Pro firmware version at any time, though. Simply connect your truly wireless headphones, then open Settings –> Bluetooth –> “i” next to your AirPods and then read the number next to “Version”.
The new firmware should be available now, or should become available very soon if it isn’t already live.