firmware version 3.7.2 with some bug fixes and improvements.
and update your AirPods software firmware version right from your iPhone, iPad
version is easy and is little different than iPhone/iPad software update.
updated AirPods firmware when they are paired to an iPhone and
connected to internet connectivity. There is no manual method yet for software
update of AirPods firmware so Apple might bring some technique to update
AirPods firmware manually or with OTA in the coming future.
your AirPods firmware version in Settings → General → About →
AirPods on your iPhone/iPad when the earbuds are connected.