Apple News
AirPods Firmware Updated to Version 3.5.1
Unfortunately, there does not appear to be any forward-facing changes for the user, so if you haven’t received the update just yet, there doesn’t appear to be any type of rush.
To deploy the new firmware, put your AirPods inside their case and close it, connect the case to a charger or a USB port on your computer, then wait for a couple of minutes. Your iPhone must be paired with your AirPods and connected to Wi-Fi in order for the firmware to download and install.
To see your current AirPods firmware version, open the charging case so the connected graphics appears on your iPhone, then tap Settings → General → About → AirPods.
[Img via Reddit]