Apple has recently released a new software update for the HomePod and HomePod mini. Update 16.0 does not bring any new significant features. This update only includes general performance and stability improvements.
The update will be installed automatically if you have automatic updates enabled, or you will receive a notification that a new update is available.
One of the new things you may see after the update is enabling you to receive Beta updates. If you want your HomeKit and Home Hub to work as expected, you should keep this off.
After the update, you may be asked to sign in to your Apple Music to use in your HomePod or HomePod mini.
The size of the update is 467.7 MB