Apple has not published in-depth release notes for tvOS 16.3.1 or HomePod software version 16.3.1. Instead, the company says: “Software version 16.3.1 includes general performance and stability improvements.”
Today’s updates come after tvOS 16.3 and HomePod software version 16.3 were released last month. For HomePod and HomePod mini users, the update included a number of major changes, including Siri improvements, new temperature and humidity sensor data, and more. Today’s updates likely focus on fixing some bugs and performance glitches related to those new features.
You can update your first-generation HomePod, second-generation HomePod, or your HomePod mini to software version 16.3.1 by going to the Home app on your iPhone, choosing your HomePod from the list of devices, and looking for the software update download.
You can update your Apple TV to tvOS 16.3.1 by going to the Settings app and choosing the Software Update menu.