MacRumors published a story that Apple has released HomePod 16.5 Software.
Apple Releases HomePod 16.5 Software
Alongside the iOS 16.5, iPadOS 16.5, tvOS 16.5, and macOS Ventura 13.4 updates, Apple has released new 16.5 software created for the HomePod and HomePod mini.
Apple Releases HomePod 16.5 Software
According to Apple's release notes, the update adds stability and performance improvements to the HomePod.