https://wccftech.com/apple-releases-homepod-software-version-13-4-8-heres-how-to-download/

Today, Apple has seen fit to release HomePod Software Version 13.4.8 alongside iOS 13.6, tvOS 13.4.8, and watchOS 6.2.8 to all users. The latest HomePod software update arrives two months after the HomePod 13.4.5 software update which included general improvements for stability and quality.

If you happen to own a HomePod, you can update the software to version 13.4.8 right now. According to Apple's release notes, the update boasts "general improvements for stability and quality." If you're unfamiliar, the HomePod software will be installed automatically on the HomePod. If it is not updated automatically, you can always perform the operation manually.