audioOS 9.9.18.3 (build 22K557) is an official Apple over-the-air update for the HomePod, released on 2025-01-27T18:19:44Z. The update package is 715.09 MB. This is a delta (partial) update that requires 18.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: d8ad583557107313ce8684f7b1b24650c324091e.zip.