audioOS 9.9.18.3 (build 22K557) is an official Apple over-the-air update for the HomePod, released on 2025-01-27T18:19:39Z. The update package is 1.79 GB. This is a delta (partial) update that requires 15.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: fb3b4034adef56e96cf4bf32b8cfa827c431126e.zip.