audioOS 9.9.18.5 (build 22L572) is an official Apple over-the-air update for the HomePod, released on 2025-05-12T17:13:14Z. The update package is 2 GB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 43cbb296763b4aeb2dd93d04e1f9237bf2db089a.zip.