By default, HomePod and HomePod mini automatically install new software updates, but you can manually check for updates in the Home app on your iPhone, iPad or Mac.
- Make sure your device is updated to the latest version of iOS, iPadOS or macOS.
- Open the Home app.
- Tap or click the More button
, then Home Settings 
> Software Update. - If there's a new update, select Update. If there isn't a new update, you can select HomePod to turn on automatic updates and get the latest software automatically when it's available. Software Update will also tell you if your HomePod is already up to date, and show you the installed HomePod software.
A white spinning light appears on the top of HomePod while it's updating. The update might take some time. Make sure that your HomePod stays plugged in while it's updating.