Apple has posted watchOS 5.1, tvOS 12.1, and HomePod 12.1.
According to Apple, watchOS 5.1 includes the following improvements and bug fixes:
Apple Watch Series 4 automatically contacts emergency services if you are immobile for about a minute after detecting a hard fall. The watch will now also play a message that informs the responder that Apple Watch has detected a fall and shares your location coordinates when possible;
Fixes an issue that could cause an incomplete installation of the Walkie-Talkie app for some users;
Resolves an issue that prevented some users from being able to send or receive invitations on Walkie-Talkie;
Addresses an issue where some previously earned Activity awards were not showing in the Awards tab of the Activity app for some users.
You can install watchOS 5.1 by using the Watch app on your iPhone.
The tvOS update fixes some bugs. Fourth generation Apple TV or Apple TV 4K owners can nab the tvOS 11.2.1 update through the Settings menu.
HomePod 12.1 offers “general improvements for stability and quality.” The wireless speaker can update automatically on its own or you can manually prompt it to update in the Home app.