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Apple has rolled out its tvOS 15.4 update alongside the HomePod software 15.4 and third-generation Apple TV software updates.
Like many tvOS updates, this one is primarily focused on platform stability, bug fixes, and ecosystem improvements.
Updates to tvOS are generally incremental maintenance releases, adding support for products and services while also improving the experience in small ways. The build number for this release is19L440.
Apple has also added support for Captive WiFi networks. This allows users to use iPhone or iPad to connect an Apple TV to networks that need additional sign-in steps, like at hotels or dorms.
HomePod owners can update to the new HomePod software version 15.4 via the Home app settings menu. Apple also released a minor update for the third-generation Apple TV that uses pre-tvOS software.