Apple today released tvOS 15.5 Beta to developers, version number 19L5547e, coming out in three weeks after the release of tvOS 15.4.
Developers can download the new tvOS 15.5 beta by downloading configuration files to Apple TV using Xcode.
Updates to tvOS are usually small in scale and focus on bug fixes and improvements rather than major external-facing changes.
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Apple previously released the official version of tvOS 15.4, the current stable version of tvOS, which added support for proprietary WiFi networks, allowing Apple TVS to be connected from aN iPhone or iPad to networks that require additional login steps, such as hotel rooms and college campuses.