OS X 10.11.5 Beta
The OS X El Capitan 10.11.5 update improves the stability, compatibility, and security of your Mac. The build number is 15F18b.
tvOS 9.2.1 contains bug fixes and security improvements. The build number is 13Y5752a.
In addition, a profile on the developer portal is available to update Apple TV to tvOS 9.2.1 Beta seeds. If you have tvOS 9.1 Beta 1 or Beta 2 currently installed, please use the available .ipsw file to install tvOS 9.2.1 Beta 1. More details are available under Installation Instructions.
To install the latest version of watchOS 2.2.1 beta on an Apple Watch, download the watchOS 2.2.1 beta Configuration Profile. The build number is 13V413.