A little more than one week after Apple released iOS 9.2 to the public, the Cupertino firm has unleashed the first beta version of its next software update.

iOS 9.2.1 beta 1 is now rolling out to registered iOS developers. The update is build 13D11 and is available to the same devices that can run iOS 9. Those include the iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, the fifth and sixth generation iPod touch models, and most iPads.

As of this writing, it doesn’t appear that iOS 9.2.1 beta 1 is going out to Apple Beta Software Program users. 

Exactly what’s inside iOS 9.2.1 is still a mystery. Considering that it’s an x.x.1 update, though, there probably aren’t any major new features in there. Instead, it probably includes some bug fixes and performance improvements to tighten up iOS.