Apple today informed developers that starting on June 1, 2016, all watchOS apps submitted to the App Store must be native apps built with the watchOS 2 SDK or later.

When the Apple Watch first launched, watchOS apps were reliant on the iPhone to run on the Apple Watch, but with watchOS 2, Apple introduced support for native apps. With native app support, developers can build apps that are able to run on the Apple Watch, allowing apps to open more quickly and work more smoothly.

Apple's June 1 deadline for native apps hits two weeks before the company's Worldwide Developers Conference, where it is expected to show off new versions of iOS, OS X, watchOS, and tvOS.