Last month, the second build of watchOS 4 was released for beta testing before Apple rolls out the OS upgrade to all Apple Watches this fall. Now, the third beta of the operating system is headed to developers for the same purposes. If your Apple Watch is registered under a Developer account, navigate to the Watch app on your paired iPhone and tap the “My Watch” tab. From there, go to General > Software Update and you should see the build ready for download. Be sure to place your iPhone on Wi-Fi while downloading this software as it’ll surely gobble up plenty of your data.
watchOS 4 includes new watch faces, improvements to fitness tracking, and more. We’ll update this article with any major changes worth noting found in the latest build.