https://wccftech.com/download-ios-12-4-beta-6-macos-10-14-6-beta-4-watchos-5-3-beta-5-released/

You can now download iOS 12.4 beta 6, macOS 10.14.6 beta 4 and watchOS 5.3 beta 5 if you are a registered developer.

We’re not huge fans of seeing loads of betas over a short period of time. But hey, they’re bound to arrive and more of them mean that Apple is really burning the midnight oil in order to keep things nice and smooth for everyone.