https://wccftech.com/ios-12-3-beta-5-now-available-for-iphone-and-ipad-users-devs-only/

It’s beta day! Apple has released iOS 12.3 beta 5 for registered iPhone and iPad developers and you can grab the software update over the air.

While we are surrounded in the noise of Google I/O 2019, Apple sees it fit to release a barrage of new betas for its software lineup. One of those betas is for iOS 12.3 and registered developers can casually download it over the air as long as they have the previous beta installed on their devices.