Apple、デベロッパー向けに macOS Mojave 10.14.5 beta 4 (18F127a)、iOS 12.3 beta 4 (16F5148a)、watchOS 5.2.1 beta 4 (16U5110a)、tvOS 12.3 beta 4 (16M5146a)、
Apple TV Software 7.3 beta 3 (12H836)を配布開始
https://developer.apple.com/news/releases/