Apple、デベロッパー向けにmacOS 12.3 beta 5 (21E5227a)、iOS 15.4 beta 5 (19E5241a)、iPadOS 15.4 beta 5 (19E5241a)、watchOS 8.5 beta 5 (19T5241a)、tvOS 15.4 beta 5 (19L5440a)を配布開始
https://developer.apple.com/news/releases/