Apple、デベロッパー向けにmacOS 12.5 beta (21G5027d)、iOS 15.6 beta (19G5027e)、iPadOS 15.6 beta (19G5027e)、watchOS 8.7 beta (19U5027c)、tvOS 15.6 beta (19M5027c)を配布開始
https://developer.apple.com/jp/news/releases/