https://learn.microsoft.com/en-us/officeupdates/current-channel 未更新明日の定例更新までおあずけ
4/10 追記
https://learn.microsoft.com/en-us/officeupdates/current-channel#version-2403-april-09
Release notes for Microsoft Office security updates
追記終わり
https://learn.microsoft.com/en-us/officeupdates/current-channel-preview は Version 2404 (Build 17531.20004) に更新