Hi,
Did you use the Office 2021 for Mac?
I suggest that you can update it individually, you can find the version that needs to be updated from this article:
https://video2.skills-academy.com/en-us/officeupdates/update-history-office-for-mac
Hope the information is helpful.
If the response is helpful, please click "Accept Answer" and upvote it. Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.