First time use, warning "Your server needs to update"

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Nextcloud version: 23.0.3
Client Operating system and version: Ubuntu 18.04 (Zorin)
Server Operating system and version: Debian 11
Apache: 2.4.53
PHP version: 8.0.17

The issue you are facing:
I’ve created my first document. Having surmounted the issue where the document would download instead of opening, I’m now faced with a little banner at the bottom (of my document window) which states “Your server needs to update.” What’s this about?

Do I really need to update? If so, how? I just installed it all last week - NextCloud, CODE, etc.