I have MACOS High Sirerra, any updates compatible for this OS?

OK, 10.13.6 is as far as it can be upgraded, but some other more modern Apps for 10.13.6 may interest you..

The Free LibreOffice, it handles MS Office files like Word & Excel…

https://www.libreoffice.org/

This browser & link...

https://brave.com/

What are you trying to update to exactly?

If you might be trying to upgrade, what exact Mac do you have?