i need to uptade my mac pro

You have provided almost no information about your computer and this makes it very hard to answer your question.

http://www.apple.com/itunes/download/

Please identify with details which build year model Apple computer, by name

and model identification number; you can locate information to use to search

online about your computer by looking in About This Mac in the Finder menu.

The 'more info' button will open a utility that shows Hardware spec & software.

The MacPro (if that is what you have; some say that when they have MacBook/Pro)

has been around in name awhile. The older models look like aluminum PowerMac

tower desktop units, except there was a transition from PowerPC CPU to Intel; so

the case looks like the older model yet inside is a different architecture. The last

Mac Pro is a black cylinder-shape that looks like a cooling tower.

There were no MacPro models back in the early OS X days; so your identification

of the Operating System would also be helpful. You can use an online identification

page, to identify by serial number or model; the Serial Number identification is best.

Do not post your product serial number or other personal identifiers here.

• Mac Serial Number Info - Lookup your Apple product Serial Number:

https://www.powerbookmedic.com/identify-mac-serial.php

This page will show the details about your build model, where/when manufactured;

and yet not anything further you may have added to it since it was new...

As there are other ways to identify build model, see add'l sources of information:

https://duckduckgo.com/?q=identify+Mac+Pro&t=ffsb&ia=web

In any event...

Good luck & happy computing! 🙂