Macbook Pros have been in continuous production since 2006 and older model are restricted to older OS versions. We can neither see nor touch your computer and we are terrible at guessing! We must rely on you for details needed to give you more than a general answer.
To get specific help, please do "About this Mac..." from your Apple menu and tell us what SUB-MODEL you own.:
In macOS 10.9, the sub-model is the second line of text. The above example is for an iMac but the layout is the same for a MacBook Pro. Be sure to include any modifiers like Early, Mid, or Late. For some models those modifiers can be critical to establishing the upgrade path.
⚠️ For security reasons, please DO NOT post any serial numbers.
With that we can give you a detail upgrade path if available to your sub-model.
Thanks