As a verb:
* I upgraded my phone to the latest model.
* The company is upgrading its software to improve security.
* We upgraded our seats on the airplane to first class.
As a noun:
* The new software is a significant upgrade over the old version.
* For an extra fee, you can get an upgrade to a room with a balcony.
* My boss offered me an upgrade to a more senior position.
In different contexts:
* Technical: The engineer recommended an upgrade to the server's hardware.
* Business: The company decided to implement a major upgrade to its customer service system.
* Personal: I'm thinking about getting an upgrade on my gym membership to include access to more classes.