Should a button say "Upgrade subscription" or "Change subscription"?

It's a web app where you can change your subscription plan at any time. There are 5 subscription plans.

To change subscription you can directly go to pricing page or go to your profile settings. In the profile settings, there's a button that later takes you to the pricing page, where each plan in its turn has upgrade or downgrade button. I plan to leave these as they are.

Should a button in the profile settings say "Upgrade subscription" or "Change subscription"?

I'm inclined to go with "Upgrade subscription", but I'm not a native speaker and I'm not sure whether it would mean both upgrade/downgrade the account. Or will the user get confused and start looking for a "Downgrade account" button?

Should I just stay on the safe side and go with "Change subscription"?