Stripe Upgrade Issue

I'm having 2 plans Standard and Pro. Currently, I'm subscribed to Standard plan and want to upgrade the to the Pro plan
Expectation:
  • When switched to Pro, the Standard plan will automatically cancel and will not recharge in the future.
Actual:
-When switched to Pro, the Standard plan still active and Pro subscription newly created.

So how can I switch plan without creating new subscription.
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