price plan change not updated in Stripe dashboard?

End of video 'Recurring Subscriptions', tried changing the price plan:

$php artisan tinker

$p = App\Plan::skip(0)->first();

$p->price = 8100;

$p->save(); => 8100

and correspondingly when refreshed, the dropdown and modal refreshes to $81.00, but now checking Stripe latest payment, it is still $86.00, the previous amount?

What is going on?