I can upgrade my Raspberry with Raspberry Pi 2 or 3?

I have a Raspberry Pi since 3 years by your datacenter. Your services are very good and will be happy to renew the subscription for the next period of 12 monts. So, I am interested whether I can upgrade my Raspberry with Raspberry Pi 2? Have I to buy another one, or I can pay the excess for the new one?
Is there any option to upgrade with the new version of Pi?
Thank you.
the best solution is to buy new RPi2 or even RPi3 with full order. You will get new IP and new device. We can send you your old RPi. A shipping is about €5 - it depends on destination. 


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