Yes to give a straight answer the IP could change one day!
We cant stress it enough: please do not depend your entire work activities solely on our dedicated IP!
That being said, we try our best of keeping all of our IPs online and in our possession (and after 7+ years of service, fact is that in 90% of times it works out) but due to the nature of the risky and often abuse frequent VPN business, there are yet still many uncontrollable circumstances that can be leading to the possibility of losing an IP.
Just to name a few reasons:
[-] the server provider suspends our server
[-] incoming abuse complaints from spamhaus.org
[-] the server provider decides to remove the IP for whichever reason (please always remember: we do only rent the IPs and dont technically own them)
[-] the server provider nullroutes the IP (due to DDoS attacks, abuse or whatever else)
[-] any other events out of our control
Therefore (if necessary) always have a proper backup strategy for your work or at the very least additionally use a Dynamic DNS service in your setup so that incase the IP ever changes, atleast you will be able to continue your work on a new IP!
"Good" DDNS services are rare to find (and mainly depend on your planned activities) but for a legit use you could try for instance https://freedns.afraid.org or any other random Dynamic Domain service which you can find on google. In the end it's totally up to you and only you to take care of a possible backup solution beforehand and to decide whether you even need it or not, this article here is only to inform about the fact that a Dedicated IP could change.
Some further info about our different IP types can be found here