Key1 is about to expire

We are using an old version of OFTP Server (2013, build 89). We have recently started getting warnings that "Key1 will expire 10.august 2019". Key1 is a self signed certificate and I guess it is not used in production, but I need to make sure the system will not stop working. Can we safely ignore the warning? We are postponing OFTP upgrade as long as we can, why change a working system, right?



I created a new self-signed certificate yesterday and tried updating the partner using the old (soon to expire cert) with the new one. Worked flawlessly in our case.