Etherpad installation

NethServer Version: 7.9.2009

I want to run Etherpad-lite on my NS. I have created new virtualhost for it, clone from git, but when i want run Etherpad, it need newer version of nodejs.
ERROR: Your nodejs version “8.17” is too old. nodejs 10.13.x or higher is required.
I can´t find how to update nodejs.

Thanks for help.