At the age of OpenShift Online 2 there was an ability to update Node.js to the latest version. As far as I can see, this approach doesn't work anymore for the new OpenShift Online 3 version. Currently, OpenShift offers only outdated or LTS versions of Node.js, e.g. v.4 or v.6.
How can I update the OpenShift Online 3 platform to the latest/current version of Node.js?
See this alternate S2I builder for Node.js.