Setting Node version for Rails apps
Choosing which version of Node is installed with your Rack.. applications
Controlling the Node version for your Rails application
We automatically install the latest release of Node version when we set up your Rack/Rails application servers. You can control which version is installed by editing the manifest file for the Rails application.
Applying changes
To apply changes to the Node version you need to update your manifest file, then deploy-with-options and select the Apply Ruby/Node upgrades option.