node.js - How can I update NodeJS and NPM to the next versions?

I just installed Node.js and
npm (for additional
modules).

How can I update Node.js and the
modules which I'm using to the latest
versions?

Can npm do
it, or do I have to remove and reinstall Node.js and npm to get the next
versions?

I followed href="https://github.com/nodejs/node/wiki/Installation"
rel="noreferrer">this steps in the npm
section.