os: linux mint 17.2

$ nodejs -v => v0.10.25
$ node -v => v0.10.25
$ npm -v => 1.3.10

$ nvm ls => list available/installed local nodejs-versions
$ nvm ls-remote => see what versions are available to install
$ nvm install v4.2.1 => install und use specific nodejs-version

$ nvm use system => switch to system-version

links:
nvm