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#Use n module from npm in order to upgrade node

sudo npm cache clean -f
sudo npm install -g n
sudo n stable

sudo ln -sf /usr/local/n/versions/node/<VERSION>/bin/node /usr/bin/node 

#To upgrade to latest version (and not current stable) version, you can use
sudo n latest

#To undo:
sudo apt-get install --reinstall nodejs-legacy     # fix /usr/bin/node
sudo n rm 6.0.0     # replace number with version of Node that was installed
sudo npm uninstall -g n

#Found in David Walsh blog http://davidwalsh.name/upgrade-nodejs