Install latest nodejs version in ubuntu 14.04

This is the way I installed nodejs in ubuntu 14.04 LTS:

sudo add-apt-repository ppa:chris-lea/node.jssudo apt-get install nodejs

When I checked the node version with this:

node -v

I get this

v0.10.37

But the latest version is 4.2.6 and 5.5.0. How can I get the latest or update version?