Unfortunately nodejs is no longer maintained via an installation of apt-get install on the raspberry PI. Please use below instructions for the installation.
Be sure that you first remove the old one:
sudo apt-get remove nodejs
Then check on the nodejs site the latest version: https://nodejs.org/dist/latest/
In my case it is: node-v6.0.0-linux-armv7l.tar.gz
For the RPi1 use should use armv6l.tar.gz
Now it’s time to download and install.
wget https://nodejs.org/dist/latest/node-v6.0.0-linux-armv7l.tar.gz tar -xvf node-v6.0.0-linux-armv7l.tar.gz cd node-v6.0.0-linux-armv7l sudo cp -R * /usr/local/
Your done! Now check that it is working by node -v