Can I update to version 2.02 with ppa?

sudo apt-add-repository ppa:phalcon/stable
sudo apt-get update
sudo apt-get install php5-phalcon

I installed 2.01 as the above instructions,

sudo apt-get update
sudo apt-get upgrade

I upgrade my system, but it remains 2.01

It seems the PPA needs to be updated, I'll contact the author, meanwhile you can install from source:

git clone git://github.com/phalcon/cphalcon.git
cd cphalcon/build
sudo ./install