Ubuntu packages are pushed to new version (2.0.9) two days ago. Just fetch new version with standard:
apt get update && apt-get upgrade
I believe you need to check which version you're running.
box ~ # aptitude show php5-phalcon
Package: php5-phalcon
New: yes
State: installed
Automatically installed: no
**Version: 2.0.9-ppa1~trusty**
Priority: optional
Section: php
Maintainer: Phalcon PHP Team <[email protected]>
Architecture: amd64
On the other hand, if you compled it manually like I did for my instances, then just wget entire source again (or git clone it) and compile it again.