What is the proper way to update C-Lightning? I downloaded the latest github .zip for version 0.6 and unpacked it but when I check the version I am running it returns:

v0.5.2-2016-11-21-1644-g1616fcb


Any idea what I did incorrectly? What's the proper way to update C-Lighting from the terminal in Ubuntu?
I just deleted the original folder and installed from scratch.