NOTICE: ZenCache Minimum PHP Version

I got a notice that says I am running PHP v 5.3.9 but when I checked in CPanel it says that i am running 5.5.3.

Wondering what might cause this discrepancy. Just want to make sure nothing goes haywire on Dec. 1

Site: http://www.abhyasayogacenter.com/

Thanks for any help.

https://wordpress.org/plugins/zencache/