Kolab 16 and newer version of php than 5.4

[Thomas Black]

Hi there,

I have installed Kolab 16 on CentOS 7.
Version of PHP is 5.4. I would like to update PHP to version 5.6,
because of security and also other web apps need that version. But it
seems that is impossible, because packages php-kolab and php-kolabformat
has dependency on php-common version 5.4.

Is there any possibility to update PHP to version 5.6 when I have Kolab
16 installed?
Really is Kolab 16 - latest stable version depended on php version 5.4
which end active support in 2014 and security fixes in 2015?

Thanks for any advice.
Thomas