Cumulative Update 5 for Exchange Server 2013 (KB2936880)

Hi,

i have installed exchange server 2013 on separate servers, I deployed the Mailbox role on the first server, and the CAS role on the second server.

I checked the edition using the exchange management shell on the mailbox server and on the CAS server:

>>>

[PS] C:\Windows\system32>Get-ExchangeServer | fl name,edition,admindisplayversion

Name                : EXMBX
Edition             : Standard
AdminDisplayVersion : Version 15.0 (Build 516.32)

Name                : EXCAS
Edition             : Standard
AdminDisplayVersion : Version 15.0 (Build 516.32)

<<<

My question is, is it possible to update this current edition to the "Cumulative update 5 for Exchange Server 2013 (KB293688) ?

if it is, in my case, on which servers should i install this update ? on the Mailbox server ? or on the CAS server ?

i appreciate you fast response,

Thanks.