Upgrade server OS to windows 2012 R2 containing System Center Products (2012R2)

I recently upgraded my SystemCenter suite from 2012 SP1 to R2.
My servers/products are currently on this level :

SCVMM 2012 R2 CU2 – Windows 2012 R2 update
SCDPM2012 R2 CU2 – Windows 2008 R2 SP1
SCOM2012 R2 CU2 – Windows 2008 R2 SP1
SCSM2012 R2 CU2 – Windows 2008 R2 SP1
SCSM2012 Datawarehouse R2 CU2 – Windows 2008 R2 SP1

I would like to upgrade my OS on those servers also, can I do this without further pre-tasks or are there special actions requered ?
Target is getting all of the servers to Windows 2012 R2 Update…