Upgrade only SQLServer, leaving SSRS at the old version

Hi all,

I have a SQLServer 2014 (12.0.2000.8) installation which includes the Reporting Services (SSRS).

Now I need to upgrade SQLServer to the 2016 SP2 version but I need also to leave the SSRS version as is. Is there any way to make thinks done? I tried running the SQLServer upgrade tool but it does not allow me to deselect the "Reporting services" flag during the wizard.

Thank you