我是否可以在不升级SQL Server的情况下将报表服务升级到报表服务2008 R2

I need to upgrade our RS 2008 server to RS 2008 R2. However, I cannot upgrade the SQL Server that it is currently using because SQL Server is on our Server Farm and we don't have authority on the farm. I need to upgrade our RS 2008 server to RS 2008