Upgrading to R version 2.15.3 under Fedora.

From time to time since the release of R 2.15.3 was announced
I have tried to upgrade from 2.15.2 by doing

     sudo yum install R

I keep getting

Package R-2.15.2-1.fc17.x86_64 already installed and latest version
Nothing to do

Has the upgrade really not propagated to the Fedora repositories yet?

Or is it the case that I am doing something wrong or that there is some
other action or adjustment required?

I am running Fedora 17.1.

Thanks for any hints.

     cheers,

         Rolf Turner