If you are running R on Windows,
there is the package installr which will help you with the process
of upgrading.

And item 2.8 in the R for Windows FAQ has some information about upgrading also.
> On 25 Jul 2015, at 06:41, Waqas Shafqat <waqas1...@gmail.com> wrote:
> 
> Dear sir,
> 
> I am using currently R 3.1.3. But i wnat to upgrade this version to R 3.2.0
> but i am feared that the libraries which i have installed may be remove?
> please guide me.
> 
> thanks
> --
> Waqas Shafqat Chattha
> Ph. D Scholar
> Department of Plant Breeding and Genetics
> University of Agriculture, Faisalabad
> Pakistan
> 
>       [[alternative HTML version deleted]]
> 
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