updateR is not currently on CRAN. To install it, you can use the devtools package:
install.packages("devtools")
devtools::install_github("yaccos/updateR")To update R, run updateR() with your system password. The function will display the version that R has been updated to when it finishes. previously installed packages will be installed back from CRAN and Bioconductor, ( this may require time)
To find out more on updateR, see the dedicated blog post: https://andreacirilloblog.wordpress.com/2015/10/22/updater-package-update-r-version-with-a-function-on-mac-osx/