Usage:
rvm upgrade {source ruby} [destination ruby] [--force]
Description:
Upgrades the specified (already installed) source ruby to the given destination ruby version. Will migrate gemsets, wrappers, aliases and environment files.
The process will prompt you at each stage - if the versions look incorrect, please cancel and perform it manually.
Examples:
$ rvm upgrade 1.9.2-p136 1.9.2-p180
$ rvm upgrade ree-2011.01 ree-2011-02
append --force to answer yes to all questions.
Experimental detection:
$ rvm upgrade 1.9.2
Are you sure you wish to upgrade from ruby-1.9.2-p290 to ruby-1.9.2-p318? (Y/n):