rbenv can't change global ruby version

Question

My Mac OS X has a default ruby.

$ ruby -v
ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]

I installed rbenv and ruby ver

Answer 1

Type $ rbenv version (without "s")

It is possible that output will show a path to the file that is locking the version

2.0.0p451 (set by /path/to/some/directory/.ruby-version)

It is even possible that the file is a hidden file named .ruby-version in your current dir. If its the case just remove that .ruby-version file