In my Gemfile I specified ruby version 2.0.0:
ruby '2.0.0'
But my console tells me I have 2.1.0dev:
$ ruby -v
ruby 2.1.0dev (2013-09-16 trunk 42951) [x86_64-darwin12.4.0]
I am using rbenv and it tells my I don't have 2.1.0 installed,
$ rbenv versions
system
* 2.0.0-dev
Bundle update or bundle install says:
"Your Ruby version is 2.1.0, but your Gemfile specified 2.0.0"
but using 'rbenv local 2.0.0-dev' leaves me with ruby 2.1.0dev again. Furthermore:
$ rbenv global
2.0.0-dev
$ cat ~/.bash_profile:
export PATH="$HOME/.rbenv/bin:$PATH"
if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi
As far as I know, 2.1.0dev doesn't even exist yet.
How can i get ruby 2.0.0 selected?
You may need to update your version of ruby-build to make sure you have the update where ruby-2.0.0-dev switched to follow the ruby_2_0_0 branch.
Try running ruby-build --version and make sure it's one of these (or later):
- v20130907
- v20130901
- v20130806
- v20130628
- v20130518
- v20130514
- v20130501
- v20130408
- v20130227
- v20130226
- v20130225
If not, run brew upgrade ruby-build.
Go to your Gemfile and change the description there I just got the same problem and couldn't find a "working" solution. So I made my own.
source 'https://rubygems.org'
ruby '2.0.0' #Change this one to this '2.1.0'
gem 'rails', '4.0.3'
来源：https://stackoverflow.com/questions/18837415/your-ruby-version-is-2-1-0-but-your-gemfile-specified-2-0-0