Your Ruby version is 2.0.0, but your Gemfile specified 2.1.0

When I try to bundle install I get the following message:

Your Ruby version is 2.0.0, but your Gemfile specified 2.1.0

In my Gemfile I have the following:

ruby '2.1.0'

And when I run ruby -v in the console I get:

ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin12.0]

What does Ruby 2.1.0p0 mean? What version should I have in my Gemfile and why does the error tell me I have Ruby version 2.0.0?

Solution 1:

Run

gem install bundler

or

gem update bundler 

which may fix your problem.

For all new installed versions of Ruby you should update or install a new bundler.

Solution 2:

In the top-level directory of your project, create a file named .ruby-version containing (wait for it...)

2.1.0

That apparently is the cross-{rbenv,rvm} way of spec'ing the version now.

Solution 3:

If you get this in a Rails project, and you recently upgraded your Ruby version you might have spring still running with the old version of Ruby.

./bin/spring stop

will fix this.