Do you use rbenv-aliases?

[JunichiIto]

In the sample application, every .ruby-version file is written as "2.0.0" but I think such a version does not exist. So I had to update .ruby-version for each branch.

But today I found rbenv-aliases plugin. I guess you use this plugin in order to make "2.0.0" available. If so, it is worth mentioning it in the book or README.

[ruralocity]

I use RVM, and at least until recently using a version without a patch level worked fine. I'm running into a similar problem elsewhere. If I can't resolve it soon I'm apt to either declare the Ruby dependency in the Gemfile, Heroku-style, or remove it entirely.

[JunichiIto]

declare the Ruby dependency in the Gemfile

I think it might be good alternative.

[ruralocity]

It looks like rbenv does not support specifying the Ruby version in the Gemfile, and won't. I'm going to do some research on how similar tutorials handle Ruby versions.