How can I find out why a gem bundle has locked a gem at a specific version?

Question

I\'m trying to specify a version of the thrift gem in my gem file.

gem \'thrift\', \"~> 0.6.0\"

When I trying to run bundle install

Answer 1

Turns out just running bundle update thrift will show you what is locking the version:

$ bundle update thrift

Fetching source index for http://rubygems.org/
Bundler could not find compatible versions for gem "thrift":
  In Gemfile:
    evernote depends on
      thrift (~> 0.5.0)

    thrift (0.6.0)