master branch not working with Rails 5.0

[djsegal]

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I'm getting the following error when I use gem 'annotate', github: "ctran/annotate_models"

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Bundler could not find compatible versions for gem "activerecord":
  In snapshot (Gemfile.lock):
    activerecord (= 5.0.0.alpha)

  In Gemfile:
    friendly_id (~> 5.1.0) ruby depends on
      activerecord (>= 4.0.0) ruby

    rails (>= 0) ruby depends on
      activerecord (= 5.0.0.alpha) ruby

    annotate (>= 0) ruby depends on
      activerecord (<= 4.3, >= 3.2) ruby

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

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