Unable to install on Rails 3.2.13

[spheregenomics]

$ bundle

Bundler could not find compatible versions for gem "activerecord":
  In Gemfile:
    make_flaggable (>= 0) ruby depends on
      activerecord (~> 3.0.0) ruby

    rails (= 3.2.13) ruby depends on
      activerecord (3.2.13) 

[licatajustin]

+1

[StarWar]

+1

[gary1410]

+1

Is the Gem out of date? There was a last commit around may?