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As of RoR 4 release is coming soon, gems should support it to make migration very easy. :-)
Good news: Rails 4 is supported by this gem out of the box, but gemspec forbids it's installation in rails 4 app. So I've fixed it.
As a bonus I've added testing for all supported rails versions (see Travis build for this pull request).
On a local machine:
P.S> Thanks for a gem, that makes axlsx installation super easy!