I could not find a "direct" answer to this anywhere. Since I know there will be many other "Late Upgraders" to the party, I feel I need to get this out.
I had a Rails 4.0.0 app running Ruby 2.0.0-p247. After upgrading to 4.0.13, I ran into this error:
private method `include' called for ActionDispatch::Assertions:Module (NoMethodError)
I received this through rspec and WEBrick.