Buildr rubyzip version dependency prevents use of Warbler task

The newest Warbler requires rubyzip version >= 0.9.4 while buildr requires 0.9.1, so using the Warbler task causes the exception.

Gem::LoadError : can't activate rubyzip (>= 0.9.4, runtime) for ["warbler-1.2.1"], already activated rubyzip-0.9.1 for ["buildr-1.4.1-java"]

require 'warbler'
define 'proj' do
task :warble do
Warbler::Task.new
end
end