Rakefile in rack-datamapper-0.2.5 vs Rakefile in rack-datamapper-0.2.6

@@ -9,10 +9,10 @@
 require 'pathname'
 require 'yard'
 
 Hoe.spec('rack-datamapper') do |p|
   p.developer('mkristian', '[e-mail]')
-  p.extra_deps = [['dm-core', '>0.9.10']]
+  p.extra_deps = [['dm-core', ['>0.9.10', '<1.0.0']]]
   p.rspec_options << '--options' << 'spec/spec.opts'
 end
 
 desc 'Install the package as a gem.'
 task :install => [:clean, :package] do