diff --git a/rails.gemspec b/rails.gemspec
index 878a342903..b44dc27cb0 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -14,6 +14,7 @@
   s.add_dependency('activeresource',   '= 3.0.pre')
   s.add_dependency('actionmailer',     '= 3.0.pre')
   s.add_dependency('railties',         '= 3.0.pre')
+  s.add_dependency('bundler',          '>= 0.9.0.pre')
 
   s.rdoc_options << '--exclude' << '.'
   s.has_rdoc = false