diff --git a/rails.gemspec b/rails.gemspec
index ccbc70ac56..ba94354bf1 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -26,6 +26,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'actionmailer',  version
   s.add_dependency 'railties',      version
 
-  s.add_dependency 'bundler',         '~> 1.2.2'
+  s.add_dependency 'bundler',         '>= 1.2.2', '< 2.0'
   s.add_dependency 'sprockets-rails', '~> 2.0.0.rc1'
 end