diff --git a/rails.gemspec b/rails.gemspec
index dea075effe..8b9a374e25 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -7,6 +7,7 @@ Gem::Specification.new do |s|
   s.summary     = 'Full-stack web application framework.'
   s.description = 'Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration.'
   s.required_ruby_version = '>= 1.8.7'
+  s.required_rubygems_version = ">= 1.3.6"
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'