diff --git a/jekyll.gemspec b/jekyll.gemspec
index 729b46b1..558e3cd7 100644
--- a/jekyll.gemspec
+++ b/jekyll.gemspec
@@ -2,6 +2,7 @@ Gem::Specification.new do |s|
   s.specification_version = 2 if s.respond_to? :specification_version=
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.rubygems_version = '1.3.5'
+  s.required_ruby_version = '>= 1.9.2'
 
   s.name              = 'jekyll'
   s.version           = '1.3.1'