diff --git a/jasmine-headless-webkit.gemspec b/jasmine-headless-webkit.gemspec
index 56d70af..72077d4 100644
--- a/jasmine-headless-webkit.gemspec
+++ b/jasmine-headless-webkit.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
+  s.required_rubygems_version = ">= 1.8.0"
 
   s.add_runtime_dependency 'jasmine-core', '~> 1.1'
   s.add_runtime_dependency 'coffee-script'