diff --git a/openscap_parser.gemspec b/openscap_parser.gemspec
index 2e341da..efdcd97 100644
--- a/openscap_parser.gemspec
+++ b/openscap_parser.gemspec
@@ -37,6 +37,7 @@ Gem::Specification.new do |spec|
   spec.bindir        = 'bin'
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
+  spec.required_ruby_version = '>= 1.9.2'
 
   spec.add_dependency 'nokogiri', '~> 1.6'
   spec.add_development_dependency 'bundler'