diff --git a/microformats2.gemspec b/microformats2.gemspec
index 9dc26ee..e8d1245 100644
--- a/microformats2.gemspec
+++ b/microformats2.gemspec
@@ -17,9 +17,9 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]
 
-  gem.add_runtime_dependency "nokogiri", "~> 1.5.6"
-  gem.add_runtime_dependency "json", "~> 1.7.6"
-  gem.add_runtime_dependency "activesupport", "~> 3.2.13"
+  gem.add_runtime_dependency "nokogiri", ">= 1.5.6"
+  gem.add_runtime_dependency "json", ">= 1.7.6"
+  gem.add_runtime_dependency "activesupport", ">= 3.2.13"
 
   gem.add_development_dependency "rake", "~> 10.0.0"
   gem.add_development_dependency "rspec", "~> 2.11.0"