diff --git a/api_smith.gemspec b/api_smith.gemspec
index 21aa8fc..b0311eb 100644
--- a/api_smith.gemspec
+++ b/api_smith.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = ">= 1.3.6"
 
   s.add_dependency 'httparty'
-  s.add_dependency 'hashie',   '>= 1.0', '< 3.0'
+  s.add_dependency 'hashie',   '>= 1.0', '< 4.0'
 
   s.add_development_dependency 'rr'
   s.add_development_dependency 'rspec', '~> 2.0'