diff --git a/omniauth.gemspec b/omniauth.gemspec
index 7797871..0b1f1f8 100644
--- a/omniauth.gemspec
+++ b/omniauth.gemspec
@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'omniauth/version'
 
 Gem::Specification.new do |spec|
-  spec.add_dependency 'hashie', ['>= 1.2', '< 3.1']
+  spec.add_dependency 'hashie', ['>= 1.2', '< 4']
   spec.add_dependency 'rack', '~> 1.0'
   spec.add_development_dependency 'bundler', '~> 1.0'
   spec.authors       = ['Michael Bleigh', 'Erik Michaels-Ober', 'Tom Milewski']