diff --git a/lib/couchrest_extended_document.rb b/lib/couchrest_extended_document.rb
index aa9e5e7..d256be4 100644
--- a/lib/couchrest_extended_document.rb
+++ b/lib/couchrest_extended_document.rb
@@ -5,7 +5,7 @@ gem 'couchrest'
 
 require 'couchrest'
 
-require 'activesupport'
+require 'active_support/core_ext'
 require 'mime/types'
 require "enumerator"
 
diff --git a/spec/couchrest/extended_doc_inherited_spec.rb b/spec/couchrest/extended_doc_inherited_spec.rb
index 5422091..32a0362 100644
--- a/spec/couchrest/extended_doc_inherited_spec.rb
+++ b/spec/couchrest/extended_doc_inherited_spec.rb
@@ -2,7 +2,7 @@ require File.expand_path('../../spec_helper', __FILE__)
 
 begin
   require 'rubygems' unless ENV['SKIP_RUBYGEMS']  
-  require 'activesupport'
+  require 'active_support/json'
   ActiveSupport::JSON.backend = :JSONGem
 
   class PlainParent
@@ -36,5 +36,5 @@ begin
   end
 
 rescue LoadError
-  puts "This spec requires 'active_support' to be loaded"
+  puts "This spec requires 'active_support/json' to be loaded"
 end