diff --git a/couchrest_model.gemspec b/couchrest_model.gemspec
index 6a8947f..8d54a83 100644
--- a/couchrest_model.gemspec
+++ b/couchrest_model.gemspec
@@ -25,9 +25,9 @@ Gem::Specification.new do |s|
   
   s.add_dependency(%q<couchrest>, "1.1.0.pre2")
   s.add_dependency(%q<mime-types>, "~> 1.15")
-  s.add_dependency(%q<activemodel>, "~> 3.0.0")
+  s.add_dependency(%q<activemodel>, "~> 3.0")
   s.add_dependency(%q<tzinfo>, "~> 0.3.22")
-  s.add_dependency(%q<railties>, "~> 3.0.0")
+  s.add_dependency(%q<railties>, "~> 3.0")
   s.add_development_dependency(%q<rspec>, ">= 2.0.0")
   s.add_development_dependency(%q<rack-test>, ">= 0.5.7")
   # s.add_development_dependency("jruby-openssl", ">= 0.7.3")
diff --git a/lib/couchrest/model/properties.rb b/lib/couchrest/model/properties.rb
index 229c5bc..7f78444 100644
--- a/lib/couchrest/model/properties.rb
+++ b/lib/couchrest/model/properties.rb
@@ -5,26 +5,13 @@ module CouchRest
       extend ActiveSupport::Concern
 
       included do
-        extlib_inheritable_accessor(:properties) unless self.respond_to?(:properties)
-        extlib_inheritable_accessor(:properties_by_name) unless self.respond_to?(:properties_by_name)
+        class_attribute(:properties) unless self.respond_to?(:properties)
+        class_attribute(:properties_by_name) unless self.respond_to?(:properties_by_name)
         self.properties ||= []
         self.properties_by_name ||= {}
         raise "You can only mixin Properties in a class responding to [] and []=, if you tried to mixin CastedModel, make sure your class inherits from Hash or responds to the proper methods" unless (method_defined?(:[]) && method_defined?(:[]=))
       end
 
-      # Returns the Class properties
-      #
-      # ==== Returns
-      # Array:: the list of properties for model's class
-      def properties
-        self.class.properties
-      end
-
-      # Returns all the class's properties as a Hash where the key is the name
-      # of the property.
-      def properties_by_name
-        self.class.properties_by_name
-      end
 
       # Returns the Class properties with their values
       #
diff --git a/lib/couchrest_model.rb b/lib/couchrest_model.rb
index 7de6b41..8892ea4 100644
--- a/lib/couchrest_model.rb
+++ b/lib/couchrest_model.rb
@@ -1,7 +1,6 @@
 require 'active_model'
 require "active_model/callbacks"
 require "active_model/conversion"
-require "active_model/deprecated_error_methods"
 require "active_model/errors"
 require "active_model/naming"
 require "active_model/serialization"