diff --git a/lib/active_model_serializers/model.rb b/lib/active_model_serializers/model.rb
index 9437d68b5..9b3540407 100644
--- a/lib/active_model_serializers/model.rb
+++ b/lib/active_model_serializers/model.rb
@@ -4,10 +4,7 @@
 module ActiveModelSerializers
   class Model
     include ActiveModel::Serializers::JSON
-    include ActiveModel::Validations
-    include ActiveModel::Conversion
-    extend ActiveModel::Naming
-    extend ActiveModel::Translation
+    include ActiveModel::Model
 
     class_attribute :attribute_names
     self.attribute_names = []
@@ -20,6 +17,13 @@ def self.attributes(*names)
     attributes :id
     attr_writer :updated_at
 
+    attr_reader :errors
+
+    def initialize(attributes = {})
+      @errors = ActiveModel::Errors.new(self)
+      super
+    end
+
     # Defaults to the downcased model name.
     def id
       @id ||= self.class.name.downcase
@@ -35,14 +39,6 @@ def updated_at
       defined?(@updated_at) ? @updated_at : File.mtime(__FILE__)
     end
 
-    attr_reader :errors
-
-    def initialize(attributes = {})
-      assign_attributes(attributes) if attributes
-      @errors = ActiveModel::Errors.new(self)
-      super()
-    end
-
     def attributes
       attribute_names.each_with_object({}) do |attribute_name, result|
         result[attribute_name] = public_send(attribute_name)
@@ -59,43 +55,5 @@ def self.lookup_ancestors
       [self]
     end
     # :nocov:
-
-    def assign_attributes(new_attributes)
-      unless new_attributes.respond_to?(:stringify_keys)
-        fail ArgumentError, 'When assigning attributes, you must pass a hash as an argument.'
-      end
-      return if new_attributes.blank?
-
-      attributes = new_attributes.stringify_keys
-      _assign_attributes(attributes)
-    end
-
-    private
-
-    def _assign_attributes(attributes)
-      attributes.each do |k, v|
-        _assign_attribute(k, v)
-      end
-    end
-
-    def _assign_attribute(k, v)
-      fail UnknownAttributeError.new(self, k) unless respond_to?("#{k}=")
-      public_send("#{k}=", v)
-    end
-
-    def persisted?
-      false
-    end
-
-    # Raised when unknown attributes are supplied via mass assignment.
-    class UnknownAttributeError < NoMethodError
-      attr_reader :record, :attribute
-
-      def initialize(record, attribute)
-        @record = record
-        @attribute = attribute
-        super("unknown attribute '#{attribute}' for #{@record.class}.")
-      end
-    end
   end
 end