diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 3f21e1f3d..950277a95 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -18,7 +18,7 @@
 # reified when subclassed to decorate a resource.
 module ActiveModel
   class Serializer
-    SERIALIZABLE_HASH_VALID_KEYS = [:only, :except, :methods, :include].freeze
+    SERIALIZABLE_HASH_VALID_KEYS = [:only, :except, :methods, :include, :root].freeze
     extend ActiveSupport::Autoload
     autoload :Adapter
     autoload :Null
diff --git a/lib/active_model_serializers/adapter/attributes.rb b/lib/active_model_serializers/adapter/attributes.rb
index 38446d846..95189233a 100644
--- a/lib/active_model_serializers/adapter/attributes.rb
+++ b/lib/active_model_serializers/adapter/attributes.rb
@@ -8,7 +8,7 @@ def initialize(serializer, options = {})
       end
 
       def serializable_hash(options = nil)
-        options = super
+        options = serialization_options(options)
 
         if serializer.respond_to?(:each)
           serializable_hash_for_collection(options)
diff --git a/lib/active_model_serializers/adapter/base.rb b/lib/active_model_serializers/adapter/base.rb
index 04d30ca8e..a73aa6d7b 100644
--- a/lib/active_model_serializers/adapter/base.rb
+++ b/lib/active_model_serializers/adapter/base.rb
@@ -19,8 +19,10 @@ def cached_name
         @cached_name ||= self.class.name.demodulize.underscore
       end
 
-      def serializable_hash(options = nil)
-        (options ||= {}).slice(*ActiveModel::Serializer::SERIALIZABLE_HASH_VALID_KEYS) # rubocop:disable Lint/UselessAssignment
+      # Subclasses that implement this method must first call
+      #   options = serialization_options(options)
+      def serializable_hash(_options = nil)
+        fail NotImplementedError, 'This is an abstract method. Should be implemented at the concrete adapter.'
       end
 
       def as_json(options = nil)
@@ -41,6 +43,10 @@ def cache_check(serializer)
 
       private
 
+      def serialization_options(options)
+        (options ||= {}).slice(*ActiveModel::Serializer::SERIALIZABLE_HASH_VALID_KEYS) # rubocop:disable Lint/UselessAssignment
+      end
+
       def meta
         instance_options.fetch(:meta, nil)
       end
diff --git a/lib/active_model_serializers/adapter/json.rb b/lib/active_model_serializers/adapter/json.rb
index 486e1c57b..69960212e 100644
--- a/lib/active_model_serializers/adapter/json.rb
+++ b/lib/active_model_serializers/adapter/json.rb
@@ -2,7 +2,7 @@ module ActiveModelSerializers
   module Adapter
     class Json < Base
       def serializable_hash(options = nil)
-        options = super
+        options = serialization_options(options)
         serialized_hash = { root => Attributes.new(serializer, instance_options).serializable_hash(options) }
         transform_key_casing!(serialized_hash)
       end
diff --git a/test/adapter_test.rb b/test/adapter_test.rb
index 01dddc2f2..b3821c467 100644
--- a/test/adapter_test.rb
+++ b/test/adapter_test.rb
@@ -8,10 +8,21 @@ def setup
       @adapter = ActiveModelSerializers::Adapter::Base.new(@serializer)
     end
 
-    def test_serializable_ensures_options_is_a_hash
-      assert_equal({ only: [:name] }, @adapter.serializable_hash(only: [:name]))
-      assert_equal({}, @adapter.serializable_hash(nil))
-      assert_equal({}, @adapter.serializable_hash({}))
+    def test_serializable_hash_is_abstract_method
+      assert_raises(NotImplementedError) do
+        @adapter.serializable_hash(only: [:name])
+      end
+    end
+
+    def test_serialization_options_ensures_option_is_a_hash
+      adapter = Class.new(ActiveModelSerializers::Adapter::Base) do
+        def serializable_hash(options = nil)
+          serialization_options(options)
+        end
+      end.new(@serializer)
+      assert_equal({ only: [:name] }, adapter.serializable_hash(only: [:name]))
+      assert_equal({}, adapter.serializable_hash(nil))
+      assert_equal({}, adapter.serializable_hash({}))
     end
 
     def test_serializer