diff --git a/controllers/custom_wizard/realtime_validations.rb b/controllers/custom_wizard/realtime_validations.rb
index 38ae1a0d..00b8c686 100644
--- a/controllers/custom_wizard/realtime_validations.rb
+++ b/controllers/custom_wizard/realtime_validations.rb
@@ -1,8 +1,11 @@
+# frozen_string_literal: true
+
 class CustomWizard::RealtimeValidationsController < ::ApplicationController
   def validate
     params.require(:validation)
     params.require(::CustomWizard::RealtimeValidation.types[params[:validation].to_sym][:required_params])
 
-    render_json_dump(::CustomWizard::RealtimeValidation.send(params[:validation], params, current_user))
+    result = ::CustomWizard::RealtimeValidation.send(params[:validation], params, current_user)
+    render_serialized(result[:items], result[:serializer], result[:opts])
   end
 end
diff --git a/lib/custom_wizard/realtime_validation.rb b/lib/custom_wizard/realtime_validation.rb
index 2dcaa50b..055965f6 100644
--- a/lib/custom_wizard/realtime_validation.rb
+++ b/lib/custom_wizard/realtime_validation.rb
@@ -32,6 +32,6 @@ class CustomWizard::RealtimeValidation
     topics.select! { |t| categories.include?(t.category.id.to_s) } if categories.present?
     topics.select! { |t| t.created_at > DateTime.parse(date_after) } if date_after.present?
     topics.map! { |t| SimilarTopic.new(t) }
-    ::ActiveModel::ArraySerializer.new(topics, each_serializer: SimilarTopicSerializer, root: :similar_topics, rest_serializer: true, scope: ::Guardian.new(current_user))
+    { items: topics, serializer: SimilarTopicSerializer, opts: { root: :similar_topics } }
   end
 end