diff --git a/app/controllers/api/v0/themes_controller.rb b/app/controllers/api/v0/themes_controller.rb
index 8cfa251..79b5e6b 100644
--- a/app/controllers/api/v0/themes_controller.rb
+++ b/app/controllers/api/v0/themes_controller.rb
@@ -1,6 +1,8 @@
 module Api
   module V0
     class ThemesController < Api::V0::BaseController
+      before_action :authenticate
+
       def extract
         @theme = Theme.find(extract_params[:id])
         @answers = @theme.answers