diff --git a/Gemfile b/Gemfile
index bd91d857c..2aa798e25 100644
--- a/Gemfile
+++ b/Gemfile
@@ -139,6 +139,7 @@ gem 'rest-client'
 gem 'rinku'
 gem 'sanitize'
 gem 'sass'
+gem 'es6_module_transpiler-rails'
 gem 'sidekiq'
 
 gem 'sinatra', require: nil