diff --git a/Gemfile.lock b/Gemfile.lock
index 10c6a0bf..714cfafe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -722,12 +722,11 @@ DEPENDENCIES
   json-schema
   leaflet-rails
   letter_opener
-  letter_opener_web (~> 1.0)
-  mimemagic
+  letter_opener_web
   mina
   mini_magick
   money-rails
-  nokogiri (>= 1.8.1)
+  nokogiri
   omniauth
   omniauth-discourse
   omniauth-facebook
diff --git a/config/routes.rb b/config/routes.rb
index a901509e..57863a06 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,5 @@
 Osem::Application.routes.draw do
+  mount LetterOpenerWeb::Engine, at: '/letter_opener' if Rails.env.development?
 
   mount LetterOpenerWeb::Engine, at: '/letter_opener' if Rails.env.development?