diff --git a/Gemfile b/Gemfile
index 70838ca40..96450c8a8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -105,6 +105,8 @@ gem 'enumerize'
 
 gem 'diffy'
 
+gem 'deep_cloneable', '~> 3.0.0'
+
 # oauth2
 gem 'omniauth', '~> 1.9.0'
 gem 'omniauth-oauth2', '~> 1.6.0'