diff --git a/Gemfile b/Gemfile
index a452debd..b5b83c2c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
+gem "json"
 gem "rails", "~> 5.1"
 
 gem "unicorn"