diff --git a/Gemfile.lock b/Gemfile.lock
index 2961002..da6dc71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     execjs (2.5.2)
-    json (1.8.3)
+    json (2.3.1)
     rack (1.6.12)
     sass (3.4.16)
     uglifier (2.7.1)