diff --git a/Gemfile.lock b/Gemfile.lock
index 25bed6d..2d42855 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     jquery-rails (3.0.4)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.0)
+    json (2.3.1)
     kgio (2.8.0)
     listen (1.2.3)
       rb-fsevent (>= 0.9.3)