diff --git a/Gemfile.lock b/Gemfile.lock
index 8b9fa42..9d6027c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.1.0)
+    json (2.3.1)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)