diff --git a/src/Resources/public/sortable/Gemfile.lock b/src/Resources/public/sortable/Gemfile.lock
index 854cd33..e62afda 100644
--- a/src/Resources/public/sortable/Gemfile.lock
+++ b/src/Resources/public/sortable/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
     hpricot (0.8.6)
     http_parser.rb (0.6.0)
     i18n (0.6.11)
-    json (1.8.3)
+    json (2.3.1)
     kramdown (1.7.0)
     libv8 (3.16.14.19)
     listen (1.3.1)