diff --git a/util/Gemfile.lock b/util/Gemfile.lock
index c9d539c9..f95810be 100644
--- a/util/Gemfile.lock
+++ b/util/Gemfile.lock
@@ -1,19 +1,18 @@
 GEM
-  remote: http://rubygems.org/
   remote: http://rubygems.org/
   specs:
     chunky_png (1.2.8)
-    execjs (2.0.2)
+    execjs (2.8.1)
+    json (2.6.3)
     libv8 (3.16.14.3)
-    multi_json (1.8.0)
     ref (1.0.5)
     sass (3.2.11)
     therubyracer (0.12.0)
       libv8 (~> 3.16.14.0)
       ref
-    uglifier (2.2.1)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+      json (>= 1.8.0)
 
 PLATFORMS
   ruby