diff --git a/Gemfile.lock b/Gemfile.lock
index f881f3f..a5e1108 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,8 +51,7 @@ GEM
       eventmachine (>= 1.0.0.beta.1)
     erubis (2.7.0)
     eventmachine (1.0.0.beta.3)
-    execjs (1.2.4)
-      multi_json (~> 1.0)
+    execjs (2.8.1)
     hike (1.2.3)
     http_parser.rb (0.5.2)
     i18n (0.9.5)
@@ -66,7 +65,7 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.16)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     mysql2 (0.3.7)
     polyglot (0.3.2)
     rack (1.3.10)
@@ -119,9 +118,9 @@ GEM
       polyglot
       polyglot (>= 0.3.1)
     tzinfo (0.3.29)
-    uglifier (1.0.3)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
-      multi_json (>= 1.0.2)
+      json (>= 1.8.0)
 
 PLATFORMS
   ruby