diff --git a/Gemfile.lock b/Gemfile.lock
index 283f2c0..f3d7ab6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -103,8 +103,7 @@ GEM
     erubi (1.10.0)
     erubis (2.7.0)
     eventmachine (1.2.7)
-    execjs (1.4.0)
-      multi_json (~> 1.0)
+    execjs (2.8.1)
     faye-websocket (0.11.0)
       eventmachine (>= 0.12.0)
       websocket-driver (>= 0.5.1)
@@ -301,9 +300,9 @@ GEM
       polyglot
       polyglot (>= 0.3.1)
     tzinfo (0.3.55)
-    uglifier (1.3.0)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+      json (>= 1.8.0)
     vcr (2.4.0)
     websocket (1.0.7)
     websocket-driver (0.7.3)