diff --git a/Gemfile.lock b/Gemfile.lock
index 182a315..454bbb4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     dotenv-rails (0.9.0)
       dotenv (= 0.9.0)
     erubis (2.7.0)
-    execjs (2.0.1)
+    execjs (2.8.1)
     ffi2-generators (0.1.1)
     hike (1.2.3)
     i18n (0.6.9)
@@ -96,7 +96,7 @@ GEM
     mocha (0.14.0)
       metaclass (~> 0.0.1)
     mono_logger (1.1.0)
-    multi_json (1.8.4)
+    multi_json (1.15.0)
     polyglot (0.3.4)
     racc (1.4.10)
     rack (1.5.2)
@@ -376,9 +376,8 @@ GEM
       rails (>= 3.1)
       railties (>= 3.1)
     tzinfo (0.3.38)
-    uglifier (2.2.0)
-      execjs (>= 0.3.0)
-      multi_json (~> 1.0, >= 1.0.2)
+    uglifier (4.2.0)
+      execjs (>= 0.3.0, < 3)
     vegas (0.1.11)
       rack (>= 1.0.0)