diff --git a/Gemfile.lock b/Gemfile.lock
index df49472..125ca1d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
     domain_name (0.5.19)
       unf (>= 0.0.5, < 1.0.0)
     erubis (2.7.0)
-    execjs (2.2.1)
+    execjs (2.8.1)
     factory_girl (4.4.0)
       activesupport (>= 3.0.0)
     fakeredis (0.5.0)
@@ -262,9 +262,8 @@ GEM
       polyglot (>= 0.3.1)
     tzinfo (1.2.1)
       thread_safe (~> 0.1)
-    uglifier (2.5.1)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
+    uglifier (4.2.0)
+      execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
     unf (0.1.4-java)