diff --git a/Gruntfile.js b/Gruntfile.js
index dbeef3c1..52c8147e 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -232,7 +232,7 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-contrib-clean');
   grunt.loadNpmTasks('grunt-shell-spawn');
   grunt.loadNpmTasks('grunt-jasmine-node');
-  grunt.loadNpmTasks('grunt-contrib-uglify');
+  grunt.loadNpmTasks('grunt-contrib-uglify-es');
   grunt.loadNpmTasks('grunt-react');
   grunt.loadNpmTasks('grunt-env');
 
diff --git a/package.json b/package.json
index 7ded23c8..281d5a55 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "grunt-browserify": "^5.3.0",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-jshint": "^2.1.0",
-    "grunt-contrib-uglify": "^4.0.1",
+    "grunt-contrib-uglify-es": "^3.3.0",
     "grunt-env": "^0.4.4",
     "grunt-hash": "^0.5.0",
     "grunt-jasmine-node": "~0.1.0",