diff --git a/gulpfile.babel.js b/gulpfile.babel.js
index 298b5ff..298cb50 100644
--- a/gulpfile.babel.js
+++ b/gulpfile.babel.js
@@ -14,7 +14,7 @@ import yaml         from 'js-yaml'
 import request      from 'request'
 
 // required to get our mix of old and ES6+ js to work with ugify-js 3
-import uglifyjs     from 'uglify-js'
+import uglifyjs     from 'uglify-es'
 import composer     from 'gulp-uglify/composer'
 const minify = composer(uglifyjs, console)
 const cp = require('child_process')
diff --git a/package.json b/package.json
index c767fbf..c1863fd 100644
--- a/package.json
+++ b/package.json
@@ -75,7 +75,7 @@
     "stylelint": "^9.1.3",
     "stylelint-config-bigchaindb": "^1.2.1",
     "stylelint-config-standard": "^18.2.0",
-    "uglify-js": "^3.3.16"
+    "uglify-es": "^3.3.9"
   },
   "engines": {
     "node": ">=7.0.0"