diff --git a/package.json b/package.json
index 9f79a330e2..3c18f985ec 100644
--- a/package.json
+++ b/package.json
@@ -41,8 +41,7 @@
   "dependencies": {
     "pbf": "3.1.0",
     "pixelworks": "1.1.0",
-    "rbush": "2.0.2",
-    "uglifyjs-webpack-plugin": "^1.2.5"
+    "rbush": "2.0.2"
   },
   "devDependencies": {
     "babel-core": "^6.26.3",
@@ -84,6 +83,7 @@
     "rollup-plugin-uglify": "4.0.0",
     "serve": "^8.1.1",
     "sinon": "^5.0.1",
+    "uglifyjs-webpack-plugin": "^1.2.5",
     "url-polyfill": "^1.0.13",
     "walk": "^2.3.9",
     "webpack": "4.12.0",