diff --git a/package.json b/package.json
index da1d8bb..d7e8ecc 100644
--- a/package.json
+++ b/package.json
@@ -12,9 +12,11 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@babel/core": "^7.3.3",
+    "@babel/core": "^7.2.2",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/preset-env": "^7.3.1",
+    "acorn": "^6.0.5",
+    "acorn-dynamic-import": "^4.0.0",
     "autoprefixer": "^9.4.8",
     "babel-loader": "^8.0.5",
     "css-loader": "^2.1.0",