diff --git a/package.json b/package.json
index 4b028ca3f65..41e40fdfcbc 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,8 @@
     "request": "2.83.0",
     "sinon": "4.4.6",
     "tar": "4.4.1",
-    "webpack": "3.10.0"
+    "webpack": "4.4.1",
+    "webpack-cli": "2.0.13"
   },
   "dependencies": {
     "ajv": "6.3.0",
diff --git a/webpack.config.js b/webpack.config.js
index 7681760b879..de7c453ef2f 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -18,6 +18,9 @@ fs.readdirSync('node_modules')
 
 
 module.exports = {
+  // Set the webpack4 mode 'none' for compatibility with the behavior
+  // of the webpack3 bundling step.
+  mode: 'none',
   entry: './src/main.js',
   target: 'node',
   output: {