diff --git a/package.json b/package.json
index 011febb..f0d2de4 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "webpack --config webpack.dev.js --mode development",
+    "stage": "webpack --config webpack.stage.js --mode production",
     "prod": "webpack --config webpack.prod.js --mode production"
   },
   "repository": {
diff --git a/webpack.stage.js b/webpack.stage.js
index 0568b58..08bf695 100644
--- a/webpack.stage.js
+++ b/webpack.stage.js
@@ -76,11 +76,12 @@ module.exports = {
                     loader: 'babel-loader',
                     options: {
                         presets: [
-                            '@babel/preset-env',
+                            ['@babel/preset-env',
                             {
-                                "useBuiltIns": "entry"
-                            }
-                        ],
+                                "useBuiltIns": "entry",
+                                "corejs": 3.9
+                            }]
+                        ]
                     },
                 },
             },