diff --git a/package.json b/package.json
index 4acbbfc..e0d409f 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,8 @@
     "build:js-dev": "webpack --mode development",
     "build:js": "webpack --mode production",
     "build:py": "node ./extract-meta src/lib/components > my_dash_component/metadata.json && copyfiles package.json my_dash_component && python -c \"import dash; dash.development.component_loader.generate_classes('my_dash_component', 'my_dash_component/metadata.json')\"",
-    "build:all": "npm run build:js & npm run build:py",
-    "build:all-dev": "npm run build:js-dev & npm run build:py"
+    "build:all": "npm run build:js & npm run build:py; wait",
+    "build:all-dev": "npm run build:js-dev & npm run build:py; wait"
   },
   "author": "my-name my-email",
   "license": "my-license",