diff --git a/package.json b/package.json
index e3cf97b..dd99dee 100644
--- a/package.json
+++ b/package.json
@@ -43,10 +43,10 @@
   },
   "scripts": {
     "start": "node --experimental-fetch ./",
-    "dev": "LOG_LEVEL=debug yarn run watch & yarn run build:static:dev",
+    "dev": "LOG_LEVEL=debug yarn run watch && yarn run build:static:dev",
     "test": "yarn run lint && mocha",
     "watch": "./node_modules/.bin/nodemon --config nodemon.json ./",
-    "build": "yarn run build:server & yarn run build:static",
+    "build": "yarn run build:server && yarn run build:static",
     "build:server": "ncc build ./src/index.js -o dist",
     "build:static": "webpack --config webpack.config.js --env static=true --env mode=production",
     "build:static:dev": "webpack --config webpack.config.js --env static=true --env mode=development",