diff --git a/package.json b/package.json
index 06e5997..4d64b01 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,9 @@
     "src/client/web"
   ],
   "scripts": {
-    "build:fe": "bash scripts/copy_js.sh && webpack --config src/client/web/webpack.app.prod.js",
-    "build:fe:dev": "bash scripts/copy_js_dev.sh && webpack --config src/client/web/webpack.app.dev.js --watch",
-    "build:fe:watch": "bash scripts/copy_js.sh && webpack --config src/client/web/webpack.app.prod.js --watch",
+    "build:fe": "yarn && bash scripts/copy_js.sh && webpack --config src/client/web/webpack.app.prod.js",
+    "build:fe:dev": "yarn && bash scripts/copy_js_dev.sh && webpack --config src/client/web/webpack.app.dev.js --watch",
+    "build:fe:watch": "yarn && bash scripts/copy_js.sh && webpack --config src/client/web/webpack.app.prod.js --watch",
     "start": "yarn build:fe && go run cmd/start/main.go -c `pwd`/configs/dev.yml",
 
     "build": "yarn build:fe && bash scripts/build_be.sh",
diff --git a/scripts/copy_js.sh b/scripts/copy_js.sh
index 009555e..537f88d 100644
--- a/scripts/copy_js.sh
+++ b/scripts/copy_js.sh
@@ -2,7 +2,6 @@
 set -o nounset errexit
 
 export ROOT=`pwd`
-yarn
 cp $ROOT/node_modules/immutable/dist/immutable.min.js $ROOT/public/static/js/
 cp $ROOT/node_modules/react-dom/umd/react-dom.production.min.js $ROOT/public/static/js/
 cp $ROOT/node_modules/react/umd/react.production.min.js $ROOT/public/static/js
diff --git a/scripts/copy_js_dev.sh b/scripts/copy_js_dev.sh
index d443ac0..144d6ca 100644
--- a/scripts/copy_js_dev.sh
+++ b/scripts/copy_js_dev.sh
@@ -2,7 +2,6 @@
 set -o nounset errexit
 
 export ROOT=`pwd`
-yarn
 cp $ROOT/node_modules/immutable/dist/immutable.min.js $ROOT/public/static/js/
 cp $ROOT/node_modules/react-dom/umd/react-dom.development.js $ROOT/public/static/js/
 cp $ROOT/node_modules/react/umd/react.development.js $ROOT/public/static/js/