diff --git a/src/index.tsx b/src/index.tsx
index 9baf688c9..f9db69106 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,13 +1,16 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
 import App from './router';
-import IO from 'socket.io-client';
 
 const MOUNT_NODE = document.getElementById('root');
 
-const socket = IO('http://localhost:9099');
-socket.on('refresh', () => {
-  location.reload();
-});
+if (process.env.BUILD_ENV !== 'prod') {
+  import('socket.io-client').then(target => {
+    const socket = target.default('http://localhost:9099');
+    socket.on('refresh', () => {
+      location.reload();
+    });
+  });
+}
 
 ReactDOM.render(<App />, MOUNT_NODE);