diff --git a/webpack.config.server.js b/webpack.config.server.js
index 5a0a38ab..fe6d9160 100644
--- a/webpack.config.server.js
+++ b/webpack.config.server.js
@@ -1,6 +1,6 @@
-var fs = require('fs');
-var path = require('path');
-var ExternalsPlugin = require('webpack-externals-plugin');
+let fs = require('fs');
+let path = require('path');
+let ExternalsPlugin = require('webpack-externals-plugin');
 
 module.exports = {