diff --git a/webpack.config.renderer.js b/webpack.config.renderer.js
index 7bfa28bc..193f2843 100644
--- a/webpack.config.renderer.js
+++ b/webpack.config.renderer.js
@@ -13,7 +13,7 @@ const merge = require('webpack-merge');
 
 const base = require('./webpack.config.base');
 
-const WEBSERVER_PORT = 9001;
+const WEBSERVER_PORT = process.env.WEBSERVER_PORT ?? 9001;
 
 module.exports = merge(base, {
     entry: {
diff --git a/webpack.config.test.js b/webpack.config.test.js
index 208bf116..e00cf471 100644
--- a/webpack.config.test.js
+++ b/webpack.config.test.js
@@ -12,7 +12,7 @@ const merge = require('webpack-merge');
 
 const base = require('./webpack.config.base');
 
-const WEBSERVER_PORT = 9001;
+const WEBSERVER_PORT = process.env.WEBSERVER_PORT ?? 9001;
 
 module.exports = merge(base, {
     entry: {