diff --git a/v1/webdriver/webdriverio/wdio.conf.js b/v1/webdriver/webdriverio/wdio.conf.js
index adba6aa..a3fc2c1 100644
--- a/v1/webdriver/webdriverio/wdio.conf.js
+++ b/v1/webdriver/webdriverio/wdio.conf.js
@@ -14,7 +14,7 @@ exports.config = {
       "tauri:options": {
         application: "../../src-tauri/target/debug/tauri-app",
       },
-      port: process.env.TAURI_DRIVER_PORT || 4444,
+      port: Number(process.env.TAURI_DRIVER_PORT || 4444),
     },
   ],
   reporters: ["spec"],
diff --git a/v2/webdriver/webdriverio/wdio.conf.js b/v2/webdriver/webdriverio/wdio.conf.js
index 00a2fcd..112eaa1 100644
--- a/v2/webdriver/webdriverio/wdio.conf.js
+++ b/v2/webdriver/webdriverio/wdio.conf.js
@@ -14,7 +14,7 @@ exports.config = {
       "tauri:options": {
         application: "../../src-tauri/target/debug/tauri-app",
       },
-      port: process.env.TAURI_DRIVER_PORT || 4444,
+      port: Number(process.env.TAURI_DRIVER_PORT || 4444),
     },
   ],
   reporters: ["spec"],