diff --git a/lib/runner.js b/lib/runner.js
index eab325d..db53f82 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -27,7 +27,8 @@ async function runTest(url, options = {}) {
     const chromePath = process.platform === 'linux' ? '/usr/bin/chromium' : undefined;
     const chrome = await chromeLauncher.launch({
         chromeFlags: ['--headless', '--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'],
-        chromePath: chromePath
+        chromePath: chromePath,
+        port: 0 // Force random port to avoid concurrency issues with default 9222
     });
   
   // Lighthouse Config