diff --git a/tests/e2e/wdio.electrobun.conf.js b/tests/e2e/wdio.electrobun.conf.js
index 73e5b29..bccc054 100644
--- a/tests/e2e/wdio.electrobun.conf.js
+++ b/tests/e2e/wdio.electrobun.conf.js
@@ -77,6 +77,9 @@ export const config = {
     }
 
     if (!electrobunBinary) {
+      // Kill any stale process on CDP port before launching
+      try { execSync(`fuser -k ${CDP_PORT}/tcp 2>/dev/null || true`); } catch {}
+
       // Fall back to `electrobun dev` which builds + launches in one step
       console.log('[electrobun-cdp] No binary found, launching via electrobun dev...');
       appProcess = spawn('npx', ['electrobun', 'dev'], {