diff --git a/playwright.config.ts b/playwright.config.ts
index 6c1afe77..a617b13d 100644
--- a/playwright.config.ts
+++ b/playwright.config.ts
@@ -74,6 +74,7 @@ export default defineConfig({
     stderr: 'pipe',
     env: {
       VITE_OPEN_BROWSER: 'false',
+      PORT: '3000', // Force port 3000 for E2E tests (prevents auto-increment)
     },
   },
 
diff --git a/vite.config.ts b/vite.config.ts
index 09f3ec75..01828b7b 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -81,6 +81,7 @@ export default defineConfig(({ mode }) => {
     // Development server
     server: {
       port: env.PORT ? parseInt(env.PORT) : 3000, // Use PORT env var or default to 3000
+      strictPort: isCI, // Fail if port unavailable on CI (prevents Playwright port mismatch)
       host: true,
       open: shouldAutoOpen && !isCI,