diff --git a/packages/auth-ui/src/__tests__/auth-ui.test.tsx b/packages/auth-ui/src/__tests__/auth-ui.test.tsx
index 32e0f12d..81eb973c 100644
--- a/packages/auth-ui/src/__tests__/auth-ui.test.tsx
+++ b/packages/auth-ui/src/__tests__/auth-ui.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, expect, it, vi, beforeEach } from 'vitest';
 import { render, screen, fireEvent, cleanup } from '@testing-library/react';
 import { LoginForm } from '../LoginForm.js';
diff --git a/packages/auth-ui/src/__tests__/new-components.test.tsx b/packages/auth-ui/src/__tests__/new-components.test.tsx
index 76526695..6134b616 100644
--- a/packages/auth-ui/src/__tests__/new-components.test.tsx
+++ b/packages/auth-ui/src/__tests__/new-components.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, expect, it, vi, beforeEach } from 'vitest';
 import { render, screen, fireEvent, cleanup } from '@testing-library/react';
 import { RegisterForm } from '../RegisterForm.js';
diff --git a/packages/dashboard-components/src/components.test.tsx b/packages/dashboard-components/src/components.test.tsx
index e3735a38..9f838e79 100644
--- a/packages/dashboard-components/src/components.test.tsx
+++ b/packages/dashboard-components/src/components.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen, fireEvent } from '@testing-library/react';
 import { LoadingSpinner } from './LoadingSpinner.js';
diff --git a/packages/dashboard-shell/src/__tests__/dashboard-shell.test.tsx b/packages/dashboard-shell/src/__tests__/dashboard-shell.test.tsx
index c07598a6..ebce925b 100644
--- a/packages/dashboard-shell/src/__tests__/dashboard-shell.test.tsx
+++ b/packages/dashboard-shell/src/__tests__/dashboard-shell.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { render, screen, fireEvent, cleanup } from '@testing-library/react';
 import { DashboardShell } from '../DashboardShell.js';
diff --git a/packages/react-auth/src/__tests__/react-auth.test.tsx b/packages/react-auth/src/__tests__/react-auth.test.tsx
index 0c080713..303f884b 100644
--- a/packages/react-auth/src/__tests__/react-auth.test.tsx
+++ b/packages/react-auth/src/__tests__/react-auth.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, expect, it, vi, beforeEach } from 'vitest';
 import { render, screen, act, cleanup } from '@testing-library/react';
 import { createAuthProvider } from '../index.js';
diff --git a/packages/react-auth/src/__tests__/smartauth.test.tsx b/packages/react-auth/src/__tests__/smartauth.test.tsx
index 104e2e70..26c687ec 100644
--- a/packages/react-auth/src/__tests__/smartauth.test.tsx
+++ b/packages/react-auth/src/__tests__/smartauth.test.tsx
@@ -1,3 +1,4 @@
+// @vitest-environment happy-dom
 import { describe, expect, it, vi, beforeEach } from 'vitest';
 import { render, screen, act, cleanup } from '@testing-library/react';
 import { createAuthProvider } from '../index.js';