diff --git a/packages/shared-auth/src/adapters/device.ts b/packages/shared-auth/src/adapters/device.ts
index c958dc1d1..a0c062297 100644
--- a/packages/shared-auth/src/adapters/device.ts
+++ b/packages/shared-auth/src/adapters/device.ts
@@ -2,6 +2,42 @@ import type { DeviceManagerAdapter, DeviceInfo } from '../types';
 
 let deviceAdapter: DeviceManagerAdapter | null = null;
 
+/**
+ * Generate a UUID with fallback for non-secure contexts (HTTP)
+ * crypto.randomUUID() requires HTTPS, so we fall back to crypto.getRandomValues()
+ */
+function generateUUID(): string {
+	// Try native randomUUID first (requires secure context)
+	if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+		try {
+			return crypto.randomUUID();
+		} catch {
+			// Falls through to fallback
+		}
+	}
+
+	// Fallback: use crypto.getRandomValues() which works in insecure contexts
+	if (typeof crypto !== 'undefined' && typeof crypto.getRandomValues === 'function') {
+		const bytes = new Uint8Array(16);
+		crypto.getRandomValues(bytes);
+
+		// Set version (4) and variant (RFC 4122)
+		bytes[6] = (bytes[6] & 0x0f) | 0x40;
+		bytes[8] = (bytes[8] & 0x3f) | 0x80;
+
+		// Convert to hex string with dashes
+		const hex = Array.from(bytes, (b) => b.toString(16).padStart(2, '0')).join('');
+		return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
+	}
+
+	// Last resort: Math.random() based UUID (not cryptographically secure, but works)
+	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+		const r = (Math.random() * 16) | 0;
+		const v = c === 'x' ? r : (r & 0x3) | 0x8;
+		return v.toString(16);
+	});
+}
+
 /**
  * Set the device manager adapter for the auth service
  */
@@ -37,7 +73,7 @@ export function createWebDeviceAdapter(): DeviceManagerAdapter {
 		const storageKey = '@manacore/deviceId';
 		let deviceId = localStorage.getItem(storageKey);
 		if (!deviceId) {
-			deviceId = crypto.randomUUID();
+			deviceId = generateUUID();
 			localStorage.setItem(storageKey, deviceId);
 		}
 		return deviceId;