diff --git a/src/lib/generateUserId.ts b/src/lib/generateUserId.ts
index fd8ecee..2d97717 100644
--- a/src/lib/generateUserId.ts
+++ b/src/lib/generateUserId.ts
@@ -1,5 +1,8 @@
+import { randomBytes } from 'crypto';
+
 export const generateUserId = () => {
-	const userId = 'user_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
+	const secureRandomString = randomBytes(8).toString('base36').substr(0, 9);
+	const userId = 'user_' + Date.now() + '_' + secureRandomString;
 
 	return userId;
 };