diff --git a/crud.py b/crud.py
index 90c7c9d..8e48475 100644
--- a/crud.py
+++ b/crud.py
@@ -1,4 +1,5 @@
 from datetime import datetime, timedelta, timezone
+from typing import Optional
 
 from lnbits.db import Database
 from lnbits.helpers import urlsafe_short_hash
diff --git a/models.py b/models.py
index 06f4d8e..d3bf696 100644
--- a/models.py
+++ b/models.py
@@ -1,4 +1,5 @@
 from datetime import datetime
+from typing import Optional
 
 from fastapi import Query
 from pydantic import BaseModel, EmailStr, root_validator