diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index 93db39e..0139f58 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -33,7 +33,6 @@ from typing import (
     Union,
     Optional,
     List,
-    Set,
     Tuple,
 )
 import uuid