diff --git a/src/flask/json/tag.py b/src/flask/json/tag.py
index 97f365a9..0b84eeb4 100644
--- a/src/flask/json/tag.py
+++ b/src/flask/json/tag.py
@@ -42,7 +42,6 @@ be processed before ``dict``.
 """
 import typing as t
 from base64 import b64decode
-from base64 import b64encode
 from datetime import datetime
 from uuid import UUID