diff --git a/flopy/mf6/utils/codegen/dfn.py b/flopy/mf6/utils/codegen/dfn.py
index fc606fa4c..bb9ecaa9b 100644
--- a/flopy/mf6/utils/codegen/dfn.py
+++ b/flopy/mf6/utils/codegen/dfn.py
@@ -1,6 +1,5 @@
 from ast import literal_eval
 from collections import UserDict
-from dataclasses import dataclass
 from enum import Enum
 from keyword import kwlist
 from os import PathLike
@@ -12,7 +11,6 @@
     Optional,
     Tuple,
     TypedDict,
-    Union,
 )
 from warnings import warn