diff --git a/datamodel_code_generator/model/__init__.py b/datamodel_code_generator/model/__init__.py
index c3011c1ef..56c50558a 100644
--- a/datamodel_code_generator/model/__init__.py
+++ b/datamodel_code_generator/model/__init__.py
@@ -3,9 +3,9 @@
 import sys
 from typing import TYPE_CHECKING, Callable, Iterable, List, NamedTuple, Optional, Type
 
+from .. import DatetimeClassType, PythonVersion
 from ..types import DataTypeManager as DataTypeManagerABC
 from .base import ConstraintsBase, DataModel, DataModelFieldBase
-from .. import DatetimeClassType, PythonVersion
 
 if TYPE_CHECKING:
     from .. import DataModelType