diff --git a/eav/models/enum_group.py b/eav/models/enum_group.py
index c5ff664..9b57705 100644
--- a/eav/models/enum_group.py
+++ b/eav/models/enum_group.py
@@ -1,4 +1,4 @@
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Tuple
 
 from django.db import models
 from django.db.models import ManyToManyField
@@ -47,7 +47,7 @@ class EnumGroup(models.Model):
         """String representation of `EnumGroup` object."""
         return f'<EnumGroup {self.name}>'
 
-    def natural_key(self) -> tuple[str]:
+    def natural_key(self) -> Tuple[str]:
         """
         Retrieve the natural key for the EnumGroup instance.
 
diff --git a/eav/models/enum_value.py b/eav/models/enum_value.py
index b47252c..29b4ccc 100644
--- a/eav/models/enum_value.py
+++ b/eav/models/enum_value.py
@@ -1,3 +1,5 @@
+from typing import Tuple
+
 from django.db import models
 from django.utils.translation import gettext_lazy as _
 
@@ -58,7 +60,7 @@ class EnumValue(models.Model):
         """String representation of `EnumValue` object."""
         return f'<EnumValue {self.value}>'
 
-    def natural_key(self) -> tuple[str]:
+    def natural_key(self) -> Tuple[str]:
         """
         Retrieve the natural key for the EnumValue instance.