diff --git a/hub/catalog_factories/data_models/cost/fuel.py b/hub/catalog_factories/data_models/cost/fuel.py
index 974b3db2..82b47477 100644
--- a/hub/catalog_factories/data_models/cost/fuel.py
+++ b/hub/catalog_factories/data_models/cost/fuel.py
@@ -46,7 +46,7 @@ class Fuel:
     return self._fixed_power
 
   @property
-  def variable(self) -> Union[(None, None), (float, str)]:
+  def variable(self) -> Union[tuple[None, None], tuple[float, str]]:
     """
     Get variable costs in given units
     :return: None, None or float, str
diff --git a/hub/catalog_factories/data_models/cost/item_description.py b/hub/catalog_factories/data_models/cost/item_description.py
index 42ce94b4..45b24bbb 100644
--- a/hub/catalog_factories/data_models/cost/item_description.py
+++ b/hub/catalog_factories/data_models/cost/item_description.py
@@ -36,7 +36,7 @@ class ItemDescription:
     return self._item_type
 
   @property
-  def initial_investment(self) -> Union[(None, None), (float, str)]:
+  def initial_investment(self) -> Union[tuple[None, None], tuple[float, str]]:
     """
     Get initial investment of the specific item in given units
     :return: None, None or float, str
@@ -44,7 +44,7 @@ class ItemDescription:
     return self._initial_investment, self._initial_investment_unit
 
   @property
-  def refurbishment(self) -> Union[(None, None), (float, str)]:
+  def refurbishment(self) -> Union[tuple[None, None], tuple[float, str]]:
     """
     Get refurbishment costs of the specific item in given units
     :return: None, None or float, str
@@ -52,7 +52,7 @@ class ItemDescription:
     return self._refurbishment, self._refurbishment_unit
 
   @property
-  def reposition(self) -> Union[(None, None), (float, str)]:
+  def reposition(self) -> Union[tuple[None, None], tuple[float, str]]:
     """
     Get reposition costs of the specific item in given units
     :return: None, None or float, str