diff --git a/repositories/board.py b/repositories/board.py
index 63a392b..065e3e8 100644
--- a/repositories/board.py
+++ b/repositories/board.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from sqlalchemy import select
 
 from models import Board
@@ -13,7 +15,7 @@ class BoardRepository(BaseRepository):
         result = await self.session.execute(stmt)
         return list(result.scalars().all())
 
-    async def get_by_id(self, board_id: int) -> Board | None:
+    async def get_by_id(self, board_id: int) -> Optional[Board]:
         stmt = select(Board).where(Board.id == board_id, Board.is_deleted.is_(False))
         result = await self.session.execute(stmt)
         return result.scalar_one_or_none()
diff --git a/repositories/deal.py b/repositories/deal.py
index f0904df..f3c46c0 100644
--- a/repositories/deal.py
+++ b/repositories/deal.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from sqlalchemy import select
 
 from models import Deal
@@ -11,7 +13,7 @@ class DealRepository(BaseRepository):
         result = await self.session.execute(stmt)
         return list(result.scalars().all())
 
-    async def get_by_id(self, deal_id: int) -> Deal | None:
+    async def get_by_id(self, deal_id: int) -> Optional[Deal]:
         stmt = select(Deal).where(Deal.id == deal_id, Deal.is_deleted.is_(False))
         result = await self.session.execute(stmt)
         return result.scalar_one_or_none()
diff --git a/repositories/status.py b/repositories/status.py
index 7b15c15..25f4ec2 100644
--- a/repositories/status.py
+++ b/repositories/status.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from sqlalchemy import select
 
 from models import Status
@@ -7,14 +9,13 @@ from schemas.status import UpdateStatusSchema
 
 class StatusRepository(BaseRepository):
     async def get_all(self, board_id: int) -> list[Status]:
-        stmt = (
-            select(Status)
-            .where(Status.is_deleted.is_(False), Status.board_id == board_id)
+        stmt = select(Status).where(
+            Status.is_deleted.is_(False), Status.board_id == board_id
         )
         result = await self.session.execute(stmt)
         return list(result.scalars().all())
 
-    async def get_by_id(self, status_id: int) -> Status | None:
+    async def get_by_id(self, status_id: int) -> Optional[Status]:
         stmt = select(Status).where(
             Status.id == status_id, Status.is_deleted.is_(False)
         )
diff --git a/schemas/base.py b/schemas/base.py
index cb40192..ddc723b 100644
--- a/schemas/base.py
+++ b/schemas/base.py
@@ -1,4 +1,4 @@
-from typing import Self
+from typing import Self, Optional
 
 from pydantic import BaseModel
 from pydantic.alias_generators import to_camel
@@ -36,8 +36,8 @@ class BaseResponse(BaseSchema):
 
 
 class PaginationSchema(BaseSchema):
-    page: int | None = None
-    items_per_page: int | None = None
+    page: Optional[int] = None
+    items_per_page: Optional[int] = None
 
 
 class PaginationInfoSchema(BaseSchema):
diff --git a/schemas/board.py b/schemas/board.py
index 4094b1d..8f13e29 100644
--- a/schemas/board.py
+++ b/schemas/board.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from schemas.base import BaseSchema, BaseResponse
 
 
@@ -14,8 +16,8 @@ class BoardSchema(BaseBoardSchema):
 
 
 class UpdateBoardSchema(BaseSchema):
-    name: str | None = None
-    lexorank: str | None = None
+    name: Optional[str] = None
+    lexorank: Optional[str] = None
 
 
 # endregion
diff --git a/schemas/deal.py b/schemas/deal.py
index f715d71..522c04c 100644
--- a/schemas/deal.py
+++ b/schemas/deal.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from schemas.base import BaseSchema, BaseResponse
 
 
@@ -15,9 +17,9 @@ class DealSchema(BaseDealSchema):
 
 
 class UpdateDealSchema(BaseSchema):
-    name: str | None = None
-    lexorank: str | None = None
-    status_id: int | None = None
+    name: Optional[str] = None
+    lexorank: Optional[str] = None
+    status_id: Optional[int] = None
 
 
 # endregion
diff --git a/schemas/status.py b/schemas/status.py
index d0f40e7..ee80a01 100644
--- a/schemas/status.py
+++ b/schemas/status.py
@@ -1,3 +1,5 @@
+from typing import Optional
+
 from schemas.base import BaseSchema, BaseResponse
 
 
@@ -14,8 +16,8 @@ class StatusSchema(BaseStatusSchema):
 
 
 class UpdateStatusSchema(BaseSchema):
-    name: str | None = None
-    lexorank: str | None = None
+    name: Optional[str] = None
+    lexorank: Optional[str] = None
 
 
 # endregion
diff --git a/utils/pagination.py b/utils/pagination.py
index 46605b1..d31d333 100644
--- a/utils/pagination.py
+++ b/utils/pagination.py
@@ -1,13 +1,15 @@
+from typing import Optional
+
 from schemas.base import PaginationSchema
 
 
 async def pagination_parameters(
-    page: int | None = None, items_per_page: int | None = None
+    page: Optional[int] = None, items_per_page: Optional[int] = None
 ) -> PaginationSchema:
     return PaginationSchema(page=page, items_per_page=items_per_page)
 
 
-def is_valid_pagination(pagination: PaginationSchema | None) -> bool:
+def is_valid_pagination(pagination: Optional[PaginationSchema]) -> bool:
     if not pagination:
         return False
     return all(