diff --git a/backend/src/schemas.py b/backend/src/schemas.py
index 56b4441..e141a75 100644
--- a/backend/src/schemas.py
+++ b/backend/src/schemas.py
@@ -51,6 +51,8 @@ class ItemBase(BaseModel):
     по результатам экспедиционных исследований
     """
 
+    model_config = ConfigDict(coerce_numbers_to_str=True)
+
     fadr: Optional[str] = None
     internal_id: Optional[str] = None
     x_coord: Optional[str] = None