diff --git a/api/src/core/exception_handlers.py b/api/src/core/exception_handlers.py
index f7643c2..42a585b 100644
--- a/api/src/core/exception_handlers.py
+++ b/api/src/core/exception_handlers.py
@@ -1,4 +1,5 @@
 from fastapi import FastAPI, HTTPException, Request, status
+from fastapi.encoders import jsonable_encoder
 from fastapi.exceptions import RequestValidationError
 from fastapi.responses import JSONResponse
 from sqlalchemy.exc import IntegrityError, SQLAlchemyError
@@ -8,8 +9,9 @@ def register_exception_handlers(app: FastAPI) -> None:
     @app.exception_handler(RequestValidationError)
     async def request_validation_exception_handler(_: Request, exc: RequestValidationError):
         return JSONResponse(
-            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
-            content={"detail": exc.errors()},
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+            # ctx ошибки может содержать исключение (ValueError из валидатора) — сериализуем через jsonable_encoder
+            content={"detail": jsonable_encoder(exc.errors())},
         )
 
     @app.exception_handler(IntegrityError)