diff --git a/todo/models/common/pyobjectid.py b/todo/models/common/pyobjectid.py
index 935e0ab..67fcadb 100644
--- a/todo/models/common/pyobjectid.py
+++ b/todo/models/common/pyobjectid.py
@@ -13,7 +13,3 @@ def validate(cls, value, field=None):
         if value is not None and ObjectId.is_valid(value):
             return ObjectId(value)
         raise ValueError(f"Invalid ObjectId: {value}")
-
-    @classmethod
-    def __get_pydantic_json_schema__(cls, field_schema):
-        field_schema.update(type="string")
diff --git a/todo/tests/unit/models/common/test_pyobjectid.py b/todo/tests/unit/models/common/test_pyobjectid.py
index 91381a4..e180708 100644
--- a/todo/tests/unit/models/common/test_pyobjectid.py
+++ b/todo/tests/unit/models/common/test_pyobjectid.py
@@ -20,11 +20,6 @@ def test_validate_invalid_objectid(self):
     def test_validate_none(self):
         self.assertIsNone(PyObjectId.validate(None))
 
-    def test_pydantic_json_schema(self):
-        field_schema = {}
-        PyObjectId.__get_pydantic_json_schema__(field_schema)
-        self.assertEqual(field_schema["type"], "string")
-
     def test_integration_with_pydantic_model(self):
         class TestModel(BaseModel):
             id: PyObjectId