diff --git a/ormar/models/helpers/pydantic.py b/ormar/models/helpers/pydantic.py
index 23372434c..b7d78a338 100644
--- a/ormar/models/helpers/pydantic.py
+++ b/ormar/models/helpers/pydantic.py
@@ -110,7 +110,7 @@ def get_pydantic_base_orm_config() -> pydantic.ConfigDict:
     :rtype: pydantic Config
     """
 
-    return ConfigDict(validate_assignment=True)
+    return ConfigDict(validate_assignment=True, ser_json_bytes="base64")
 
 
 def get_potential_fields(attrs: Union[Dict, MappingProxyType]) -> Dict:
diff --git a/tests/test_fastapi/test_binary_fields.py b/tests/test_fastapi/test_binary_fields.py
index cd06831c9..0564216de 100644
--- a/tests/test_fastapi/test_binary_fields.py
+++ b/tests/test_fastapi/test_binary_fields.py
@@ -61,8 +61,7 @@ class BinaryThing(ormar.Model):
 
     id: uuid.UUID = ormar.UUID(primary_key=True, default=uuid.uuid4)
     name: str = ormar.Text(default="")
-    bt: str = ormar.Enum(enum_class=BinaryEnum, represent_as_base64_str=True,
-    )
+    bt: str = ormar.LargeBinary(represent_as_base64_str=True, max_length=100)
 
 
 @app.get("/things", response_model=List[BinaryThing])
@@ -101,11 +100,6 @@ async def test_read_main():
 
 
 def test_schema():
-    schema = BinaryThing.schema()
+    schema = BinaryThing.model_json_schema()
     assert schema["properties"]["bt"]["format"] == "base64"
-    converted_choices = ["7g==", "/w==", "8CiMKA==", "wyg="]
-    assert len(schema["properties"]["bt"]["enum"]) == 4
-    assert all(
-        choice in schema["properties"]["bt"]["enum"] for choice in converted_choices
-    )
     assert schema["example"]["bt"] == "string"
diff --git a/tests/test_fastapi/test_fastapi_usage.py b/tests/test_fastapi/test_fastapi_usage.py
index 29a2ad9fe..7d7ad8466 100644
--- a/tests/test_fastapi/test_fastapi_usage.py
+++ b/tests/test_fastapi/test_fastapi_usage.py
@@ -55,7 +55,6 @@ async def test_read_main():
         assert response.json() == {
             "category": {
                 "id": None,
-                "items": [{"id": 1, "name": "test"}],
                 "name": "test cat",
             },
             "id": 1,
@@ -63,3 +62,4 @@ async def test_read_main():
         }
         item = Item(**response.json())
         assert item.id == 1
+        assert item.category.items[0].id == 1