diff --git a/ninja/openapi/schema.py b/ninja/openapi/schema.py
index 72226e770..7325b1222 100644
--- a/ninja/openapi/schema.py
+++ b/ninja/openapi/schema.py
@@ -4,6 +4,8 @@
 from http.client import responses
 from typing import TYPE_CHECKING, Any, Dict, Generator, List, Optional, Set, Tuple
 
+from pydantic.json_schema import JsonSchemaMode
+
 from ninja.constants import NOT_SET
 from ninja.operation import Operation
 from ninja.params.models import TModel, TModels
@@ -207,14 +209,19 @@ def _create_schema_from_model(
         model: TModel,
         by_alias: bool = True,
         remove_level: bool = True,
+        is_response: bool = False,
     ) -> Tuple[DictStrAny, bool]:
         if hasattr(model, "__ninja_flatten_map__"):
             schema = self._flatten_schema(model)
         else:
+            mode: JsonSchemaMode = "validation"
+            if is_response:
+                mode = "serialization"
             schema = model.model_json_schema(
                 ref_template=REF_TEMPLATE,
                 by_alias=by_alias,
                 schema_generator=NinjaGenerateJsonSchema,
+                mode=mode,
             ).copy()
 
         # move Schemas from definitions
@@ -284,7 +291,7 @@ def responses(self, operation: Operation) -> Dict[int, DictStrAny]:
             if model not in [None, NOT_SET]:
                 # ::TODO:: test this: by_alias == True
                 schema = self._create_schema_from_model(
-                    model, by_alias=operation.by_alias
+                    model, by_alias=operation.by_alias, is_response=True
                 )[0]
                 details[status]["content"] = {
                     self.api.renderer.media_type: {"schema": schema}
diff --git a/ninja/schema.py b/ninja/schema.py
index f0e785822..3db8c5a9a 100644
--- a/ninja/schema.py
+++ b/ninja/schema.py
@@ -199,6 +199,7 @@ def default_schema(self, schema: Any) -> JsonSchemaValue:
 class Schema(BaseModel, metaclass=ResolverMetaclass):
     class Config:
         from_attributes = True  # aka orm_mode
+        json_schema_serialization_defaults_required = True
 
     @model_validator(mode="wrap")
     @classmethod
diff --git a/tests/test_alias.py b/tests/test_alias.py
index 3430ed6b4..21e531ef6 100644
--- a/tests/test_alias.py
+++ b/tests/test_alias.py
@@ -23,6 +23,9 @@ def test_alias():
                 "properties": {
                     "foo": {"type": "string", "default": "", "title": "Foo"}
                 },
+                "required": [
+                    "foo",
+                ],
                 "title": "SchemaWithAlias",
             }
         }
diff --git a/tests/test_openapi_schema.py b/tests/test_openapi_schema.py
index aec67f472..c469e755f 100644
--- a/tests/test_openapi_schema.py
+++ b/tests/test_openapi_schema.py
@@ -17,6 +17,7 @@
 class Payload(Schema):
     i: int
     f: float
+    i_default: int = Field(1)
 
 
 class TypeA(Schema):
@@ -34,6 +35,7 @@ def to_camel(string: str) -> str:
 class Response(Schema):
     i: int
     f: float = Field(..., title="f title", description="f desc")
+    i_default: int = Field(1)
 
     class Config(Schema.Config):
         alias_generator = to_camel
@@ -208,8 +210,13 @@ def test_schema(schema):
             "properties": {
                 "i": {"title": "I", "type": "integer"},
                 "f": {"description": "f desc", "title": "f title", "type": "number"},
+                "i_default": {
+                    "default": 1,
+                    "title": "I Default",
+                    "type": "integer",
+                },
             },
-            "required": ["i", "f"],
+            "required": ["i", "f", "i_default"],
         },
         "Payload": {
             "title": "Payload",
@@ -217,6 +224,11 @@ def test_schema(schema):
             "properties": {
                 "i": {"title": "I", "type": "integer"},
                 "f": {"title": "F", "type": "number"},
+                "i_default": {
+                    "default": 1,
+                    "title": "I Default",
+                    "type": "integer",
+                },
             },
             "required": ["i", "f"],
         },
@@ -318,6 +330,11 @@ def test_schema_list(schema):
             "properties": {
                 "f": {"title": "F", "type": "number"},
                 "i": {"title": "I", "type": "integer"},
+                "i_default": {
+                    "default": 1,
+                    "title": "I Default",
+                    "type": "integer",
+                },
             },
             "required": ["i", "f"],
             "title": "Payload",
@@ -343,8 +360,13 @@ def test_schema_list(schema):
             "properties": {
                 "f": {"description": "f desc", "title": "f title", "type": "number"},
                 "i": {"title": "I", "type": "integer"},
+                "i_default": {
+                    "default": 1,
+                    "title": "I Default",
+                    "type": "integer",
+                },
             },
-            "required": ["i", "f"],
+            "required": ["i", "f", "i_default"],
             "title": "Response",
             "type": "object",
         },
@@ -447,6 +469,11 @@ def test_schema_form(schema):
                     "properties": {
                         "i": {"title": "I", "type": "integer"},
                         "f": {"title": "F", "type": "number"},
+                        "i_default": {
+                            "default": 1,
+                            "title": "I Default",
+                            "type": "integer",
+                        },
                     },
                     "required": ["i", "f"],
                 }
@@ -539,6 +566,11 @@ def test_schema_form_file(schema):
                         },
                         "i": {"title": "I", "type": "integer"},
                         "f": {"title": "F", "type": "number"},
+                        "i_default": {
+                            "default": 1,
+                            "title": "I Default",
+                            "type": "integer",
+                        },
                     },
                     "required": ["files", "i", "f"],
                     "title": "MultiPartBodyParams",