diff --git a/aiohttp_pydantic/injectors.py b/aiohttp_pydantic/injectors.py
index d9378a6..d8d29bc 100644
--- a/aiohttp_pydantic/injectors.py
+++ b/aiohttp_pydantic/injectors.py
@@ -85,7 +85,7 @@ class BodyGetter(AbstractInjector):
         # to a dict. Prevent this by requiring the body to be a dict for object models.
         if self._expect_object and not isinstance(body, dict):
             raise HTTPBadRequest(
-                text='[{"in": "body", "loc": ["__root__"], "msg": "value is not a '
+                text='[{"loc_in": "body", "loc": ["root"], "msg": "value is not a '
                 'valid dict", "type": "type_error.dict"}]',
                 content_type="application/json",
             ) from None
diff --git a/aiohttp_pydantic/oas/view.py b/aiohttp_pydantic/oas/view.py
index 5d184f5..adc0ca0 100644
--- a/aiohttp_pydantic/oas/view.py
+++ b/aiohttp_pydantic/oas/view.py
@@ -5,7 +5,7 @@ from typing import List, Type, Optional, get_type_hints
 
 from aiohttp.web import Response, json_response
 from aiohttp.web_app import Application
-from pydantic import BaseModel
+from pydantic import BaseModel, RootModel
 
 from aiohttp_pydantic.oas.struct import OpenApiSpec3, OperationObject, PathItem
 from . import docstring_parser
@@ -32,7 +32,7 @@ class _OASResponseBuilder:
             response_schema = obj.schema(
                 ref_template="#/components/schemas/{model}"
             ).copy()
-            if def_sub_schemas := response_schema.pop("definitions", None):
+            if def_sub_schemas := response_schema.pop("$defs", None):
                 self._oas.components.schemas.update(def_sub_schemas)
             self._oas.components.schemas.update({response_schema['title']: response_schema})
             return {'$ref': f'#/components/schemas/{response_schema["title"]}'}
@@ -99,7 +99,7 @@ def _add_http_method_to_oas(
             .schema(ref_template="#/components/schemas/{model}")
             .copy()
         )
-        if def_sub_schemas := body_schema.pop("definitions", None):
+        if def_sub_schemas := body_schema.pop("$defs", None):
             oas.components.schemas.update(def_sub_schemas)
 
         oas_operation.request_body.content = {
@@ -117,19 +117,19 @@ def _add_http_method_to_oas(
             oas_operation.parameters[i].in_ = args_location
             oas_operation.parameters[i].name = name
 
-            attrs = {"__annotations__": {"__root__": type_}}
+            attrs = {"__annotations__": {"root": type_}}
             if name in defaults:
-                attrs["__root__"] = defaults[name]
+                attrs["root"] = defaults[name]
                 oas_operation.parameters[i].required = False
             else:
                 oas_operation.parameters[i].required = True
 
-            oas_operation.parameters[i].schema = type(name, (BaseModel,), attrs).schema(
+            oas_operation.parameters[i].schema = type(name, (RootModel,), attrs).schema(
                 ref_template="#/components/schemas/{model}"
             )
 
             # move definitions
-            if def_sub_schemas := oas_operation.parameters[i].schema.pop("definitions", None):
+            if def_sub_schemas := oas_operation.parameters[i].schema.pop("$defs", None):
                 oas.components.schemas.update(def_sub_schemas)
 
     return_type = get_type_hints(handler).get("return")
diff --git a/requirements/ci.txt b/requirements/ci.txt
index e54ae95..ceaefd4 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -1,42 +1,11 @@
-aiohttp==3.8.1
-aiosignal==1.2.0
-async-timeout==4.0.2
-atomicwrites==1.4.1
-attrs==21.4.0
-bleach==5.0.1
-certifi==2022.6.15
-charset-normalizer==2.1.0
-codecov==2.1.12
-colorama==0.4.5
-commonmark==0.9.1
-coverage==6.4.2
-docutils==0.19
-frozenlist==1.3.0
-idna==3.3
-importlib-metadata==4.12.0
-iniconfig==1.1.1
-keyring==23.7.0
-multidict==6.0.2
-packaging==21.3
-pkginfo==1.8.3
-pluggy==1.0.0
-py==1.11.0
-Pygments==2.12.0
-pyparsing==3.0.9
-pytest==7.1.2
+aiohttp==3.8.4
+pydantic==2.0.2
+jinja2==3.1.2
+swagger-4-ui-bundle==0.0.4
+pytest==7.4.0
 pytest-aiohttp==1.0.4
-pytest-asyncio==0.19.0
-pytest-cov==3.0.0
-pywin32-ctypes==0.2.0
-readme-renderer==35.0
-requests==2.28.1
-requests-toolbelt==0.9.1
-rfc3986==2.0.0
-rich==12.5.1
-six==1.16.0
-tomli==2.0.1
-twine==4.0.1
-urllib3==1.26.11
-webencodings==0.5.1
-yarl==1.7.2
-zipp==3.8.1
+pytest-asyncio==0.21.1
+pytest-cov==4.1.0
+readme-renderer==40.0
+codecov==2.1.13
+twine==4.0.2
\ No newline at end of file
diff --git a/requirements/test.txt b/requirements/test.txt
index 1565277..70cee9f 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -6,3 +6,4 @@ pytest==7.4.0
 pytest-aiohttp==1.0.4
 pytest-asyncio==0.21.1
 pytest-cov==4.1.0
+readme-renderer==40.0
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index d2863f1..6dbb243 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -36,14 +36,14 @@ install_requires =
 
 [options.extras_require]
 test =
-    pytest==7.1.2
+    pytest==7.4.0
     pytest-aiohttp==1.0.4
-    pytest-cov==3.0.0
-    readme-renderer==35.0
+    pytest-cov==4.1.0
+    readme-renderer==40.0
 ci =
     %(test)s
-    codecov==2.1.12
-    twine==4.0.1
+    codecov==2.1.13
+    twine==4.0.2
 
 [options.packages.find]
 exclude =
diff --git a/tests/test_oas/test_view.py b/tests/test_oas/test_view.py
index 391accd..679c236 100644
--- a/tests/test_oas/test_view.py
+++ b/tests/test_oas/test_view.py
@@ -16,6 +16,9 @@ from aiohttp_pydantic.oas.view import generate_oas
 
 
 class Color(str, Enum):
+    """
+    Pet color
+    """
     RED = "red"
     GREEN = "green"
     PINK = "pink"
@@ -142,22 +145,18 @@ async def generated_oas(aiohttp_client, event_loop) -> web.Application:
 async def test_generated_oas_should_have_components_schemas(generated_oas):
     assert generated_oas["components"]["schemas"] == {
         'Cat': {'properties': {'meows': {'title': 'Meows', 'type': 'integer'},
-                               'pet_type': {'enum': ['cat'],
-                                            'title': 'Pet Type',
-                                            'type': 'string'}},
+                               'pet_type': {'const': 'cat', 'title': 'Pet Type'}},
                 'required': ['pet_type', 'meows'],
                 'title': 'Cat',
                 'type': 'object'},
         "Color": {
-            "description": "An enumeration.",
+            "description": "Pet color",
             "enum": ["red", "green", "pink"],
             "title": "Color",
             "type": "string",
         },
         'Dog': {'properties': {'barks': {'title': 'Barks', 'type': 'number'},
-                               'pet_type': {'enum': ['dog'],
-                                            'title': 'Pet Type',
-                                            'type': 'string'}},
+                               'pet_type': {'const': 'dog', 'title': 'Pet Type'}},
                 'required': ['pet_type', 'barks'],
                 'title': 'Dog',
                 'type': 'object'},
@@ -170,7 +169,6 @@ async def test_generated_oas_should_have_components_schemas(generated_oas):
             'type': 'object'
         },
         'Lang': {
-            'description': 'An enumeration.',
             'enum': ['en', 'fr'],
             'title': 'Lang',
             'type': 'string'
@@ -187,7 +185,13 @@ async def test_generated_oas_should_have_components_schemas(generated_oas):
         'Pet': {
             'properties': {
                 'id': {'title': 'Id', 'type': 'integer'},
-                'name': {'title': 'Name', 'type': 'string'},
+                'name': {
+                    'anyOf': [
+                        {'type': 'string'},
+                        {'type': 'null'}
+                    ],
+                    'default': None,
+                    'title': 'Name'},
                 'toys': {
                     'items': {'$ref': '#/components/schemas/Toy'},
                     'title': 'Toys',
@@ -231,13 +235,24 @@ async def test_pets_route_should_have_get_method(generated_oas):
                 "in": "query",
                 "name": "name",
                 "required": False,
-                "schema": {"title": "name", "type": "string"},
+                "schema": {
+                    'anyOf': [{'type': 'string'}, {'type': 'null'}],
+                    'default': None,
+                    'title': 'name'
+                },
             },
             {
                 "in": "header",
                 "name": "promo",
                 "required": False,
-                "schema": {"format": "uuid", "title": "promo", "type": "string"},
+                "schema": {
+                    'anyOf': [
+                        {'format': 'uuid', 'type': 'string'},
+                        {'type': 'null'}
+                    ],
+                    'default': None,
+                    'title': 'promo'
+                },
             },
         ],
         "responses": {
@@ -265,7 +280,14 @@ async def test_pets_route_should_have_post_method(generated_oas):
                     "schema": {
                         "properties": {
                             "id": {"title": "Id", "type": "integer"},
-                            "name": {"title": "Name", "type": "string"},
+                            "name": {
+                                'anyOf': [
+                                    {'type': 'string'},
+                                    {'type': 'null'}
+                                ],
+                                'default': None,
+                                'title': 'Name'
+                            },
                             "toys": {
                                 "items": {"$ref": "#/components/schemas/Toy"},
                                 "title": "Toys",
@@ -337,9 +359,9 @@ async def test_pets_id_route_should_have_get_method(generated_oas):
                 "name": "day",
                 "required": False,
                 "schema": {
-                    "anyOf": [{"type": "integer"}, {"enum": ["now"], "type": "string"}],
-                    "default": "now",
-                    "title": "day",
+                    'anyOf': [{'type': 'integer'}, {'const': 'now'}],
+                    'default': 'now',
+                    'title': 'day'
                 },
             },
         ],
@@ -370,7 +392,13 @@ async def test_pets_id_route_should_have_put_method(generated_oas):
                     "schema": {
                         "properties": {
                             "id": {"title": "Id", "type": "integer"},
-                            "name": {"title": "Name", "type": "string"},
+                            "name": {
+                                'anyOf': [
+                                    {'type': 'string'},
+                                    {'type': 'null'}
+                                ],
+                                'default': None,
+                                'title': 'Name'},
                             "toys": {
                                 "items": {"$ref": "#/components/schemas/Toy"},
                                 "title": "Toys",
diff --git a/tests/test_validation_body.py b/tests/test_validation_body.py
index 24dec50..31e6331 100644
--- a/tests/test_validation_body.py
+++ b/tests/test_validation_body.py
@@ -97,10 +97,10 @@ async def test_post_an_array_json_to_an_object_model_should_return_an_error(
     assert resp.content_type == "application/json"
     assert await resp.json() == [
         {
-            "in": "body",
-            "loc": ["__root__"],
-            "msg": "value is not a valid dict",
-            "type": "type_error.dict",
+            'loc': ['root'],
+            'loc_in': 'body',
+            'msg': 'value is not a valid dict',
+            'type': 'type_error.dict'
         }
     ]