diff --git a/base_rest_demo/__manifest__.py b/base_rest_demo/__manifest__.py
index e51c6bbb1..13eeeb838 100644
--- a/base_rest_demo/__manifest__.py
+++ b/base_rest_demo/__manifest__.py
@@ -20,7 +20,7 @@
         "pydantic",
     ],
     "external_dependencies": {
-        "python": ["jsondiff", "extendable-pydantic", "marshmallow", "pydantic"]
+        "python": ["jsondiff", "extendable-pydantic>=1.0.0", "marshmallow", "pydantic>=2.0.0"]
     },
     "installable": True,
 }
diff --git a/base_rest_pydantic/__manifest__.py b/base_rest_pydantic/__manifest__.py
index ea83d15c9..5ad986429 100644
--- a/base_rest_pydantic/__manifest__.py
+++ b/base_rest_pydantic/__manifest__.py
@@ -13,7 +13,7 @@
     "installable": True,
     "external_dependencies": {
         "python": [
-            "pydantic",
+            "pydantic>=2.0.0",
         ]
     },
 }
diff --git a/base_rest_pydantic/restapi.py b/base_rest_pydantic/restapi.py
index 1966ea938..25cdd4909 100644
--- a/base_rest_pydantic/restapi.py
+++ b/base_rest_pydantic/restapi.py
@@ -1,23 +1,12 @@
 # Copyright 2021 ACSONE SA/NV
 # License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl).
-
+import json
 from odoo import _
 from odoo.exceptions import UserError
 
 from odoo.addons.base_rest import restapi
 
 from pydantic import BaseModel, ValidationError
-from pydantic.version import VERSION as PYDANTIC_VERSION
-
-PYDANTIC_V2 = PYDANTIC_VERSION.startswith("2.")
-
-if PYDANTIC_V2:
-
-    def validate_model(cls, data):
-        return cls.model_validate_json(data)
-
-else:
-    from pydantic import validate_model
 
 
 def replace_ref_in_schema(item, original_schema):
@@ -55,15 +44,20 @@ def from_params(self, service, params):
 
     def to_response(self, service, result):
         # do we really need to validate the instance????
-        json_dict = result.dict()
-        if PYDANTIC_V2:
-            orm_mode = result.model_config.get("from_attributes", None)
-        else:
-            orm_mode = result.__config__.orm_mode
-        to_validate = json_dict if orm_mode else result.dict(by_alias=True)
-        *_, validation_error = validate_model(self._model_cls, to_validate)
-        if validation_error:
-            raise SystemError(_("Invalid Response %s") % validation_error)
+        json_dict = result.model_dump()
+        orm_mode = result.model_config.get("from_attributes", None)
+        to_validate = json_dict if orm_mode else result.model_dump(by_alias=True)
+        # Ensure that to_validate is under json format
+        try:
+            json.loads(to_validate)
+            to_validate_jsonified = to_validate
+        except TypeError:
+            to_validate_jsonified = json.dumps(to_validate)
+
+        try:
+            self._model_cls.model_validate_json(to_validate_jsonified)
+        except ValidationError as validation_error:
+            raise SystemError(_("Invalid Response")) from validation_error
         return json_dict
 
     def to_openapi_query_parameters(self, servic, spec):
diff --git a/base_rest_pydantic/tests/test_from_params.py b/base_rest_pydantic/tests/test_from_params.py
index b376dde72..54e4074e9 100644
--- a/base_rest_pydantic/tests/test_from_params.py
+++ b/base_rest_pydantic/tests/test_from_params.py
@@ -16,7 +16,7 @@ def setUp(self):
         super(TestPydantic, self).setUp()
 
         class Model1(BaseModel):
-            name: str = None
+            name: str
             description: str = None
 
         self.Model1: BaseModel = Model1
@@ -33,7 +33,10 @@ def _from_params(self, pydantic_cls: Type[BaseModel], params: dict, **kwargs):
         return restapi_pydantic.from_params(mock_service, params)
 
     def test_from_params(self):
-        params = {"name": "Instance Name", "description": "Instance Description"}
+        params = {
+            "name": "Instance Name",
+            "description": "Instance Description",
+        }
         instance = self._from_params(self.Model1, params)
         self.assertEqual(instance.name, params["name"])
         self.assertEqual(instance.description, params["description"])
@@ -45,14 +48,20 @@ def test_from_params_missing_optional_field(self):
         self.assertIsNone(instance.description)
 
     def test_from_params_missing_required_field(self):
-        msg = r"value_error.missing"
+        msg = r"Field required"
         with self.assertRaisesRegex(UserError, msg):
             self._from_params(self.Model1, {"description": "Instance Description"})
 
     def test_from_params_pydantic_model_list(self):
         params = [
-            {"name": "Instance Name", "description": "Instance Description"},
-            {"name": "Instance Name 2", "description": "Instance Description 2"},
+            {
+                "name": "Instance Name",
+                "description": "Instance Description",
+            },
+            {
+                "name": "Instance Name 2",
+                "description": "Instance Description 2",
+            },
         ]
         instances = self._from_params(self.Model1, params)
         self.assertEqual(len(instances), 2)
diff --git a/base_rest_pydantic/tests/test_response.py b/base_rest_pydantic/tests/test_response.py
index fd8e7fd12..b1c5c40f8 100644
--- a/base_rest_pydantic/tests/test_response.py
+++ b/base_rest_pydantic/tests/test_response.py
@@ -31,11 +31,20 @@ class Model1(BaseModel):
         res = self._to_response(instance)
         self.assertEqual(res["name"], instance.name)
 
+    def test_to_response_validation_failed(self):
+        class Model1(BaseModel):
+            name: str = None
+
+        instance = Model1(named="Instance 1")
+        msg = r"Invalid Response"
+        with self.assertRaisesRegex(SystemError, msg):
+            self._to_response(instance)
+
     def test_to_response_list(self):
         class Model1(BaseModel):
             name: str = None
 
-        instances = (Model1(name="Instance 1"), Model1(name="Instance 2"))
+        instances = [Model1(name="Instance 1"), Model1(name="Instance 2")]
         res = self._to_response_list(instances)
         self.assertEqual(len(res), 2)
         self.assertSetEqual({r["name"] for r in res}, {"Instance 1", "Instance 2"})