diff --git a/reflex/compiler/utils.py b/reflex/compiler/utils.py
index 33202e56b..497ee12a2 100644
--- a/reflex/compiler/utils.py
+++ b/reflex/compiler/utils.py
@@ -188,7 +188,7 @@ def _compile_client_storage_recursive(
     cookies = {}
     local_storage = {}
     state_name = state.get_full_name()
-    for name, field in state.__fields__.items():
+    for name, field in state.model_fields.items():
         if name in state.inherited_vars:
             # only include vars defined in this state
             continue
diff --git a/reflex/components/chakra/base.py b/reflex/components/chakra/base.py
index 9e1f3f698..a92906bda 100644
--- a/reflex/components/chakra/base.py
+++ b/reflex/components/chakra/base.py
@@ -70,7 +70,7 @@ class ChakraProvider(ChakraComponent):
 
     def _get_imports(self) -> imports.ImportDict:
         _imports = super()._get_imports()
-        _imports.setdefault(self.__fields__["library"].default, []).append(
+        _imports.setdefault(self.model_fields["library"].default, []).append(
             imports.ImportVar(tag="extendTheme", is_default=False),
         )
         _imports.setdefault("/utils/theme.js", []).append(
diff --git a/reflex/components/radix/themes/base.py b/reflex/components/radix/themes/base.py
index 590dd5089..28dc68f16 100644
--- a/reflex/components/radix/themes/base.py
+++ b/reflex/components/radix/themes/base.py
@@ -101,7 +101,7 @@ class RadixThemesComponent(Component):
         """
         component = super().create(*children, **props)
         if component.library is None:
-            component.library = RadixThemesComponent.__fields__["library"].default
+            component.library = RadixThemesComponent.model_fields["library"].default
         component.alias = "RadixThemes" + (
             component.tag or component.__class__.__name__
         )
diff --git a/reflex/model.py b/reflex/model.py
index cd1b141f7..f7396fad5 100644
--- a/reflex/model.py
+++ b/reflex/model.py
@@ -61,12 +61,12 @@ class Model(Base, sqlmodel.SQLModel):
         """Drop the default primary key field if any primary key field is defined."""
         non_default_primary_key_fields = [
             field_name
-            for field_name, field in cls.__fields__.items()
+            for field_name, field in cls.model_fields.items()
             if field_name != "id"
             and getattr(field.field_info, "primary_key", None) is True
         ]
         if non_default_primary_key_fields:
-            cls.__fields__.pop("id", None)
+            cls.model_fields.pop("id", None)
 
         super().__init_subclass__()
 
@@ -95,9 +95,9 @@ class Model(Base, sqlmodel.SQLModel):
         Returns:
             The object as a dictionary.
         """
-        base_fields = {name: getattr(self, name) for name in self.__fields__}
+        base_fields = {name: getattr(self, name) for name in self.model_fields}
         relationships = {}
-        # SQLModel relationships do not appear in __fields__, but should be included if present.
+        # SQLModel relationships do not appear in model_fields, but should be included if present.
         for name in self.__sqlmodel_relationships__:
             try:
                 relationships[name] = self._dict_recursive(getattr(self, name))
diff --git a/reflex/state.py b/reflex/state.py
index 9f6daf96e..d15d1f1a9 100644
--- a/reflex/state.py
+++ b/reflex/state.py
@@ -760,7 +760,7 @@ class BaseState(Base, ABC, extra=pydantic.Extra.allow):
         Raises:
             NameError: if a variable of this name already exists
         """
-        if name in cls.__fields__:
+        if name in cls.model_fields:
             raise NameError(
                 f"The variable '{name}' already exist. Use a different name"
             )
diff --git a/scripts/pyi_generator.py b/scripts/pyi_generator.py
index 2e8936d13..f18a300d0 100644
--- a/scripts/pyi_generator.py
+++ b/scripts/pyi_generator.py
@@ -373,7 +373,7 @@ def _extract_class_props_as_ast_nodes(
                 #       with the annotation in some cases.
                 with contextlib.suppress(AttributeError, KeyError):
                     # Try to get default from pydantic field definition.
-                    default = target_class.__fields__[name].default
+                    default = target_class.model_fields[name].default
                     if isinstance(default, Var):
                         default = default._decode()  # type: ignore
 
diff --git a/tests/test_model.py b/tests/test_model.py
index accab52fe..90ab3302b 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -45,7 +45,7 @@ def test_default_primary_key(model_default_primary):
     Args:
         model_default_primary: Fixture.
     """
-    assert "id" in model_default_primary.__class__.__fields__
+    assert "id" in model_default_primary.__class__.model_fields
 
 
 def test_custom_primary_key(model_custom_primary):
@@ -54,7 +54,7 @@ def test_custom_primary_key(model_custom_primary):
     Args:
         model_custom_primary: Fixture.
     """
-    assert "id" not in model_custom_primary.__class__.__fields__
+    assert "id" not in model_custom_primary.__class__.model_fields
 
 
 @pytest.mark.filterwarnings(