diff --git a/pydantic_settings/main.py b/pydantic_settings/main.py
index c5255d12..88478f16 100644
--- a/pydantic_settings/main.py
+++ b/pydantic_settings/main.py
@@ -127,4 +127,5 @@ def _settings_build_values(
         env_file_encoding=None,
         env_nested_delimiter=None,
         secrets_dir=None,
+        protected_namespaces=('model_', 'settings_'),
     )
diff --git a/pyproject.toml b/pyproject.toml
index 99b42538..9ec4ea86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ classifiers = [
 ]
 requires-python = '>=3.7'
 dependencies = [
-    'pydantic>=2.0a4',
+    'pydantic>=2.0b1',
     'python-dotenv>=0.21.0',
 ]
 dynamic = ['version']
diff --git a/requirements/pyproject.txt b/requirements/pyproject.txt
index 2ae6426b..f893da0e 100644
--- a/requirements/pyproject.txt
+++ b/requirements/pyproject.txt
@@ -6,9 +6,9 @@
 #
 annotated-types==0.4.0
     # via pydantic
-pydantic==2.0a4
+pydantic==2.0b1
     # via pydantic-settings (pyproject.toml)
-pydantic-core==0.30.0
+pydantic-core==0.38.0
     # via pydantic
 python-dotenv==0.21.1
     # via pydantic-settings (pyproject.toml)
diff --git a/tests/test_settings.py b/tests/test_settings.py
index b4ea8fe6..683f12b4 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -1614,3 +1614,19 @@ class Settings(BaseSettings):
     assert s.v0 == 'v0'
     assert s.sub_model.v1 == 'v1'
     assert s.sub_model.v2 == b'v2'
+
+
+def test_protected_namespace_defaults():
+    # pydantic default
+    with pytest.raises(NameError, match='Field "model_prefixed_field" has conflict with protected namespace "model_"'):
+
+        class Model(BaseSettings):
+            model_prefixed_field: str
+
+    # pydantic-settings default
+    with pytest.raises(
+        NameError, match='Field "settings_prefixed_field" has conflict with protected namespace "settings_"'
+    ):
+
+        class Model1(BaseSettings):
+            settings_prefixed_field: str