diff --git a/docs/usage.md b/docs/usage.md
index 817afe5..00bb4d7 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -174,7 +174,7 @@ be raised. A schema can be added after instantiation through a setter:
 config.schema = MySchema
 ```
 
-## Casting and default values
+### Casting and default values
 
 By default, `maison` will replace the values in the config with whatever comes back from
 the validation. For example, for a config file that looks like this:
@@ -187,7 +187,11 @@ foo = 1
 And a schema that looks like this:
 
 ```python
+from pydantic import BaseModel, ConfigDict
+
 class MySchema(BaseModel):
+  model_config = ConfigDict(coerce_numbers_to_str=True)
+
   foo: str
   bar: str = "my_default"
 ```
diff --git a/tests/unit/test_config.py b/tests/unit/test_config.py
index 3bb942f..9b02c6c 100644
--- a/tests/unit/test_config.py
+++ b/tests/unit/test_config.py
@@ -5,6 +5,7 @@
 
 import pytest
 from pydantic import BaseModel
+from pydantic import ConfigDict
 from pydantic import ValidationError
 
 from maison.config import UserConfig
@@ -205,9 +206,11 @@ def test_use_schema_values(
     ) -> None:
         """Config values can be cast to the validated values."""
 
-        class Schema(BaseModel, coerce_numbers_to_str=True):
+        class Schema(BaseModel):
             """Defines schema."""
 
+            model_config = ConfigDict(coerce_numbers_to_str=True)
+
             bar: str
             other: str = "hello"
 
@@ -229,9 +232,11 @@ def test_not_use_schema_values(
     ) -> None:
         """If `use_schema_values` is set to False then don't use validated values."""
 
-        class Schema(BaseModel, coerce_numbers_to_str=True):
+        class Schema(BaseModel):
             """Defines schema."""
 
+            model_config = ConfigDict(coerce_numbers_to_str=True)
+
             bar: str
             other: str = "hello"