diff --git a/nanobot/config/schema.py b/nanobot/config/schema.py
index f6c861d..19feba4 100644
--- a/nanobot/config/schema.py
+++ b/nanobot/config/schema.py
@@ -1,7 +1,7 @@
 """Configuration schema using Pydantic."""
 
 from pathlib import Path
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, ConfigDict
 from pydantic_settings import BaseSettings
 
 
@@ -281,6 +281,7 @@ class Config(BaseSettings):
                 return spec.default_api_base
         return None
     
-    class Config:
-        env_prefix = "NANOBOT_"
-        env_nested_delimiter = "__"
+    model_config = ConfigDict(
+        env_prefix="NANOBOT_",
+        env_nested_delimiter="__"
+    )