diff --git a/nanobot/config/schema.py b/nanobot/config/schema.py
index 2d99468a..290edcdd 100644
--- a/nanobot/config/schema.py
+++ b/nanobot/config/schema.py
@@ -401,6 +401,7 @@ class Config(BaseSettings):
     model_presets: dict[str, ModelPresetConfig] = Field(
         default_factory=dict,
         validation_alias=AliasChoices("modelPresets", "model_presets"),
+        serialization_alias="modelPresets",
     )
 
     def __init__(self, **values: Any) -> None: