diff --git a/litellm/proxy/_types.py b/litellm/proxy/_types.py
index 0fa7b7fc036..2c2fee5dbc2 100644
--- a/litellm/proxy/_types.py
+++ b/litellm/proxy/_types.py
@@ -1431,6 +1431,8 @@ class UserAPIKeyAuth(
     user_tpm_limit: Optional[int] = None
     user_rpm_limit: Optional[int] = None
 
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
     @model_validator(mode="before")
     @classmethod
     def check_api_key(cls, values):
@@ -1442,9 +1444,6 @@ class UserAPIKeyAuth(
                 values.update({"api_key": hash_token(values.get("api_key"))})
         return values
 
-    class Config:
-        arbitrary_types_allowed = True
-
 
 class UserInfoResponse(LiteLLMPydanticObjectBase):
     user_id: Optional[str]