diff --git a/app/models/openai_models.py b/app/models/openai_models.py
index 71534ba..b352ce1 100644
--- a/app/models/openai_models.py
+++ b/app/models/openai_models.py
@@ -10,7 +10,7 @@ from pydantic import BaseModel, Field
 
 class ChatMessage(BaseModel):
     """A chat message in the conversation."""
-    role: Literal["system", "user", "assistant", "function", "tool"]
+    role: Literal["system", "user", "assistant", "function", "tool", "developer"]
     content: Optional[str] = None
     name: Optional[str] = None
     function_call: Optional[Dict[str, Any]] = None