diff --git a/autogpts/forge/forge/sdk/model.py b/autogpts/forge/forge/sdk/model.py
index 238caae8..6a55b5a2 100644
--- a/autogpts/forge/forge/sdk/model.py
+++ b/autogpts/forge/forge/sdk/model.py
@@ -73,7 +73,7 @@ class TaskRequestBody(BaseModel):
         description="Input prompt for the task.",
         example="Write the words you receive to the file 'output.txt'.",
     )
-    additional_input: Optional[dict] = {}
+    additional_input: Optional[dict] = None
 
 
 class Task(TaskRequestBody):