Update app.py

app.py

@@ -538,12 +538,12 @@ with gr.Blocks(
     )
 
     upvote_btn.click(
-        fn=upvote_last_response, inputs=[chatbot], outputs=[], api_name="upvote_last_response"
+        fn=upvote_last_response, inputs=chatbot, outputs=chatbot, api_name="upvote_last_response"
     )
 
     
     downvote_btn.click(
-        fn=downvote_last_response, inputs=[chatbot], outputs=[], api_name="downvote_last_response"
+        fn=downvote_last_response, inputs=chatbot, outputs=chatbot, api_name="downvote_last_response"
     )