update

app.py

@@ -9,7 +9,7 @@ from operator import  itemgetter
 from langchain_core.runnables import RunnablePassthrough
 from langchain_core.output_parsers import StrOutputParser
 from langchain_openai import ChatOpenAI, OpenAIEmbeddings
-from langchain_community.vectorstores import FAISS
+from langchain.vectorstores import FAISS
 from langchain_openai import OpenAIEmbeddings
 from langchain.retrievers import MultiQueryRetriever
 from langchain.chains.combine_documents import create_stuff_documents_chain