fix

backend/requirements.txt

@@ -33,8 +33,8 @@ anthropic
 google-generativeai==0.7.2
 tiktoken
 
-langchain==0.2.6
-langchain-community==0.2.9
+langchain==0.2.11
+langchain-community==0.2.10
 langchain-chroma==0.1.2
 
 fake-useragent==1.5.1