diff --git a/requirements.txt b/requirements.txt
index f867fc6..db5ad01 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,5 @@ starlette==0.35.1
 pydantic==2.5.3
 sentence-transformers==2.5.1
 pymysql
-pytz
\ No newline at end of file
+pytz
+langchain
\ No newline at end of file