diff --git a/backend/requirements.txt b/backend/requirements.txt
index fb3a1d4..6f079ac 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -11,6 +11,7 @@ passlib[bcrypt]
 python-multipart
 aiofiles
 httpx
+lxml
 alembic
 email-validator
 playwright  # PDF capture for performance check reports