diff --git a/flit.ini b/flit.ini
index 2749627..72f01a7 100644
--- a/flit.ini
+++ b/flit.ini
@@ -7,6 +7,7 @@ maintainer-email = git@louie.lu
 home-page = https://github.com/mlouielu/twstock
 requires-python = >=3
 requires=requests
+    lxml
 description-file = README.md
 classifiers = License :: OSI Approved :: MIT License
     Programming Language :: Python :: 3