diff --git a/requirements.txt b/requirements.txt
index 919f31a..24db818 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ httplib2==0.8
 itsdangerous==0.24
 Jinja2==2.8
 lockfile==0.8
-lxml==3.3.3
+lxml==4.9.1
 MarkupSafe==0.23
 oauthlib==0.6.1
 oneconf==0.3.7