diff --git a/requirements.txt b/requirements.txt
index f8be496..8ed2532 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ importlib-metadata==1.5.0
 iniconfig==1.0.1
 itsdangerous==0.24
 Jinja2==2.11.3
-lxml==4.6.4
+lxml==4.9.1
 MarkupSafe==2.0.1
 mccabe==0.6.1
 more-itertools==8.2.0