diff --git a/requirements.txt b/requirements.txt
index 7f521e3..62ab9bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ jedi==0.11.1
 Jinja2==3.0.3
 lazy-object-proxy==1.3.1
 limits==1.3
-lxml==4.1.1
+lxml==4.9.1
 Mako==1.0.7
 MarkupSafe==2.0.1
 mccabe==0.6.1