diff --git a/requirements.txt b/requirements.txt
index ceb62b6..1a9a137 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ jupyter-console==6.1.0
 jupyter-core==4.6.3
 kiwisolver==1.2.0
 lazy-object-proxy==1.4.3
-lxml==4.5.0
+lxml==4.9.1
 Mako==1.1.2
 MarkupSafe==1.1.1
 matplotlib==3.2.1