diff --git a/requirements.txt b/requirements.txt
index 5b4de54..5f48952 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ jupyter-client==5.3.1
 jupyter-console==6.0.0
 jupyter-core==4.5.0
 lazy-object-proxy==1.4.3
-lxml==4.4.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 mistune==0.8.4