diff --git a/requirements.txt b/requirements.txt
index 0054864..c44298b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ jedi==0.17.0
 Jinja2==2.11.2
 jupyter-client==6.1.3
 jupyter-core==4.6.3
-lxml==4.5.1
+lxml==4.9.1
 MarkupSafe==1.1.1
 oauthlib==3.1.0
 parso==0.7.0