diff --git a/requirements.txt b/requirements.txt
index 50448ae..ee1bf48 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ invoke==1.2.0
 ipython==7.4.0
 ipython-genutils==0.2.0
 jedi==0.13.3
-lxml==4.4.1
+lxml==4.9.1
 Markdown==3.1.1
 nose==1.3.7
 paramiko==2.4.2