diff --git a/requirements.txt b/requirements.txt
index 4149f08..8f996f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ ipython==7.8.0
 ipython-genutils==0.2.0
 isodate==0.6.0
 jedi==0.15.1
-lxml==4.4.1
+lxml==4.9.1
 M2Crypto==0.35.2
 parso==0.5.1
 pexpect==4.7.0