diff --git a/requirements.txt b/requirements.txt
index b6d9143..4ec796d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ jupyter-core==4.4.0
 kiwisolver==1.0.1
 lazy-object-proxy==1.3.1
 lockfile==0.12.2
-lxml==4.6.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mccabe==0.6.1