diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index f544de4..d601608 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -53,7 +53,7 @@ jupyter-console==6.0.0
 jupyter-core==4.4.0
 language-selector==0.1
 louis==2.6.4
-lxml==3.5.0
+lxml==4.9.1
 Mako==1.0.3
 MarkupSafe==1.1.0
 matplotlib==1.5.1