diff --git a/requirements.txt b/requirements.txt
index e052384..777a36c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ Jinja2==2.8
 kazam==1.4.5
 language-selector==0.1
 louis==2.6.4
-lxml==3.5.0
+lxml==4.9.1
 Mako==1.0.3
 MarkupSafe==0.23
 matplotlib==2.1.0