diff --git a/requirements.txt b/requirements.txt
index 32135db..2cb9ba0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ jupyter-client==5.2.3
 jupyter-console==5.2.0
 jupyter-core==4.4.0
 kiwisolver==1.0.1
-lxml==3.7.3
+lxml==4.6.5
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.0