diff --git a/setup/requirements.txt b/setup/requirements.txt
index f93f125..4c436b1 100644
--- a/setup/requirements.txt
+++ b/setup/requirements.txt
@@ -38,7 +38,7 @@ jupyter-core==4.3.0
 jupyterhub==0.8.0
 language-selector==0.1
 louis==2.6.4
-lxml==3.5.0
+lxml==4.6.3
 Mako==1.0.3
 MarkupSafe==1.0
 matplotlib==1.5.1