diff --git a/nlp/requirements.txt b/nlp/requirements.txt
index 7b8e643..801a23c 100644
--- a/nlp/requirements.txt
+++ b/nlp/requirements.txt
@@ -51,7 +51,7 @@ lazr.restfulclient==0.13.5
 lazr.uri==1.0.3
 lightdm-gtk-greeter-settings==1.2.2
 louis==3.5.0
-lxml==4.2.1
+lxml==4.9.1
 macaroonbakery==1.1.3
 Mako==1.0.7
 Markdown==3.1.1