diff --git a/requirements.txt b/requirements.txt
index 76d9af9..2f5dc7d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ isodate==0.5.4
 itypes==1.1.0
 Jinja2==2.10.1
 ldap3==2.6
-lxml==3.8.0
+lxml==4.6.5
 Markdown==3.1
 MarkupSafe==1.1.1
 ntlm-auth==1.3.0