diff --git a/requirements.txt b/requirements.txt
index f0e7bc850..8d296aa5b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -96,7 +96,7 @@ itypes==1.1.0
 jdcal==1.3
 Jinja2==2.10
 kombu==4.1.0
-lxml==3.6.2
+lxml==4.6.2
 Mako==1.0.7
 MarkupSafe==1.0
 mccabe==0.4.0