diff --git a/requirements.txt b/requirements.txt
index de632ee..9b3c717 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ itsdangerous==1.1.0
 jdcal==1.4
 Jinja2==2.10
 kombu==4.2.2.post1
-lxml==4.2.5
+lxml==4.9.1
 MarkupSafe==1.1.0
 mixpanel==4.3.2
 numpy==1.15.4