diff --git a/requirements.txt b/requirements.txt
index 6db27b9..c8c3a31 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -60,7 +60,7 @@ ipaddress==1.0.16
 itsdangerous==0.24
 kombu==3.0.29
 lockfile==0.8
-lxml==3.3.3
+lxml==4.9.1
 matplotlib==1.3.1
 mechanize==0.2.5
 mixer==5.5.7