diff --git a/requirements.txt b/requirements.txt
index 834666a..399de98 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ greenlet==0.4.13
 idna==2.7
 ipaddress==1.0.22
 kombu==3.0.30
-lxml==3.3.6
+lxml==4.6.3
 MySQL-python==1.2.5
 oauthlib==0.6.2
 paho-mqtt==1.3.1