diff --git a/requirements.txt b/requirements.txt
index 5e0bde0..b18d72e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -94,7 +94,7 @@ kombu==3.0.37
 lazy-object-proxy==1.4.2
 locustio==0.11.0
 logzero==1.5.0
-lxml==4.4.2
+lxml==4.9.1
 Mako==1.1.0
 markdown2==2.3.8
 MarkupSafe==1.1.1