diff --git a/requirements.txt b/requirements.txt
index 0451e9c..a925a89 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ httplib2==0.10.3
 html2text==2018.1.9
 html5lib==0.999999999
 kombu==3.0.33
-lxml==4.2.5
+lxml==4.9.1
 pyasn1==0.1.9
 pyasn1-modules==0.0.8
 rsa==3.4.2