diff --git a/requirements.txt b/requirements.txt
index 8d5be48..a1717d6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ imapclient==2.1.0
 jmespath==0.9.4
 kaitaistruct==0.8
 ldap3==2.5.2
-lxml==4.4.1
+lxml==4.9.1
 mitmproxy==4.0.4
 ntlm-auth==1.3.0
 passlib==1.7.1