diff --git a/requirements.txt b/requirements.txt
index 7b47fc1..34d07cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ enum34==1.1.6
 futures==3.3.0;python_version<"2.7"
 idna==2.8
 ipaddress==1.0.22
-lxml==4.4.1
+lxml==4.6.3
 pycparser==2.19
 pyOpenSSL==19.0.0
 requests==2.22.0