diff --git a/requirements.txt b/requirements.txt
index 5ee46ee..3f0da34 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ cryptography==3.2
 cssselect==0.9.1
 dicttoxml==1.5.6
 html2text==2014.9.25
-lxml==3.4.0
+lxml==4.9.1
 pyOpenSSL==0.14
 pyasn1==0.1.7
 pyasn1-modules==0.0.5