diff --git a/requirements.txt b/requirements.txt
index 919722c..34d0e06 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ cffi==1.14.4
 chardet==3.0.4
 cryptography==3.2.1
 idna==2.10
-lxml==4.6.2
+lxml==4.9.1
 ntlm-auth==1.5.0
 pkg-resources==0.0.0
 pycparser==2.20