diff --git a/requirements.txt b/requirements.txt
index 692c40e..38ef6b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ graphviz==0.13.2
 idna==2.9
 isodate==0.6.0
 jdcal==1.4.1
-lxml==4.6.3
+lxml==4.9.1
 netsuitesdk==1.3.0
 ntlm-auth==1.5.0
 oauthlib==3.1.0