diff --git a/requirements.txt b/requirements.txt
index 7de0460..af534ac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,5 +22,5 @@ six==1.11.0
 urllib3==1.23
 virtualenv==16.0.0
 pykerberos==1.2.1
-lxml==4.3.2
+lxml==4.9.1
 pymongo==3.7.1