diff --git a/requirements.txt b/requirements.txt
index 5d64c62..5e8b467 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Flask==0.12.2
-lxml==4.1.1
+lxml==4.9.1
 MarkupSafe==1.0
 pymongo==3.6.0
 python-crontab==2.2.8