diff --git a/requirements.txt b/requirements.txt
index 97056a1..4931845 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-lxml==4.4.2
+lxml==4.9.1
 numpy==1.18.1
 pandas==0.25.3
 python-dateutil==2.8.1