diff --git a/requirements.txt b/requirements.txt
index 4489df3..08d625c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ imagesize==1.2.0
 Jinja2==2.11.3
 joblib==0.16.0
 kiwisolver==1.2.0
-lxml==4.6.5
+lxml==4.9.1
 macholib==1.14
 MarkupSafe==1.1.1
 matplotlib==3.2.1