diff --git a/requirements.txt b/requirements.txt
index 8e310f7..318ab6d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ Jinja2==2.10.3
 Keras==2.4.3
 Keras-Preprocessing==1.1.2
 kiwisolver==1.2.0
-lxml==4.4.1
+lxml==4.9.1
 macholib==1.11
 Markdown==3.2.2
 MarkupSafe==1.1.1