diff --git a/requirements.txt b/requirements.txt
index 4d63a57..6e7a6e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ Keras==2.2.4
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 kiwisolver==1.2.0
-lxml==4.5.0
+lxml==4.9.1
 Markdown==3.2.1
 MarkupSafe==1.1.1
 matplotlib==3.2.1