diff --git a/requirements.txt b/requirements.txt
index 45e3305..f4eeab9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ Keras==2.2.4
 Keras-Applications==1.0.6
 Keras-Preprocessing==1.0.5
 kiwisolver==1.1.0
-lxml==4.4.0
+lxml==4.9.1
 Markdown==3.0.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1