diff --git a/requirements.txt b/requirements.txt
index 58d13e8..65c18f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ Keras-Applications==1.0.7
 Keras-Preprocessing==1.0.9
 kiwisolver==1.0.1
 lockfile==0.12.2
-lxml==4.4.2
+lxml==4.9.1
 Markdown==3.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2