diff --git a/requirements.txt b/requirements.txt
index d19e293..59eedb9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -76,7 +76,7 @@ Keras==2.2.0
 Keras-Applications==1.0.2
 Keras-Preprocessing==1.0.1
 language-check==1.1
-lxml==4.2.1
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.1.2