diff --git a/requirements.txt b/requirements.txt
index ede2b9f..8622c3b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ Keras==2.3.1
 Keras-Applications==1.0.8
 Keras-Preprocessing==1.1.0
 kiwisolver==1.1.0
-lxml==4.4.2
+lxml==4.9.1
 Markdown==3.1.1
 matplotlib==3.0.3
 nltk==3.4.5