diff --git a/requirements.txt b/requirements.txt
index c1fb2ba..812c85b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ Keras-Applications==1.0.7
 Keras-Preprocessing==1.0.9
 kiwisolver==1.0.1
 lazy-object-proxy==1.3.1
-lxml==4.3.2
+lxml==4.9.1
 Markdown==3.0.1
 matplotlib==2.2.4
 mccabe==0.6.1