diff --git a/requirements.txt b/requirements.txt
index 8cbbadc..e64000c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ jupyter-client==5.1.0
 jupyter-console==5.2.0
 jupyter-core==4.3.0
 Keras==2.1.1
-lxml==4.1.1
+lxml==4.9.1
 MarkupSafe==1.0
 mistune==0.7.4
 nbconvert==5.3.1