diff --git a/requirements.txt b/requirements.txt
index 72283f5..fb982cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ Keras==2.2.4
 Keras-Applications==1.0.6
 Keras-Preprocessing==1.0.5
 kiwisolver==1.0.1
-lxml==4.2.5
+lxml==4.9.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
 networkx==2.2