diff --git a/requirements.txt b/requirements.txt
index 387557e..bb80f66 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ imageio==2.5.0
 importlib-metadata==0.19
 joblib==0.17.0
 kiwisolver==1.1.0
-lxml==4.6.2
+lxml==4.9.1
 matplotlib==3.1.1
 more-itertools==7.2.0
 munch==2.3.2