diff --git a/requirements.txt b/requirements.txt
index 70df52c..8be1d2d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ jupyter-client==5.3.4
 jupyter-core==4.6.1
 kiwisolver==1.1.0
 llvmlite==0.31.0
-lxml==4.4.2
+lxml==4.9.1
 Mako==1.1.0
 MarkupSafe==1.1.1
 matplotlib==3.1.1