diff --git a/requirements.txt b/requirements.txt
index 53a9965..324cd19 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ jupyter-core==4.7.1
 jupyterlab-pygments==0.1.2
 jupyterlab-widgets==1.0.0
 kiwisolver==1.3.1
-lxml==4.6.3
+lxml==4.9.1
 MarkupSafe==2.0.1
 matplotlib==3.4.2
 matplotlib-inline==0.1.2