diff --git a/requirements.txt b/requirements.txt
index d50b497..303da38 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ jedi==0.17.2
 Jinja2==2.11.2
 jupyter-client==6.1.6
 jupyter-core==4.6.3
-lxml==4.5.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 numpy==1.19.1
 pandas==1.1.0