diff --git a/requirements.txt b/requirements.txt
index 14b9333..cf95e2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ jedi==0.17.0
 Jinja2==2.11.2
 joblib==0.14.1
 kiwisolver==1.2.0
-lxml==4.5.0
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.2.1
 networkx==2.4