diff --git a/requirements.txt b/requirements.txt
index 1f0f179..5671d49 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ Jinja2==2.10.1
 jupyter-client==5.3.1
 jupyter-core==4.5.0
 kiwisolver==1.1.0
-lxml==4.4.0
+lxml==4.6.3
 MarkupSafe==1.1.1
 matplotlib==3.1.1
 numpy==1.17.0