diff --git a/requirements.txt b/requirements.txt
index 511f917..918a7c7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ jsonschema==3.2.0
 jupyter-client==6.1.3
 jupyter-core==4.6.3
 kiwisolver==1.2.0
-lxml==4.5.0
+lxml==4.6.3
 matplotlib==3.2.1
 nbformat==5.0.6
 numpy==1.18.4