diff --git a/requirements.txt b/requirements.txt
index ac3338d..61890e7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ IPy==0.75
 ipython==3.2.1
 Jinja2==2.7.3
 jsonschema==2.5.1
-lxml==3.6.0
+lxml==4.6.3
 MarkupSafe==0.23
 mistune==0.7
 mpmath==0.19