diff --git a/requirements.txt b/requirements.txt
index 703de1ea..2febc64d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ idna==2.8
 isodate==0.6.0
 jsonpickle==1.1
 jsonschema==3.0.0a3
-lxml==4.3.2
+lxml==4.6.3
 more-itertools==5.0.0
 networkx==2.2
 numpy==1.16.2