diff --git a/requirements.txt b/requirements.txt
index 0097b3f..a108ec1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ cloudpickle==0.2.2
 docutils==0.13.1
 doit==0.30.3
 Logbook==1.0.0
-lxml==3.7.3
+lxml==4.6.5
 MacFSEvents==0.7
 Mako==1.0.6
 MarkupSafe==1.0