diff --git a/libmango/py/requirements.txt b/libmango/py/requirements.txt
index d380089..0f702c0 100644
--- a/libmango/py/requirements.txt
+++ b/libmango/py/requirements.txt
@@ -1,4 +1,4 @@
 ply==3.10
-lxml==3.8.0
+lxml==4.9.1
 PyYAML==3.12
 pyzmq==17.0.0b1