diff --git a/tox.ini b/tox.ini
index a5802a646..22b1de742 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ deps =
     pytest
     pytest-randomly
     -rrequirements.txt
-    !nolxml: lxml==4.6.1
+    !nolxml: lxml==4.6.4
 extras =
     ufo
     woff