diff --git a/pyproject.toml b/pyproject.toml
index 0760395..46d18ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ httpx = "0.18.1"
 idna = "3.1"
 ipywidgets = "7.6.3"
 joblib = "1.0.1"
-lxml = "4.6.3"
+lxml = "4.9.1"
 more-itertools = "8.7.0"
 music21 = "7.1.0"
 numpy = "^1.20.2"