diff --git a/pyproject.toml b/pyproject.toml
index 0fa6840..500d65e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ classifiers = [
     "Programming Language :: Python :: 3.13"
 ]
 dependencies = [
-    "lxml ~= 4.9.2"
+    "lxml ~= 5.3.0"
 ]
 keywords = [
     'waveform',