diff --git a/pyproject.toml b/pyproject.toml
index 69e325d..ee9ff9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,7 +60,7 @@ all-sql = [
 dev = [
     "pytest>=8.3.2",
     "fastavro>=1.9.5",
-    "xmlschema>=3.3.2",
+    "xmlschema>=4.3.1",
     "xmlunittest>=1.0.1",
     "pylint>=3.2.6",
     "dataclasses_json>=0.6.7",