diff --git a/pyproject.toml b/pyproject.toml
index 9fb5907..48658ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Medical Science Apps.",
     "Topic :: Software Development :: Libraries",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "itk-io == 5.4.*",
     "numpy",