diff --git a/pyproject.toml b/pyproject.toml
index d491809..a5a9be5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Medical Science Apps.",
     "Topic :: Software Development :: Libraries",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "itk == 5.4.*"
 ]