diff --git a/pyproject.toml b/pyproject.toml
index ebf1b17..986e86b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ authors = [
 ]
 description = "Helper package for irv-datapkg workflow"
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: MIT License",