diff --git a/pyproject.toml b/pyproject.toml
index 8eef0a7..05a4666 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,6 +2,7 @@
 [project]
 name = "appendfilename"
 version = "2026.03.01.1"
+requires-python = ">=3.10"
 description = "Intelligent appending text to file names, considering file extensions and file tags"
 license = "GPL-3.0-or-later"
 readme = { file = "README.org", content-type = "text/plain" }