diff --git a/pyproject.toml b/pyproject.toml
index 4ef8683..ff8cb7a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ keywords = []
 license = { file = 'license.md' }
 name = 'ofsp'
 readme = 'readme.md'
-requires-python = '>=3.9'
+requires-python = '>=3.10'
 version = '0.0.0'
 
 [project.scripts]