diff --git a/pyproject.toml b/pyproject.toml
index 88219fe..9dafc0d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
     "rtoml>=0.11.0",
     "humanfriendly>=10.0",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.11"
 authors = [{ name = "JOJ3-dev", email = "joj3@focs.ji.sjtu.edu.cn" }]
 maintainers = []
 description = "JOJ3 json configuration file generator"