diff --git a/joj3_config_generator/models/task.py b/joj3_config_generator/models/task.py
index 2b39cad..6a876bc 100644
--- a/joj3_config_generator/models/task.py
+++ b/joj3_config_generator/models/task.py
@@ -1,5 +1,5 @@
 from datetime import datetime, timedelta
-from enum import StrEnum
+from enum import Enum
 from pathlib import Path
 from typing import Any, Dict, List, Type
 
@@ -81,7 +81,7 @@ class Limit(BaseModel):
         raise ValueError("Must be a string")
 
 
-class Parser(StrEnum):
+class Parser(str, Enum):
     CLANG_TIDY = "clangtidy"
     CPPCHECK = "cppcheck"
     CPPLINT = "cpplint"
diff --git a/pyproject.toml b/pyproject.toml
index 9248cca..88219fe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,10 +11,10 @@ dependencies = [
     "loguru>=0.7.2",
     "pydantic>=2.9.2",
     "inquirer>=3.4.0",
-    "rtoml>=0.12.0",
+    "rtoml>=0.11.0",
     "humanfriendly>=10.0",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 authors = [{ name = "JOJ3-dev", email = "joj3@focs.ji.sjtu.edu.cn" }]
 maintainers = []
 description = "JOJ3 json configuration file generator"