diff --git a/stubs/python-crontab/METADATA.toml b/stubs/python-crontab/METADATA.toml
index 2accac2d5..dcdabaed0 100644
--- a/stubs/python-crontab/METADATA.toml
+++ b/stubs/python-crontab/METADATA.toml
@@ -1,2 +1,2 @@
-version = "3.0.*"
+version = "3.1.*"
 upstream_repository = "https://gitlab.com/doctormo/python-crontab"
diff --git a/stubs/python-crontab/crontab.pyi b/stubs/python-crontab/crontab.pyi
index 60cb20e41..63b64d008 100644
--- a/stubs/python-crontab/crontab.pyi
+++ b/stubs/python-crontab/crontab.pyi
@@ -259,6 +259,7 @@ class CronSlice:
     def __iter__(self) -> Iterator[int]: ...
     def __len__(self) -> int: ...
     def parse_value(self, val: str, sunday: int | None = ...) -> int | CronValue: ...
+    def test_value(self, value: str, sunday: int | None = None) -> str: ...
 
 def get_cronvalue(value: int, enums: list[str]) -> int | CronValue: ...