diff --git a/stubs/python-crontab/METADATA.toml b/stubs/python-crontab/METADATA.toml
index 5952f2b17..4a8e90c0c 100644
--- a/stubs/python-crontab/METADATA.toml
+++ b/stubs/python-crontab/METADATA.toml
@@ -1 +1 @@
-version = "2.7.*"
+version = "3.0.*"
diff --git a/stubs/python-crontab/crontab.pyi b/stubs/python-crontab/crontab.pyi
index 7dbeb53eb..edf4ebf30 100644
--- a/stubs/python-crontab/crontab.pyi
+++ b/stubs/python-crontab/crontab.pyi
@@ -1,13 +1,13 @@
 import re
 import subprocess
-from _typeshed import Incomplete, Unused
+from _typeshed import Incomplete
 from builtins import range as _range
 from collections import OrderedDict
 from collections.abc import Callable, Generator, Iterable, Iterator
 from datetime import datetime
 from logging import Logger
 from types import TracebackType
-from typing import Any
+from typing import Any, overload
 from typing_extensions import Self, SupportsIndex, TypeAlias
 
 from cronlog import CronLog
@@ -32,7 +32,18 @@ CRON_COMMAND: str
 SHELL: str
 current_user: Callable[[], str | None]
 
-def open_pipe(cmd: str, *args: str, **flags: str) -> subprocess.Popen[Any]: ...
+class Process:
+    env: subprocess._ENV | None
+    args: tuple[str, ...]
+    has_run: bool
+    stdout: str | None
+    stderr: str | None
+    returncode: int | None
+    # `posix` and `env` are known special kwargs:
+    def __init__(self, cmd: str, *args: str, posix: bool = ..., env: subprocess._ENV | None = None, **flags: object) -> None: ...
+    def run(self) -> Self: ...
+    def __int__(self) -> int: ...  # technically, it can return `None` before `run` is called
+    def __eq__(self, other: object) -> bool: ...
 
 class CronTab:
     lines: list[str | CronItem] | None
@@ -69,8 +80,7 @@ class CronTab:
     # Usually `kwargs` are just `now: datetime | None`, but technically this can
     # work for `CronItem` subclasses, which might define other kwargs.
     def run_pending(self, **kwargs: Any) -> Iterator[str]: ...
-    # There are two known kwargs and others are unused:
-    def run_scheduler(self, timeout: int = ..., *, warp: object = ..., cadence: int = ..., **kwargs: Unused) -> Iterator[str]: ...
+    def run_scheduler(self, timeout: int = -1, cadence: int = 60, warp: bool = False) -> Iterator[str]: ...
     def render(self, errors: bool = ..., specials: bool | None = ...) -> str: ...
     def new(
         self,
@@ -132,6 +142,19 @@ class CronItem:
     def frequency_per_year(self, year: int | None = ...) -> int: ...
     def frequency_per_day(self) -> int: ...
     def frequency_per_hour(self) -> int: ...
+    def frequency_at_year(self, year: int | None = None) -> int: ...
+    @overload
+    def frequency_at_month(self, year: int, month: int) -> int: ...
+    @overload
+    def frequency_at_month(self, year: None = None, month: None = None) -> int: ...
+    @overload
+    def frequency_at_day(self, year: int, month: int, day: int) -> int: ...
+    @overload
+    def frequency_at_day(self, year: None = None, month: None = None, day: None = None) -> int: ...
+    @overload
+    def frequency_at_hour(self, year: int, month: int, day: int, hour: int) -> int: ...
+    @overload
+    def frequency_at_hour(self, year: None = None, month: None = None, day: None = None, hour: None = None) -> int: ...
     def run_pending(self, now: datetime | None = ...) -> int | str: ...
     def run(self) -> str: ...
     # TODO: use types from `croniter` module here:
@@ -185,6 +208,19 @@ class CronSlices(list[CronSlice]):
     def frequency_per_year(self, year: int | None = ...) -> int: ...
     def frequency_per_day(self) -> int: ...
     def frequency_per_hour(self) -> int: ...
+    def frequency_at_year(self, year: int | None = None) -> int: ...
+    @overload
+    def frequency_at_month(self, year: int, month: int) -> int: ...
+    @overload
+    def frequency_at_month(self, year: None = None, month: None = None) -> int: ...
+    @overload
+    def frequency_at_day(self, year: int, month: int, day: int) -> int: ...
+    @overload
+    def frequency_at_day(self, year: None = None, month: None = None, day: None = None) -> int: ...
+    @overload
+    def frequency_at_hour(self, year: int, month: int, day: int, hour: int) -> int: ...
+    @overload
+    def frequency_at_hour(self, year: None = None, month: None = None, day: None = None, hour: None = None) -> int: ...
     def __eq__(self, arg: object) -> bool: ...
 
 class SundayError(KeyError): ...
@@ -209,7 +245,7 @@ class CronSlice:
     def __init__(self, info: int | dict[str, Any], value: str | None = ...) -> None: ...
     def __hash__(self) -> int: ...
     def parse(self, value: str | None) -> None: ...
-    def render(self, resolve: bool = ..., specials: bool = ...) -> str: ...
+    def render(self, resolve: bool = False) -> str: ...
     def __eq__(self, arg: object) -> bool: ...
     def every(self, n_value: int, also: bool = ...) -> _Part: ...
     # The only known kwarg, others are unused,