diff --git a/aioclock/app.py b/aioclock/app.py
index 0422c23..3ddd218 100644
--- a/aioclock/app.py
+++ b/aioclock/app.py
@@ -1,6 +1,12 @@
 import asyncio
+import sys
 from functools import wraps
-from typing import Any, Callable
+from typing import Any, Awaitable, Callable, TypeVar
+
+if sys.version_info < (3, 10):
+    from typing_extensions import ParamSpec
+else:
+    from typing import ParamSpec
 
 from fast_depends import inject
 
@@ -10,6 +16,9 @@
 from aioclock.types import Triggers
 from aioclock.utils import flatten_chain
 
+T = TypeVar("T")
+P = ParamSpec("P")
+
 
 class AioClock:
     """
@@ -117,9 +126,9 @@ async def main():
         ```
         """
 
-        def decorator(func: Callable[..., Any]) -> Callable[..., Any]:
+        def decorator(func: Callable[P, Awaitable[T]]) -> Callable[P, Awaitable[T]]:
             @wraps(func)
-            async def wrapper(*args, **kwargs) -> Any:
+            async def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
                 return await func(*args, **kwargs)
 
             self._app_tasks.append(
diff --git a/aioclock/group.py b/aioclock/group.py
index f94a0ea..a59f74d 100644
--- a/aioclock/group.py
+++ b/aioclock/group.py
@@ -1,6 +1,12 @@
 import asyncio
+import sys
 from functools import wraps
-from typing import Any, Callable, Union
+from typing import Awaitable, Callable, TypeVar, Union
+
+if sys.version_info < (3, 10):
+    from typing_extensions import ParamSpec
+else:
+    from typing import ParamSpec
 
 from fast_depends import inject
 
@@ -8,6 +14,9 @@
 from aioclock.task import Task
 from aioclock.triggers import BaseTrigger
 
+T = TypeVar("T")
+P = ParamSpec("P")
+
 
 class Group:
     def __init__(self, *, tasks: Union[list[Task], None] = None):
@@ -50,9 +59,9 @@ async def send_email():
         ```
         """
 
-        def decorator(func: Callable[..., Any]) -> Callable[..., Any]:
+        def decorator(func: Callable[P, Awaitable[T]]) -> Callable[P, Awaitable[T]]:
             @wraps(func)
-            async def wrapper(*args, **kwargs) -> Any:
+            async def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
                 return await func(*args, **kwargs)
 
             self._tasks.append(
diff --git a/aioclock/task.py b/aioclock/task.py
index b437caf..284f01e 100644
--- a/aioclock/task.py
+++ b/aioclock/task.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import Any, Callable
+from typing import Any, Awaitable, Callable
 
 from aioclock.logger import logger
 from aioclock.triggers import BaseTrigger
@@ -12,7 +12,7 @@ class Task:
     This is internally used, when you decorate your function with `aioclock.task`.
     """
 
-    func: Callable[..., Any]
+    func: Callable[..., Awaitable[Any]]
     """Decorated function that will be run by AioClock."""
 
     trigger: BaseTrigger