diff --git a/Makefile b/Makefile
index 1bd1cbd..c5c07a7 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ test: mypy check
 
 
 mypy:
-	mypy async_timeout tests
+	mypy --config-file setup.cfg async_timeout tests
 
 
 check:
diff --git a/async_timeout/__init__.py b/async_timeout/__init__.py
index 08bdd47..e6e6124 100644
--- a/async_timeout/__init__.py
+++ b/async_timeout/__init__.py
@@ -2,7 +2,7 @@
 import sys
 
 from types import TracebackType
-from typing import Optional, Type
+from typing import Optional, Type, Any
 
 
 __version__ = '3.0.0'
@@ -25,12 +25,12 @@ class timeout:
     loop - asyncio compatible event loop
     """
     def __init__(self, timeout: Optional[float],
-                 *, loop: asyncio.AbstractEventLoop=None) -> None:
+                 *, loop: Optional[asyncio.AbstractEventLoop] = None) -> None:
         self._timeout = timeout
         if loop is None:
             loop = asyncio.get_event_loop()
         self._loop = loop
-        self._task = None  # type: Optional[asyncio.Task]
+        self._task = None  # type: Optional[asyncio.Task[Any]]
         self._cancelled = False
         self._cancel_handler = None  # type: Optional[asyncio.Handle]
         self._cancel_at = None  # type: Optional[float]
@@ -102,7 +102,7 @@ def _cancel_task(self) -> None:
             self._cancelled = True
 
 
-def current_task(loop: asyncio.AbstractEventLoop) -> asyncio.Task:
+def current_task(loop: asyncio.AbstractEventLoop) -> 'asyncio.Task[Any]':
     if PY_37:
         task = asyncio.current_task(loop=loop)  # type: ignore
     else:
diff --git a/setup.cfg b/setup.cfg
index 919fd65..c4fd4f5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,3 +6,16 @@ license_file = LICENSE
 
 [mypy-pytest]
 ignore_missing_imports = true
+
+[mypy]
+python_version = 3.6
+warn_unused_ignores = True
+warn_redundant_casts = True
+warn_no_return = True
+strict_optional = True
+show_traceback = True
+show_column_numbers = True
+no_implicit_optional = True
+disallow_incomplete_defs = True
+disallow_any_generics = True
+ignore_missing_imports = True