diff --git a/aioslacker/__init__.py b/aioslacker/__init__.py
index 4cca4fa..e145d8d 100644
--- a/aioslacker/__init__.py
+++ b/aioslacker/__init__.py
@@ -2,6 +2,7 @@
 from urllib.parse import urlencode
 
 import aiohttp
+import async_timeout
 import requests
 import slacker
 
@@ -79,7 +80,7 @@ def __request(self, method, api, **kwargs):
         _response = None
 
         try:
-            with aiohttp.Timeout(self.timeout, loop=self.loop):
+            with async_timeout.timeout(self.timeout, loop=self.loop):
                 _response = yield from _request
 
             _response.raise_for_status()
@@ -285,7 +286,7 @@ def post(self, data):
         _response = None
 
         try:
-            with aiohttp.Timeout(self.timeout, loop=self.loop):
+            with async_timeout.timeout(self.timeout, loop=self.loop):
                 _response = yield from _request
 
             _response.raise_for_status()
diff --git a/setup.py b/setup.py
index 0fb109b..8e3734c 100644
--- a/setup.py
+++ b/setup.py
@@ -30,6 +30,7 @@ def read(*parts):
     long_description=read('README.rst'),
     install_requires=[
         'aiohttp>=1.3.0',
+        'async_timeout>=3.0.0',
         'slacker<=0.9.42',
     ],
     packages=['aioslacker'],