diff --git a/.travis.yml b/.travis.yml
index bd84faf..863990a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,6 @@ services:
   - docker
 
 before_install:
-  - sudo apt-get -qq update
-  - sudo apt-get install zookeeper zookeeperd -y
-  - sudo pip install cocaine cocaine-tools
-  - docker pull noxiouz/cocaine
   - docker run -d --net=host noxiouz/cocaine && docker ps
 
 install:
diff --git a/cocaine/detail/baseservice.py b/cocaine/detail/baseservice.py
index beabc50..e11d0be 100644
--- a/cocaine/detail/baseservice.py
+++ b/cocaine/detail/baseservice.py
@@ -22,6 +22,7 @@
 import itertools
 import socket
 import time
+import warnings
 import weakref
 
 import six
@@ -76,6 +77,8 @@ def set_keep_alive(sock, idle=10, interval=5, fails=5):
 
 class BaseService(object):
     def __init__(self, name, endpoints, io_loop=None):
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         # If it's not the main thread
         # and a current IOloop doesn't exist here,
         # IOLoop.instance becomes self._io_loop
diff --git a/cocaine/detail/channel.py b/cocaine/detail/channel.py
index db153b5..3885f1d 100644
--- a/cocaine/detail/channel.py
+++ b/cocaine/detail/channel.py
@@ -20,6 +20,7 @@
 
 import datetime
 import logging
+import warnings
 
 import six
 
@@ -123,6 +124,8 @@ def __init__(self, rx_tree, session_id, header_table=None, io_loop=None, service
         if header_table is None:
             header_table = CocaineHeaders()
 
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         # If it's not the main thread
         # and a current IOloop doesn't exist here,
         # IOLoop.instance becomes self._io_loop
diff --git a/cocaine/detail/iotimer.py b/cocaine/detail/iotimer.py
index ab37782..16bd851 100644
--- a/cocaine/detail/iotimer.py
+++ b/cocaine/detail/iotimer.py
@@ -18,10 +18,14 @@
 #    You should have received a copy of the GNU Lesser General Public License
 #    along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
+import warnings
 
-from tornado.ioloop import PeriodicCallback
+from tornado.ioloop import IOLoop, PeriodicCallback
 
 
 class Timer(PeriodicCallback):
-    def __init__(self, callback, callback_time, io_loop):
+    def __init__(self, callback, callback_time, io_loop=None):
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
+        io_loop = io_loop or IOLoop.current()
         super(Timer, self).__init__(callback, callback_time * 1000, io_loop)
diff --git a/cocaine/detail/locator.py b/cocaine/detail/locator.py
index 9662c16..a1df79f 100644
--- a/cocaine/detail/locator.py
+++ b/cocaine/detail/locator.py
@@ -17,6 +17,7 @@
 #    You should have received a copy of the GNU Lesser General Public License
 #    along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
+import warnings
 
 from .api import API
 from .baseservice import BaseService
@@ -27,6 +28,8 @@
 
 class Locator(BaseService):
     def __init__(self, endpoints=LOCATOR_DEFAULT_ENDPOINTS, io_loop=None):
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         super(Locator, self).__init__(name="locator",
                                       endpoints=endpoints, io_loop=io_loop)
         self.api = API.Locator
diff --git a/cocaine/detail/logger.py b/cocaine/detail/logger.py
index 008f882..cc1ae43 100644
--- a/cocaine/detail/logger.py
+++ b/cocaine/detail/logger.py
@@ -24,6 +24,7 @@
 import json
 import logging
 import threading
+import warnings
 
 import six
 from six.moves import cStringIO as BytesIO
@@ -87,6 +88,8 @@ def __new__(cls, *args, **kwargs):
 
     @thread_once
     def __init__(self, endpoints=LOCATOR_DEFAULT_ENDPOINTS, io_loop=None):
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         self.io_loop = io_loop or IOLoop.current()
         self.endpoints = endpoints
         self._lock = Lock()
@@ -268,7 +271,8 @@ def __del__(self):
 
 @coroutine
 def resolve_logging(endpoints, name="logging", io_loop=None):
-    io_loop = io_loop or IOLoop.current()
+    if io_loop:
+        warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
 
     for host, port in endpoints:
         buff = msgpack_unpacker()
@@ -303,7 +307,7 @@ def emit(self, record):
         lvl = record.levelno
         extra = getattr(record, "extra", {})
         if lvl >= logging.ERROR:
-            # to avoid message formating
+            # to avoid message formatting
             if self._logger.enable_for(ERROR_LEVEL):
                 self._logger.error(self.format(record), extra=extra)
         elif lvl >= logging.WARNING:
diff --git a/cocaine/detail/service.py b/cocaine/detail/service.py
index 1c53c53..018a2b5 100644
--- a/cocaine/detail/service.py
+++ b/cocaine/detail/service.py
@@ -18,6 +18,7 @@
 #    You should have received a copy of the GNU Lesser General Public License
 #    along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
+import warnings
 
 from .baseservice import BaseService
 from .defaults import Defaults
@@ -34,6 +35,8 @@
 class Service(BaseService):
     def __init__(self, name, endpoints=LOCATOR_DEFAULT_ENDPOINT,
                  seed=None, version=0, locator=None, io_loop=None, timeout=0):
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         super(Service, self).__init__(name=name, endpoints=LOCATOR_DEFAULT_ENDPOINT, io_loop=io_loop)
         self.locator_endpoints = endpoints
         self.locator = locator
diff --git a/cocaine/futures/__init__.py b/cocaine/futures/__init__.py
index cf5ee13..792c6ff 100644
--- a/cocaine/futures/__init__.py
+++ b/cocaine/futures/__init__.py
@@ -20,6 +20,7 @@
 #
 
 import threading
+import warnings
 
 from tornado.concurrent import Future
 from tornado.ioloop import IOLoop
@@ -31,6 +32,8 @@
 class ConcurrentWorker(object):
     def __init__(self, func, io_loop=None, args=(), kwargs=None):
         self._func = func
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         self._io_loop = io_loop or IOLoop.current()
         self._args = args
         self._kwargs = kwargs or {}
@@ -53,5 +56,5 @@ def execute(self):
 
 def threaded(func):
     def wrapper(*args, **kwargs):
-        return ConcurrentWorker(func, io_loop=None, args=args, kwargs=kwargs).execute()
+        return ConcurrentWorker(func, args=args, kwargs=kwargs).execute()
     return wrapper
diff --git a/cocaine/worker/worker.py b/cocaine/worker/worker.py
index fdcfa05..be8df59 100644
--- a/cocaine/worker/worker.py
+++ b/cocaine/worker/worker.py
@@ -20,6 +20,7 @@
 #
 import logging
 import socket
+import warnings
 
 import six
 
@@ -71,7 +72,10 @@ def token(self):
 
 
 class TicketVendingMachineTokenManager(TokenManager):
-    def __init__(self, name, ticket, interval, loop):
+    def __init__(self, name, ticket, interval, loop=None):
+        if loop:
+            warnings.warn('loop argument is deprecated.', DeprecationWarning)
+        loop = loop or IOLoop.current()
         self._name = name
         self._ticket = ticket
         self._service = Service('tvm')
@@ -100,7 +104,10 @@ def _refresh(self):
             yield now
 
 
-def make_token_manager(name, token, loop):
+def make_token_manager(name, token, loop=None):
+    if loop:
+        warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
+    loop = loop or IOLoop.current()
     if token.ty == 'TVM':
         return TicketVendingMachineTokenManager(name, token.body, 10.0, loop)
     else:
@@ -111,7 +118,6 @@ class BasicWorker(object):
     def __init__(self, disown_timeout=DEFAULT_DISOWN_TIMEOUT,
                  heartbeat_timeout=DEFAULT_HEARTBEAT_TIMEOUT,
                  io_loop=None, app=None, uuid=None, endpoint=None):
-
         if heartbeat_timeout < disown_timeout:
             raise ValueError("heartbeat timeout must be greater than disown")
 
@@ -119,6 +125,8 @@ def __init__(self, disown_timeout=DEFAULT_DISOWN_TIMEOUT,
         self.uuid = uuid or Defaults.uuid
         self.endpoint = endpoint or Defaults.endpoint
 
+        if io_loop:
+            warnings.warn('io_loop argument is deprecated.', DeprecationWarning)
         self.io_loop = io_loop or IOLoop.current()
         self._token_manager = make_token_manager(
             self.appname,
diff --git a/requirements.txt b/requirements.txt
index fb44443..1aa052a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,9 @@
-msgpack-python
-six <= 1.10
-tornado>=4.2
+
+msgpack
+six >= 1.9,<= 1.10
+tornado >=4.2,<5
+
+
+
+
+
diff --git a/tests/runtime.py b/tests/runtime.py
index 6c29c8d..923328e 100644
--- a/tests/runtime.py
+++ b/tests/runtime.py
@@ -42,9 +42,8 @@
 class RuntimeMock(tcpserver.TCPServer):
     _msgpack_string_encoding = None if sys.version_info[0] == 2 else 'utf8'
 
-    def __init__(self, unixsocket, io_loop=None):
-        super(RuntimeMock, self).__init__(io_loop=io_loop or ioloop.IOLoop.current())
-        self.io_loop = io_loop or ioloop.IOLoop.current()
+    def __init__(self, unixsocket):
+        super(RuntimeMock, self).__init__()
         self.actions = list()
         self.counter = 1
         self.endpoint = unixsocket
diff --git a/tox.ini b/tox.ini
index fbef17d..4d6a026 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,10 +1,10 @@
 [tox]
 envlist = flake8,
-		  py27,
-		  py34,
-		  py35,
-		  py36
-		  pypy
+          py27,
+          py34,
+          py35,
+          py36,
+          pypy
 skip_missing_interpreters = True
 
 
@@ -21,16 +21,13 @@ exclude = .tox,.git,build/,examples/,tests/,*.egg/,docs/
 
 
 [testenv]
-# Install eggs
-install_command = pip install --egg {opts} {packages}
 deps        = -rtests/requirements.txt
 commands    = python setup.py nosetests --cover-min-percentage=0
 
 
 [testenv:flake8]
-install_command = pip install {opts} {packages}
 deps        = flake8
-			flake8-import-order
-			flake8-blind-except
-			pep8-naming
+              flake8-import-order
+              flake8-blind-except
+              pep8-naming
 commands    = flake8 {toxinidir}