diff --git a/.travis.yml b/.travis.yml
index cfecf48..c4db70e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,14 @@
 language: python
-python: 3.4
+dist: precise
+python:
+  - "2.7"
+  - "3.4"
+  - "pypy"
 services:
   - mysql
   - redis-server
-env:
-  - TOXENV=flake8
-  - TOXENV=py27
-  - TOXENV=py33
-  - TOXENV=py34
-  - TOXENV=pypy
 before_install:
-  - pip install tox
+  - pip install tox==1.9.2
 before_script:
   # enable row-based binlog
   - sudo touch /etc/mysql/conf.d/replication.cnf
diff --git a/examples/repl_db/repl.py b/examples/repl_db/repl.py
index 9b9592c..72d3145 100644
--- a/examples/repl_db/repl.py
+++ b/examples/repl_db/repl.py
@@ -75,7 +75,7 @@ def _update_by_pk(name, pk):
         for col in columns:
             try:
                 val = getattr(obj, col)
-            except AttributeError as e:
+            except AttributeError:
                 continue
             setattr(s_obj, col, val)
 
diff --git a/meepo/apps/eventsourcing/event_store.py b/meepo/apps/eventsourcing/event_store.py
index 500630f..790549d 100644
--- a/meepo/apps/eventsourcing/event_store.py
+++ b/meepo/apps/eventsourcing/event_store.py
@@ -121,7 +121,7 @@ class RedisEventStore(EventStore):
     end
     """.split())
 
-    def __init__(self, redis_dsn, namespace=None, ttl=3600*24*3,
+    def __init__(self, redis_dsn, namespace=None, ttl=3600 * 24 * 3,
                  socket_timeout=1, **kwargs):
         super(RedisEventStore, self).__init__()
 
diff --git a/meepo/apps/eventsourcing/prepare_commit.py b/meepo/apps/eventsourcing/prepare_commit.py
index d30954a..fc513b6 100644
--- a/meepo/apps/eventsourcing/prepare_commit.py
+++ b/meepo/apps/eventsourcing/prepare_commit.py
@@ -85,7 +85,7 @@ class RedisPrepareCommit(PrepareCommit):
     :param socket_timeout: redis socket timeout
     :param kwargs: kwargs to be passed to redis instance init func.
     """
-    def __init__(self, redis_dsn, strict=False, namespace=None, ttl=3600*24,
+    def __init__(self, redis_dsn, strict=False, namespace=None, ttl=3600 * 24,
                  socket_timeout=1, **kwargs):
         super(RedisPrepareCommit, self).__init__()
 
diff --git a/meepo/apps/eventsourcing/sub.py b/meepo/apps/eventsourcing/sub.py
index 34e9350..5010699 100644
--- a/meepo/apps/eventsourcing/sub.py
+++ b/meepo/apps/eventsourcing/sub.py
@@ -15,7 +15,7 @@
 
 
 def redis_es_sub(session, tables, redis_dsn, strict=False,
-                 namespace=None, ttl=3600*24*3, socket_timeout=1):
+                 namespace=None, ttl=3600 * 24 * 3, socket_timeout=1):
     """Redis EventSourcing sub.
 
     This sub should be used together with sqlalchemy_es_pub, it will
@@ -52,7 +52,7 @@ def _es_event_sub(pk, event):
             logger.error("event sourcing failed: %s" % pk)
 
     events = ("%s_%s" % (tb, action) for tb, action in
-              itertools.product(*[tables, ["write", "update",  "delete"]]))
+              itertools.product(*[tables, ["write", "update", "delete"]]))
     for event in events:
         sub_func = functools.partial(_es_event_sub, event=event)
         signal(event).connect(sub_func, weak=False)
diff --git a/meepo/signals.py b/meepo/signals.py
index 1b0b9cd..9c8a402 100644
--- a/meepo/signals.py
+++ b/meepo/signals.py
@@ -21,6 +21,8 @@ def hashable_identity(obj):
 
     import blinker.base
     blinker.base.hashable_identity = hashable_identity
+
+
 _monkey_patch_hashable_func()
 
 
diff --git a/meepo/sub/statsd.py b/meepo/sub/statsd.py
index 5c3065f..bc64d82 100644
--- a/meepo/sub/statsd.py
+++ b/meepo/sub/statsd.py
@@ -43,7 +43,7 @@ def statsd_sub(statsd_dsn, tables, prefix="meepo.stats", rate=1):
               itertools.product(*[tables, ["write", "update", "delete"]]))
     for event in events:
         signal(event).connect(
-            lambda _, e=event: c.incr(_key(*e.rsplit('_', 1)),  rate=rate),
+            lambda _, e=event: c.incr(_key(*e.rsplit('_', 1)), rate=rate),
             weak=False
         )
 
diff --git a/meepo/utils.py b/meepo/utils.py
index 1a6c5c1..dc08631 100644
--- a/meepo/utils.py
+++ b/meepo/utils.py
@@ -51,6 +51,8 @@ def cast_bytes(s, encoding='utf8', errors='strict'):
         return s.encode(encoding, errors)
     else:
         raise TypeError("Expected unicode or bytes, got %r" % s)
+
+
 b = cast_bytes
 
 
@@ -62,6 +64,8 @@ def cast_str(s, encoding='utf8', errors='strict'):
         return s
     else:
         raise TypeError("Expected unicode or bytes, got %r" % s)
+
+
 s = cast_str
 
 
@@ -71,4 +75,6 @@ def cast_datetime(ts, fmt=None):
     if fmt:
         return dt.strftime(fmt)
     return dt
+
+
 d = cast_datetime
diff --git a/setup.py b/setup.py
index 80ce894..9ab041d 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 install_requires = [
     "SQLAlchemy>=0.9.0,<1.1.0",
     "blinker>=1.3,<2.0",
-    "mysql-replication>=0.5,<0.6.0",
+    "mysql-replication>=0.5",
     "pyketama>=0.2.0",
     "pyzmq>=14.3.1,<15.0.0",
     "redis>=2.10.3,<2.11.0",
diff --git a/tests/test_eventsourcing/test_sqlalchemy_es_pub.py b/tests/test_eventsourcing/test_sqlalchemy_es_pub.py
index 876d61b..22440cd 100644
--- a/tests/test_eventsourcing/test_sqlalchemy_es_pub.py
+++ b/tests/test_eventsourcing/test_sqlalchemy_es_pub.py
@@ -199,7 +199,7 @@ def test_sa_mixed_write_update_delete_and_multi_flushes(session, model_cls):
     5. commit
     """
     t_b, t_c = session.query(model_cls). \
-        filter(model_cls.data.in_(('b',  'c'))).all()
+        filter(model_cls.data.in_(('b', 'c'))).all()
     t_e = model_cls(data='e')
     session.add(t_e)
     t_b.data = "x"
diff --git a/tests/test_mysql_pub.py b/tests/test_mysql_pub.py
index d80ca42..14f735b 100644
--- a/tests/test_mysql_pub.py
+++ b/tests/test_mysql_pub.py
@@ -31,7 +31,7 @@ def test_sg(sg_list):
     signal("test_delete_raw").connect(test_sg(t_raw_deletes), weak=False)
 
     # connect mysql binlog pos signal
-    signal("mysql_binlog_pos").connect(test_sg(t_binlogs),  weak=False)
+    signal("mysql_binlog_pos").connect(test_sg(t_binlogs), weak=False)
 
 
 @pytest.fixture(scope="module")
diff --git a/tests/test_sqlalchemy_pub.py b/tests/test_sqlalchemy_pub.py
index f4b5be0..f3ce97f 100644
--- a/tests/test_sqlalchemy_pub.py
+++ b/tests/test_sqlalchemy_pub.py
@@ -140,7 +140,7 @@ def test_sa_mixed_write_update_delete_and_multi_flushes(session, model_cls):
     5. commit
     """
     t_b, t_c = session.query(model_cls).\
-        filter(model_cls.data.in_(('b',  'c'))).all()
+        filter(model_cls.data.in_(('b', 'c'))).all()
     t_e = model_cls(data='e')
     session.add(t_e)
     t_b.data = "x"
diff --git a/tox.ini b/tox.ini
index e2b5725..5f5d628 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,24 +1,15 @@
-[tox]
-envlist = flake8, py27, py33, py34, pypy
-
 [testenv]
-basepython =
-    py27: python2.7
-    py33: python3.3
-    py34: python3.4
-    pypy: pypy
 deps =
     mysql-replication>=0.5
-    pytest>=2.6.4
+    pytest>=2.6.4,<3.0.0
     redis>=2.10.3
     teamcity-messages>=1.8
+    PyMySQL>0.7.0,<0.8.0
+    flake8>=2.2.5
 commands =
     python --version
+    flake8 .
     py.test {posargs}
 
-[testenv:flake8]
-basepython = python
-deps =
-    flake8 >=2.2.5
-commands =
-    flake8 .
+[flake8]
+ignore = E402, E731
\ No newline at end of file