diff --git a/scrapy/item.py b/scrapy/item.py
index ff1c7363d..9998010b2 100644
--- a/scrapy/item.py
+++ b/scrapy/item.py
@@ -5,7 +5,8 @@ See documentation in docs/topics/item.rst
 """
 
 from pprint import pformat
-from UserDict import DictMixin
+from collections import MutableMapping
+from abc import ABCMeta
 import six
 
 from scrapy.utils.trackref import object_ref
@@ -20,7 +21,7 @@ class Field(dict):
     """Container of field metadata"""
 
 
-class ItemMeta(type):
+class ItemMeta(ABCMeta):
 
     def __new__(mcs, class_name, bases, attrs):
         fields = {}
@@ -37,7 +38,7 @@ class ItemMeta(type):
         return cls
 
 
-class DictItem(DictMixin, BaseItem):
+class DictItem(MutableMapping, BaseItem):
 
     fields = {}
 
@@ -71,6 +72,14 @@ class DictItem(DictMixin, BaseItem):
                 (name, value))
         super(DictItem, self).__setattr__(name, value)
 
+    def __len__(self):
+        return len(self._values)
+
+    def __iter__(self):
+        return iter(self._values)
+
+    __hash__ = BaseItem.__hash__
+
     def keys(self):
         return self._values.keys()
 
@@ -81,6 +90,6 @@ class DictItem(DictMixin, BaseItem):
         return self.__class__(self)
 
 
+@six.add_metaclass(ItemMeta)
 class Item(DictItem):
-
-    __metaclass__ = ItemMeta
+    pass
diff --git a/scrapy/tests/test_item.py b/scrapy/tests/test_item.py
index 2a24fddca..5de77d22e 100644
--- a/scrapy/tests/test_item.py
+++ b/scrapy/tests/test_item.py
@@ -1,6 +1,7 @@
 import unittest
 
 from scrapy.item import Item, Field
+import six
 
 
 class ItemTest(unittest.TestCase):
@@ -52,8 +53,13 @@ class ItemTest(unittest.TestCase):
         i['name'] = u'John Doe'
         i['number'] = 123
         itemrepr = repr(i)
-        self.assertEqual(itemrepr,
-                         "{'name': u'John Doe', 'number': 123}")
+
+        if six.PY2:
+            self.assertEqual(itemrepr,
+                             "{'name': u'John Doe', 'number': 123}")
+        else:
+            self.assertEqual(itemrepr,
+                             "{'name': 'John Doe', 'number': 123}")
 
         i2 = eval(itemrepr)
         self.assertEqual(i2['name'], 'John Doe')
@@ -106,13 +112,13 @@ class ItemTest(unittest.TestCase):
 
         i = TestItem()
         i['name'] = u'John'
-        self.assertEqual(i.keys(), ['name'])
-        self.assertEqual(i.values(), ['John'])
+        self.assertEqual(list(i.keys()), ['name'])
+        self.assertEqual(list(i.values()), ['John'])
 
         i['keys'] = u'Keys'
         i['values'] = u'Values'
-        self.assertSortedEqual(i.keys(), ['keys', 'values', 'name'])
-        self.assertSortedEqual(i.values(), [u'Keys', u'Values', u'John'])
+        self.assertSortedEqual(list(i.keys()), ['keys', 'values', 'name'])
+        self.assertSortedEqual(list(i.values()), [u'Keys', u'Values', u'John'])
 
     def test_metaclass_inheritance(self):
         class BaseItem(Item):
@@ -125,8 +131,8 @@ class ItemTest(unittest.TestCase):
 
         i = TestItem()
         i['keys'] = 3
-        self.assertEqual(i.keys(), ['keys'])
-        self.assertEqual(i.values(), [3])
+        self.assertEqual(list(i.keys()), ['keys'])
+        self.assertEqual(list(i.values()), [3])
 
     def test_to_dict(self):
         class TestItem(Item):
diff --git a/tox.ini b/tox.ini
index 2bd97321e..1474cce39 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,8 +5,6 @@
 
 [tox]
 envlist = py27, pypy, precise, trunk, py33, docs
-indexserver =
-    HPK = https://devpi.net/hpk/dev/
 
 [testenv]
 deps =
@@ -51,9 +49,13 @@ deps =
     w3lib>=1.5
     # tests requirements
     mock
-    :HPK:pytest>2.5.2
+    pytest>=2.6.0
     pytest-twisted
 
+[testenv:py34]
+basepython = python3.4
+deps = {[testenv:py33]deps}
+
 [testenv:windows]
 commands =
     bin/runtests.bat []