diff --git a/.travis.yml b/.travis.yml
index 8e1e41c..72c2f56 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,10 @@
 language: python
 
-before_install: pip install -r requirements.txt
+python:
+  - "2.7"
+  - "3.4"
+  - "3.5"
+  - "3.6"
+  - "3.7-dev"
 
-script: nosetests
\ No newline at end of file
+script: python setup.py test
diff --git a/packtrack/__init__.py b/packtrack/__init__.py
index 80d4852..969f14b 100755
--- a/packtrack/__init__.py
+++ b/packtrack/__init__.py
@@ -1,6 +1,6 @@
-from correios import EncomendaRepository
-from royal import RoyalMail
-from dhl_gm import DhlGmTracker
+from .correios import EncomendaRepository
+from .royal import RoyalMail
+from .dhl_gm import DhlGmTracker
 
 
 class Correios(object):
diff --git a/packtrack/bs.py b/packtrack/bs.py
new file mode 100644
index 0000000..59f2676
--- /dev/null
+++ b/packtrack/bs.py
@@ -0,0 +1,9 @@
+import functools
+
+try:
+    from bs4 import BeautifulSoup
+    BeautifulSoup = functools.partial(BeautifulSoup, features="lxml")
+except ImportError:
+    from BeautifulSoup import BeautifulSoup
+
+BeautifulSoup = BeautifulSoup
diff --git a/packtrack/correios.py b/packtrack/correios.py
index 4514751..72a4f3c 100644
--- a/packtrack/correios.py
+++ b/packtrack/correios.py
@@ -15,7 +15,7 @@ def get(self, numero, auth=None):
         return func(numero, **kwargs)
 
     def _init_scraper(self, backend):
-        from scraping import CorreiosWebsiteScraper, CorreiosRastroService
+        from .scraping import CorreiosWebsiteScraper, CorreiosRastroService
         if backend is None:
             backend = 'www2'
 
@@ -37,7 +37,7 @@ def adicionar_status(self, status):
         d = datetime
         self.status.append(status)
         t_format = self.validar_data(status.data)
-        self.status.sort(lambda x, y: 1 if d.strptime(x.data, t_format) > d.strptime(y.data, t_format) else -1)
+        self.status.sort(key=lambda x: d.strptime(x.data, t_format))
 
     def validar_data(self, data):
         if re.match('^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$', data):
diff --git a/packtrack/royal.py b/packtrack/royal.py
index 38d2617..5032854 100644
--- a/packtrack/royal.py
+++ b/packtrack/royal.py
@@ -1,5 +1,6 @@
 import requests
-from bs4 import BeautifulSoup
+
+from .bs import BeautifulSoup
 
 
 class RoyalMail(object):
diff --git a/packtrack/scraping.py b/packtrack/scraping.py
index fc0c3b0..61f6f5d 100755
--- a/packtrack/scraping.py
+++ b/packtrack/scraping.py
@@ -1,15 +1,21 @@
 import os
 import re
-from HTMLParser import HTMLParser
 
-from BeautifulSoup import BeautifulSoup
+try:
+    from html.parser import HTMLParser
+    from html import unescape
+except ImportError:
+    from HTMLParser import HTMLParser
+    unescape = None
+
 import requests
 from requests.exceptions import RequestException
 from zeep import Client as Zeep
 from zeep.cache import InMemoryCache
 from zeep.transports import Transport
 
-from correios import Encomenda, Status
+from .bs import BeautifulSoup
+from .correios import Encomenda, Status
 
 
 class CorreiosWebsiteScraper(object):
@@ -65,6 +71,8 @@ def _text(self, value):
     def _get_all_status_from_html(self, html):
         status = []
         html_parser = HTMLParser()
+        _unescape = unescape or html_parser.unescape
+
         if "<table" not in html:
             return status
         html_info = re.search('.*(<table.*</table>).*', html, re.S)
@@ -80,15 +88,22 @@ def _get_all_status_from_html(self, html):
             except AttributeError:
                 continue
             for td in tds:
-                content = td.renderContents().replace('\r', ' ') \
-                    .split('<br />')
-                class_ = td['class']
+                content = td.renderContents()
+                content = content.replace(b'\r', b' ')
+                content = content.replace(b'\xa0', b' ')
+                content = content.replace(b'<br />', b'<br/>')
+                content = content.split(b'<br/>')
+
+                # bs4 return a list, bs3 return a string, join normalize
+                # this behaviour
+                class_ = "".join(td['class'])
+
                 if class_ == 'sroDtEvent':
                     data = '%s %s' % (content[0].strip(), content[1].strip())
                     local = '/'.join(self._text(content[2]).rsplit(' / ', 1)).upper()
                 elif class_ == 'sroLbEvent':
-                    situacao = html_parser.unescape(self._text(content[0]))
-                    detalhes = html_parser.unescape(self._text(content[1]))
+                    situacao = _unescape(self._text(content[0]))
+                    detalhes = _unescape(self._text(content[1]))
                     if detalhes:
                         detalhes = u'%s %s' % (situacao, detalhes)
                     status.append(Status(data=data, local=local,
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 5e0d12c..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-BeautifulSoup==3.2.1
-argparse==1.2.1
-beautifulsoup4==4.3.2
-lxml==2.3.5
-mockito==0.5.1
-requests==2.18.1
-wsgiref==0.1.2
-zeep==1.6.0
diff --git a/setup.py b/setup.py
index dfbab09..9e2c60c 100755
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,20 @@
 # coding: UTF-8
 from setuptools import setup
+import sys
+
+install_requires = [
+    'requests >= 0.14.2',
+    'lxml >= 3.0.0',
+    'zeep >= 1.6.0',
+]
+if sys.version_info >= (3, 0):
+    install_requires.append('beautifulsoup4 >= 4.3.2')
+else:
+    install_requires.append('BeautifulSoup >= 3.1.0')
+
+tests_require = [
+]
+
 
 setup(
     name='packtrack',
@@ -12,11 +27,7 @@
     keywords='encomendas track api',
     url='https://github.com/aleborba/packtrack',
     long_description='API Python para obter informacoes de encomendas. Para mais detalhes veja a documentacao no Github: https://github.com/aleborba/packtrack/blob/master/README.textile',
-    install_requires=[
-        'BeautifulSoup >= 3.1.0',
-        'requests >= 0.14.2',
-        'beautifulsoup4 >= 4.3.2',
-        'lxml >= 2.3.5',
-        'zeep >= 1.6.0',
-    ],
+    install_requires=install_requires,
+    test_suite="tests",
+    tests_require=tests_require,
 )
diff --git a/tests/correios_api_test.py b/tests/correios_api_test.py
index 6777ec3..f5b62c4 100644
--- a/tests/correios_api_test.py
+++ b/tests/correios_api_test.py
@@ -1,7 +1,9 @@
 import unittest
 
-from mock import Mock
-from mockito import when
+try:
+    from unittest.mock import Mock
+except ImportError:
+    from mock import Mock
 
 from packtrack import Correios
 
@@ -10,20 +12,20 @@ class CorreiosTest(unittest.TestCase):
 
     def test_should_use_repository_to_get_encomenda(self):
         encomenda_repository_mock = Mock()
-        when(encomenda_repository_mock).get('123', auth=None) \
-            .thenReturn('encomenda123')
+        encomenda_repository_mock.get.return_value = "encomenda123"
 
         Correios._backends[None] = encomenda_repository_mock
 
         assert Correios.track('123') == 'encomenda123'
+        encomenda_repository_mock.get.assert_called_with("123", auth=None)
 
     def test_service_should_receive_auth(self):
         auth = ('mi', 'mimi')
         encomenda_repository_mock = Mock()
-        when(encomenda_repository_mock).get('123', auth=auth) \
-            .thenReturn('encomenda123')
+        encomenda_repository_mock.get.return_value = "encomenda123"
 
         Correios._backends['service'] = encomenda_repository_mock
 
         assert Correios.track(
             '123', backend='service', auth=auth) == 'encomenda123'
+        encomenda_repository_mock.get.assert_called_with("123", auth=auth)
diff --git a/tests/correios_test.py b/tests/correios_test.py
index d24712e..06b8abe 100644
--- a/tests/correios_test.py
+++ b/tests/correios_test.py
@@ -1,7 +1,9 @@
 import unittest
 
-from mock import Mock
-from mockito import *
+try:
+    from unittest.mock import Mock
+except ImportError:
+    from mock import Mock
 
 from packtrack.correios import Encomenda, Status, EncomendaRepository
 
@@ -11,8 +13,8 @@ def test_should_get_encomenda_by_numero(self):
         encomenda_123 = Status(data='2009-01-28 17:49:00')
         
         correios_website_scraper_mock = Mock()
-        when(correios_website_scraper_mock).get_encomenda_info('123', auth=None).thenReturn(encomenda_123)
-        
+        correios_website_scraper_mock.get_encomenda_info.return_value = encomenda_123
+
         repository = EncomendaRepository()
         repository.correios_website_scraper = correios_website_scraper_mock
         encomenda = repository.get('123')
diff --git a/tests/scraping_test.py b/tests/scraping_test.py
index 547c605..7aff6f3 100644
--- a/tests/scraping_test.py
+++ b/tests/scraping_test.py
@@ -2,7 +2,10 @@
 import os
 import unittest
 
-import mock
+try:
+    from unittest import mock
+except ImportError:
+    import mock
 
 from packtrack.scraping import CorreiosWebsiteScraper
 from packtrack.dhl_gm import DhlGmTracker
@@ -17,9 +20,9 @@ def _assert_status(self, status, data, local, situacao, detalhes):
         self.assertEqual(detalhes, status.detalhes)
 
     def test_should_get_data_from_correios_website(self):
-        example_file = open('%s/tests/correios_website/exemplo_rastreamento_correios1.html' % os.getcwd())
-        sample_html = example_file.read()
-        example_file.close()
+        filename = '%s/tests/correios_website/exemplo_rastreamento_correios1.html' % os.getcwd()
+        with open(filename, "rb") as f:
+            sample_html = f.read()
 
         http_client_mock = mock.Mock()
         response_mock = mock.Mock()