diff --git a/djmoney_rates/backends.py b/djmoney_rates/backends.py
index 3e11e17..b317216 100644
--- a/djmoney_rates/backends.py
+++ b/djmoney_rates/backends.py
@@ -6,7 +6,11 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.utils import six
 
-from .compat import urlopen
+try:
+    from urllib2 import urlopen
+except ImportError:
+    from urllib.request import urlopen
+
 from .exceptions import RateBackendError
 from .models import RateSource, Rate
 from .settings import money_rates_settings
diff --git a/djmoney_rates/compat.py b/djmoney_rates/compat.py
deleted file mode 100644
index 1ad8fe0..0000000
--- a/djmoney_rates/compat.py
+++ /dev/null
@@ -1,9 +0,0 @@
-try:
-    from urllib2 import urlopen
-except ImportError:
-    from urllib.request import urlopen
-
-try:
-    from urllib2 import URLError
-except ImportError:
-    from urllib.error import URLError
diff --git a/djmoney_rates/management/commands/update_rates.py b/djmoney_rates/management/commands/update_rates.py
index 47d41b8..c69d58d 100644
--- a/djmoney_rates/management/commands/update_rates.py
+++ b/djmoney_rates/management/commands/update_rates.py
@@ -6,15 +6,17 @@
 
 
 class Command(BaseCommand):
-    args = '<backend_path>'
     help = 'Update rates for configured source'
 
+    def add_arguments(self, parser):
+        parser.add_argument('backend_path')
+
     def handle(self, *args, **options):
-        if args:
+        if 'backend_path' in options and options['backend_path']:
             try:
-                backend_class = import_from_string(args[0], "")
+                backend_class = import_from_string(options['backend_path'], "")
             except ImportError:
-                raise CommandError("Cannot find custom backend %s. Is it correct" % args[0])
+                raise CommandError("Cannot find custom backend %s. Is it correct" % options['backend_path'])
         else:
             backend_class = money_rates_settings.DEFAULT_BACKEND
 
diff --git a/djmoney_rates/settings.py b/djmoney_rates/settings.py
index e046cf9..d3e55f5 100644
--- a/djmoney_rates/settings.py
+++ b/djmoney_rates/settings.py
@@ -16,7 +16,12 @@
 """
 
 from django.conf import settings
-from django.utils import importlib, six
+
+try:
+    from django.utils import importlib, six
+except ImportError:
+    import importlib
+    import six
 
 
 USER_SETTINGS = getattr(settings, 'DJANGO_MONEY_RATES', None)
@@ -105,4 +110,5 @@ def validate_setting(self, attr, val):
         if not val and attr in self.mandatory:
             raise AttributeError("django-money-rates setting: '%s' is mandatory" % attr)
 
+
 money_rates_settings = MoneyRatesSettings(USER_SETTINGS, DEFAULTS, IMPORT_STRINGS, MANDATORY)
diff --git a/tox.ini b/tox.ini
index 831b740..cfbb302 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,7 +27,8 @@ commands =
 commands=python runtests.py
 deps =
     django18: Django==1.8.16
-    -rrequirements/testing.txt
+    virtualenv<14
+    -rrequirements-test.txt
 
 [testenv:flake8]
 deps =