diff --git a/apps/profile/tests.py b/apps/profile/tests.py
index d1dd942d4..cfcf5610f 100644
--- a/apps/profile/tests.py
+++ b/apps/profile/tests.py
@@ -1,7 +1,7 @@
 from utils import json_functions as json
 from django.test.client import Client
 from django.test import TestCase
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.conf import settings
 from mongoengine.connection import connect, disconnect
 
diff --git a/apps/push/models.py b/apps/push/models.py
index ac495e3bc..e6d77ed66 100644
--- a/apps/push/models.py
+++ b/apps/push/models.py
@@ -30,8 +30,7 @@ class PushSubscriptionManager(models.Manager):
         if lease_seconds is None:
             lease_seconds = getattr(settings, 'PUBSUBHUBBUB_LEASE_SECONDS',
                                    DEFAULT_LEASE_SECONDS)
-
-        feed = Feed.get_by_id(feed.pk)
+        feed = Feed.get_by_id(feed.id)
         subscription, created = self.get_or_create(feed=feed)
         signals.pre_subscribe.send(sender=subscription, created=created)
         subscription.set_expiration(lease_seconds)
diff --git a/apps/push/tests.py b/apps/push/tests.py
index e45ec3b8d..b40648dbc 100644
--- a/apps/push/tests.py
+++ b/apps/push/tests.py
@@ -147,7 +147,7 @@ class PSHBSubscriptionManagerTest(PSHBTestBase, TestCase):
         self.responses.append(MockResponse(500, 'error data'))
         try:
             PushSubscription.objects.subscribe('topic', 'hub', 'callback')
-        except urllib.URLError as e:
+        except urllib.error.URLError as e:
             self.assertEquals(e.reason,
                               'error subscribing to topic on hub:\nerror data')
         else:
diff --git a/apps/reader/managers.py b/apps/reader/managers.py
index e4212d901..c808a4ad7 100644
--- a/apps/reader/managers.py
+++ b/apps/reader/managers.py
@@ -33,4 +33,4 @@ class UserSubscriptionManager(models.Manager):
                 return super(UserSubscriptionManager, self).get(*args, **kwargs)
             else:
                 exc_info = sys.exc_info()
-                raise exc_info[0].with_traceback(exc_info[2])
+                raise exc_info[1]