diff --git a/db_mutex/db_mutex.py b/db_mutex/db_mutex.py
index c6e0b9a..28e44e3 100644
--- a/db_mutex/db_mutex.py
+++ b/db_mutex/db_mutex.py
@@ -1,9 +1,10 @@
-from datetime import datetime, timedelta
+from datetime import timedelta
 import functools
 import logging
 
 from django.conf import settings
 from django.db import transaction, IntegrityError
+from django.utils import timezone
 
 from .exceptions import DBMutexError, DBMutexTimeoutError
 from .models import DBMutex
@@ -83,7 +84,7 @@ def delete_expired_locks(self):
         """
         ttl_seconds = self.get_mutex_ttl_seconds()
         if ttl_seconds is not None:
-            DBMutex.objects.filter(creation_time__lte=datetime.utcnow() - timedelta(seconds=ttl_seconds)).delete()
+            DBMutex.objects.filter(creation_time__lte=timezone.now() - timedelta(seconds=ttl_seconds)).delete()
 
     def __call__(self, func):
         return self.decorate_callable(func)
diff --git a/db_mutex/models.py b/db_mutex/models.py
index df8c398..100fd89 100644
--- a/db_mutex/models.py
+++ b/db_mutex/models.py
@@ -13,3 +13,6 @@ class DBMutex(models.Model):
     """
     lock_id = models.CharField(max_length=256, unique=True)
     creation_time = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        app_label = 'db_mutex'
diff --git a/db_mutex/version.py b/db_mutex/version.py
index 020ed73..d93b5b2 100644
--- a/db_mutex/version.py
+++ b/db_mutex/version.py
@@ -1 +1 @@
-__version__ = '0.2.2'
+__version__ = '0.2.3'
diff --git a/docs/installation.rst b/docs/installation.rst
index 1e36039..4a9be83 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -1,10 +1,17 @@
 Installation
 ============
 
-To install the latest release, type::
-
+* Install Django-db-mutex with your favorite Python package manager::
+    
+    # Using pip
     pip install django-db-mutex
+    
+    # Or, using pip (from source, in editable form)
+    pip install -e git://github.com/ambitioninc/django-db-mutex.git#egg=django-db-mutex
 
-To install the latest code directly from source, type::
+* Add ``'db_mutex'`` to your ``INSTALLED_APPS`` setting::
 
-    pip install git+git://github.com/ambitioninc/django-db-mutex.git
+    INSTALLED_APPS = (
+        # other apps
+        'db_mutex',
+    )
diff --git a/run_tests.py b/run_tests.py
index b71a452..c008daa 100644
--- a/run_tests.py
+++ b/run_tests.py
@@ -1,6 +1,3 @@
-"""
-Provides the ability to run test on a standalone Django app.
-"""
 import sys
 from optparse import OptionParser
 
@@ -14,7 +11,7 @@
 django.setup()
 
 # Django nose must be imported here since it depends on the settings being configured
-from django_nose import NoseTestSuiteRunner
+from django_nose import NoseTestSuiteRunner  # noqa
 
 
 def run_tests(*test_args, **kwargs):
diff --git a/settings.py b/settings.py
index 1716a07..2df6751 100644
--- a/settings.py
+++ b/settings.py
@@ -49,7 +49,7 @@ def configure_settings():
                 'django_nose',
             ),
             DEBUG=False,
-            CACHES = {
+            CACHES={
                 'default': {
                     'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
                     'LOCATION': 'unique-snowflake'
diff --git a/setup.py b/setup.py
index b9772e2..a8cd433 100644
--- a/setup.py
+++ b/setup.py
@@ -1,10 +1,12 @@
-# import multiprocessing to avoid this bug (http://bugs.python.org/issue15881#msg170215)
-import multiprocessing
-assert multiprocessing
 import re
+import multiprocessing
 from setuptools import setup, find_packages
 
 
+# import multiprocessing to avoid this bug (http://bugs.python.org/issue15881#msg170215)
+assert multiprocessing
+
+
 def get_version():
     """
     Extracts the version number from the version.py file.