diff --git a/.travis.yml b/.travis.yml
index 4179019..2b17e2a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ python:
 env:
   - DJANGO=1.6.1 DB=postgres
 install:
+  - python setup.py install
   - pip install -q Django==$DJANGO
   - pip install -r requirements.txt
 before_script:
diff --git a/README.md b/README.md
index 2c6b519..8f8734f 100644
--- a/README.md
+++ b/README.md
@@ -52,17 +52,15 @@ In order to change the duration of a lock, set the DB_MUTEX_TTL_SECONDS variable
 Django DB Mutex can be used with celery's tasks in the following manner.
 
     from celery import Task
-    from abc import ABCMeta, abstractmethod
 
     class NonOverlappingTask(Task):
         __metaclass__ = ABCMeta
 
-        @abstractmethod
         def run_worker(self, *args, **kwargs):
             """
             Run worker code here.
             """
-            pass
+            raise NotImplementedError()
 
         def run(self, *args, **kwargs):
             try:
diff --git a/db_mutex/VERSION b/db_mutex/VERSION
index 49d5957..d917d3e 100644
--- a/db_mutex/VERSION
+++ b/db_mutex/VERSION
@@ -1 +1 @@
-0.1
+0.1.2