Deploy Django project on heroku (python 3.4.3)

Im folowing this guide step by step. Except im using python 3.4.3 and pyvenv instead of virtualenv. I have installed:

• Python 3.4.3
• Django 1.8.2
• python-psycopg2
• libpq-dev

My steps are:

1. mkdir hellodjango && cd hellodjango
2. pyvenv venv
3. source venv/bin/activate
4. pip install django-toolbelt (success)
5. django-admin.py startproject hellodjango .
6. created Procfile (web: gunicorn hellodjango.wsgi --log-file -)
7. foreman start (success and check working app in browser)
8. pip freeze > requirements.txt
9. add runtime.txt (python-3.4.3)
10. filled settings.py and wsgi.py as guide says
11. Init and commit git repo
12. heroku create (success)
13. git push heroku master (error!)

So git push heroku master says that:

Counting objects: 14, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (10/10), done.
Writing objects: 100% (14/14), 2.90 KiB | 0 bytes/s, done.
Total 14 (delta 0), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Python app detected
remote: -----> Installing runtime ( 
remote: python-3.4.3)
remote:  !     Requested runtime ( 
remote: python-3.4.3) is not available for this stack (cedar-14).
remote:  !     Aborting.  More info: http://ift.tt/1k3izyT
remote: 
remote:  !     Push rejected, failed to compile Python app
remote: 
remote: Verifying deploy...
remote: 
remote: !       Push rejected to cryptic-thicket-7510.
remote: 
To http://ift.tt/1SUTPaR
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'http://ift.tt/1SUTPaR'

As you can see main error is Requested runtime (remote: python-3.4.3) is not available for this stack (cedar-14). What am i doing wrong?