Specify Python version in virtualenv

Question

I am attempting to create a virtual environment that uses Python 2.7.11 (rather than Ubuntu's 2.7.6). I can successfully create the virtual environment using the following code:

virtualenv -p /home/stmist/opt/Python-2.7.11/bin/python2.7 ~/test

However, running the following code:

source ~/test/bin/activate
python -V

indicates that the virtual environment is running 2.7.6. Any suggestions?

Update:

When inside the virtual environment, "pip" modifies packages for 2.7.11, not 2.7.6. I can run Python 2.7.11 using /home/stmist/opt/Python-2.7.11/bin/python2.7. So, the virtual environment is usable, but not ideal.

Answer 1

After restarting my computer, the virtual environment is now using Python 2.7.11. I don't know whether this is due to the restart, or something else along the way. Thanks to everyone for your help.