14.04 - Upgrading CUDA from 6.5 to 7

On Ubuntu 14.04, I have CUDA 6.5 installed. I want to upgrade to CUDA 7.0. So, I followed the instructions at Installing and testing CUDA in Ubuntu 14.04, but using the CUDA 7 run file instead of CUDA 6.5. After doing this, I rebooted my machine, and ran nvcc --version. However, this prints out Cuda compilation tools, release 6.5, V6.5.16. Why has CUDA 7.0 not been installed properly?