Difference between conda fastai library and fastai github repo

Maybe this is a silly question,… is there supposed to be a different between what conda ships as a package for fastai and the live github repository master?

I have installed fastai on a conda environment. I can access the source code of the library by looking in my miniconda folder e.g. ~/miniconda3/envs/ml-training/lib/python3.7/site-packages/fastai/vision/gan.py

Why is that source code different from what I can see in github e.g. https://github.com/fastai/fastai/blob/master/fastai/vision/gan.py

Can you make it the same?

PS. I did update my conda environment but nothing it’s still not the same?