Unreal Engine 4.12.5 opens Visual Studio 2012 (Help)

So I just started a lighting and shading class but I wanted to take the time and see what’s up with the coding. I have Visual Studio 2012 and 2015 but every time I open any version of Unreal (10.4 or 12.5) it uses the 2012 version and I don’t know how to change it.

well , you can open vs2015 then load ue4.sln from there
or select open with in the context menu