Microsoft released new version of asp.net 4.5 last week.
Even though it is 4.5, it does not create any new version under IIS 7 application pool settings, it still remain as ASP.NET 4.0
Only change I noticed is that
before version number was 4.0.30319.269 and after installing 4.5 it changed to 4.0.30319.17929
If you have a website running on 4 you can easily change it to 4.5 doing the following update on web.config file
<httpRuntime targetFramework=”4.5″ />
Stand alone version of asp.net 4.5 installer can be downloaded from