Incorrect .Net framework version is being displayed on server error page.

I have IIS 8.5 and .Net Framework version 4.7.2 installed in my machine. 
My web application target framework is set to 4.7.2 in Visual Studio.  
However, I have notice that when I get an application run time exception, the version information displayed at the bottom of the yellow server page says .Net Framework Version: 4.0.30319; Please may I know why it is not showing ver4.7.2.