title: Is it safe for an application using .NET 4.0 if the framework is replaced with .NET 4.5?
body: <p>I'm using Windows 7 and VisualStudio 2010. The application was developing is using the .net framework 4.0. Is it safe if I replace it with .NET 4.5? Will it break the app? </p>
  
  <p>Will it matter if I'm developing using the framework 4.5 (without using its new features), and my teammates are using 4.0 and our production and staging are also using the 4.0?</p>
  
  <p>Need to advise.</p>