I just pushed a new version of MVVM Light to Nuget. The new version is 4.1.27.0. The difference towards the previous version (4.1.26.1) and this one is that I am not depending on the CommonServiceLocator Nuget package instead of providing my own. However, the CommonServiceLocator does not exist for all MVVM Light-supported frameworks. We have the following situation: WPF3.5 SP1, WPF4, WPF4.5: Depends on the CommonServiceLocator Nuget package. Silverlight 4, Silverlight 5: Depends on the CommonServiceLocator ......