Manually force a NuGet reference to update at a project in Visual Studio 2015.

1. Right-click on "References" and pick "Manage NuGet Packages..." from the menu that appears.
2. Find the line item to update at the scrollable left content.
3. If there is a newer version, an icon of a blue circle with a white arrow in it pointing upwards will be seen when you mouse over the line item at the right side of the line item.
4. Click the icon.