From the documentation:
When using Visual Studio, it is easy to find out whether newer versions of the NuGet packages used by your project are available, by using the NuGet Package Manager. However, the .NET Core command-line tools do not provide a built-in way for you to report on outdated NuGet packages.
dotnet-outdated is a .NET Core Global tool that allows you to quickly report on any outdated NuGet packages in your .NET Core and .NET Standard projects.
This is a great way to keep your applications up-to-date and can easily be integrated as part of your DevOps processes.
Install dotnet-outdated as a global tool:
dotnet tool install --global dotnet-outdated-tool
Now you can invoke it from your project or solution folder:
dotnet outdated
This is how the output looks like for one of my projects:
The colors make it very clear. Here is the related legend:
You can automatically upgrade packages by passing the ‘-u’ parameter:
dotnet outdated -u