After installing Burst and Collections packages I got a new internal Unity jSon.Net package called " firstname.lastname@example.org". and problem is that I am also using JSon.Net in my project that is mandatory for me. And it is colliding with the internal Unity JSon.Net package According to documentation: https://docs.unity3d.com/Packagesemail@example.com/manual/index.html This is a package intended for internal Unity Development Projects and as such this package is not supported. Use it at your own risk. Hm but I am forced to use it because I cannot block it from being downloaded as a dependency of one of the packages. As a temporal solution, I've removed it from PackageCache but Unity time to time restores it and it is annoying. I've created a bug ticket and waiting for a response. How can I fix this issue? Is there a workaround for it?