Extension require System.Runtime.CompilerServices.Unsafe on Visual Studio 2015

Question

I'm testing my extension on VS2015, VS2017 and VS2019. On 2019 version all works fine, but for 2015 and 2017 it throw an error

System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Не удается найти указанный файл.
File name: 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at System.Span`1..ctor(T[] array)
   at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, Type returnType, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
   at Common.Json.Deserialize[T](String json)
   at Extension.Service.ApiService.<GetSastSettingsAsync>d__5.MoveNext() in C:\Projects\VisualStudio.Extension\ApiService.cs:line 50
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Extension.Service.ApiService.<IsCodeEnabledAsync>d__6.MoveNext() in C:\Projects\VisualStudio\Extension\Service\ApiService.cs:line 69

I tried to add this in my app.config file

<bindingRedirect oldVersion="0.0.0.0-4.0.4.1" newVersion="4.0.4.1"/>

But it doesnt help.

Maybe some one can suggest solution/fix?

Thanks!