.NET version for Hangfire 1.3

question
1

Hi
I tried to install Hangfire 1.3 NuGet package, but failed
I tried to use .NET 2.0, 3.5, 4.0 as well but still failed. I can only make it work to install Hangfire 1.1.NET(4.0)

I would like to know, what .NET version should I use for Hangfire 1.3? tq

Attempting to resolve dependency 'Hangfire.Core (= 1.3.3)'.
Attempting to resolve dependency 'Owin (≥ 1.0)'.
Attempting to resolve dependency 'Newtonsoft.Json (≥ 5.0.0)'.
Attempting to resolve dependency 'Hangfire.SqlServer (= 1.3.3)'.
Attempting to resolve dependency 'Microsoft.Owin.Host.SystemWeb (≥ 3.0.0)'.
Attempting to resolve dependency 'Microsoft.Owin (≥ 3.0.0)'.
Installing 'Owin 1.0'.
Successfully installed 'Owin 1.0'.
Installing 'Newtonsoft.Json 5.0.1'.
Successfully installed 'Newtonsoft.Json 5.0.1'.
Installing 'HangFire.Core 1.3.3'.
Successfully installed 'HangFire.Core 1.3.3'.
Installing 'HangFire.SqlServer 1.3.3'.
Successfully installed 'HangFire.SqlServer 1.3.3'.
Installing 'Microsoft.Owin 3.0.0'.
Successfully installed 'Microsoft.Owin 3.0.0'.
Installing 'Microsoft.Owin.Host.SystemWeb 3.0.0'.
Successfully installed 'Microsoft.Owin.Host.SystemWeb 3.0.0'.
Installing 'HangFire 1.3.3'.
Successfully installed 'HangFire 1.3.3'.
Adding 'Owin 1.0' to MvcApplication1.Tests.
Successfully added 'Owin 1.0' to MvcApplication1.Tests.
Adding 'Newtonsoft.Json 5.0.1' to MvcApplication1.Tests.
Successfully added 'Newtonsoft.Json 5.0.1' to MvcApplication1.Tests.
Adding 'Hangfire.Core 1.3.3' to MvcApplication1.Tests.
Uninstalling 'Hangfire.Core 1.3.3'.
Successfully uninstalled 'Hangfire.Core 1.3.3'.
Uninstalling 'Newtonsoft.Json 5.0.1'.
Successfully uninstalled 'Newtonsoft.Json 5.0.1'.
Uninstalling 'Owin 1.0'.
Successfully uninstalled 'Owin 1.0'.
Install failed. Rolling back...
Could not install package 'Hangfire.Core 1.3.3'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.