diff --git a/WebPush.Test/WebPush.Test.csproj b/WebPush.Test/WebPush.Test.csproj
index ca25105..e697fbe 100755
--- a/WebPush.Test/WebPush.Test.csproj
+++ b/WebPush.Test/WebPush.Test.csproj
@@ -1,8 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net45;net46;net471;net48;net5.0;netcoreapp2.0;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net462;net48;net6.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>WebPush.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>
@@ -10,7 +12,7 @@
     <PackageReference Include="Moq" Version="4.10.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.2.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.2.0" />
-    <PackageReference Include="RichardSzalay.MockHttp" Version="5.0.0" />
+    <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/WebPush.Test/WebPush.snk b/WebPush.Test/WebPush.snk
new file mode 100644
index 0000000..eebabb2
Binary files /dev/null and b/WebPush.Test/WebPush.snk differ
diff --git a/WebPush/WebPush.csproj b/WebPush/WebPush.csproj
index 068e02a..a765575 100755
--- a/WebPush/WebPush.csproj
+++ b/WebPush/WebPush.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net45;net46;net471;net48;net5.0;netstandard1.3;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net6.0;netstandard2.0</TargetFrameworks>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Version>1.0.12</Version>
     <Authors>Cory Thompson</Authors>
@@ -15,21 +15,17 @@
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>WebPush.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>
 
-
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.1.3" />
   </ItemGroup>
 
-
-  <ItemGroup>
-    <Reference Include="System.Net.Http" Condition="'$(TargetFramework)' == 'net46' OR '$(TargetFramework)' == 'net45' OR '$(TargetFramework)' == 'net48' OR '$(TargetFramework)' == 'net471'" />
-  </ItemGroup>
-
 </Project>
diff --git a/WebPush/WebPush.snk b/WebPush/WebPush.snk
new file mode 100644
index 0000000..eebabb2
Binary files /dev/null and b/WebPush/WebPush.snk differ
diff --git a/WebPush/WebPushClient.cs b/WebPush/WebPushClient.cs
index df1bfe1..8a48b56 100644
--- a/WebPush/WebPushClient.cs
+++ b/WebPush/WebPushClient.cs
@@ -9,7 +9,11 @@
 using WebPush.Model;
 using WebPush.Util;
 
-[assembly: InternalsVisibleTo("WebPush.Test")]
+[assembly: InternalsVisibleTo("WebPush.Test, PublicKey=00240000048000009400000006020000002400005253413100040000010001000dfb13e125f77d" +
+                                                      "9b8c3d9b65a48ce8cfa839fa1105fa51724e170d5c286a0cfe212f410abb22a989d70fa517f488" +
+                                                      "bcdbfeb494395ab8faec69538fd88709ba9a785a56a3ce109d71d06d0ca854d6a30299ea35d0d4" +
+                                                      "9d91dd5200e1fe0b9b9acc50ba3a565975ddae5a8dd2323f45fbf1a784655c5086f3d0230f7056" +
+                                                      "75fc89dd")]
 
 namespace WebPush
 {