diff --git a/SourceGenerator/SourceGenerator.csproj b/SourceGenerator/SourceGenerator.csproj
index 74ade31a6..355ca46da 100644
--- a/SourceGenerator/SourceGenerator.csproj
+++ b/SourceGenerator/SourceGenerator.csproj
@@ -6,6 +6,8 @@
     <LangVersion>preview</LangVersion>
     <AssemblyName>Microsoft.Azure.Functions.Worker.Sdk</AssemblyName>
     <RootNamespace>Microsoft.Azure.Functions.Worker.Sdk</RootNamespace>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/key.snk b/key.snk
new file mode 100644
index 000000000..48b0a3a05
Binary files /dev/null and b/key.snk differ
diff --git a/samples/FunctionApp/FunctionApp.csproj b/samples/FunctionApp/FunctionApp.csproj
index 458a2e4c0..ddda71a33 100644
--- a/samples/FunctionApp/FunctionApp.csproj
+++ b/samples/FunctionApp/FunctionApp.csproj
@@ -5,10 +5,13 @@
     <AzureFunctionsVersion>v3</AzureFunctionsVersion>
     <OutputType>Exe</OutputType>
     <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
     <DefineConstants>DEBUG;TRACE</DefineConstants>
   </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Http" Version="3.0.8" />
     <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="4.0.3" />
diff --git a/src/DotNetWorker/DotNetWorker.csproj b/src/DotNetWorker/DotNetWorker.csproj
index 0cad1620c..847440e93 100644
--- a/src/DotNetWorker/DotNetWorker.csproj
+++ b/src/DotNetWorker/DotNetWorker.csproj
@@ -5,6 +5,8 @@
     <TargetFramework>net5.0</TargetFramework>
     <AssemblyName>Microsoft.Azure.Functions.Worker</AssemblyName>
     <RootNamespace>Microsoft.Azure.Functions.Worker</RootNamespace>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.13.0" />
@@ -22,5 +24,4 @@
   <ItemGroup>
      <Protobuf Include=".\protobuf\src\proto\**\*.proto" ProtoRoot=".\protobuf\src\proto" />
   </ItemGroup>
-
 </Project>
\ No newline at end of file
diff --git a/src/DotNetWorker/Properties/AssemblyInfo.cs b/src/DotNetWorker/Properties/AssemblyInfo.cs
index 10662d181..03f01e4db 100644
--- a/src/DotNetWorker/Properties/AssemblyInfo.cs
+++ b/src/DotNetWorker/Properties/AssemblyInfo.cs
@@ -1,4 +1,4 @@
 using System.Runtime.CompilerServices;
 
-[assembly: InternalsVisibleTo("Microsoft.Azure.Functions.WorkerTests")]
-[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
+[assembly: InternalsVisibleTo("Microsoft.Azure.Functions.WorkerTests, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2, PublicKey=00240000048000009400000006020000002400005253413100040000010001005148be37ac1d9f58bd40a2e472c9d380d635b6048278f7d47480b08c928858f0f7fe17a6e4ce98da0e7a7f0b8c308aecd9e9b02d7e9680a5b5b75ac7773cec096fbbc64aebd429e77cb5f89a569a79b28e9c76426783f624b6b70327eb37341eb498a2c3918af97c4860db6cdca4732787150841e395a29cfacb959c1fd971c1")]
diff --git a/test/DotNetWorkerTests/DotNetWorkerTests.csproj b/test/DotNetWorkerTests/DotNetWorkerTests.csproj
index eb950982d..2da660999 100644
--- a/test/DotNetWorkerTests/DotNetWorkerTests.csproj
+++ b/test/DotNetWorkerTests/DotNetWorkerTests.csproj
@@ -5,6 +5,8 @@
     <IsPackable>false</IsPackable>
     <AssemblyName>Microsoft.Azure.Functions.WorkerTests</AssemblyName>
     <RootNamespace>Microsoft.Azure.Functions.WorkerTests</RootNamespace>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>