diff --git a/NuGet.config b/NuGet.config
index cfa230142..23cbe6c03 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -1,8 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
     <clear />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
+    <add key="Dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources />
 </configuration>
\ No newline at end of file
diff --git a/src/OpenTelemetry.Api/OpenTelemetry.Api.csproj b/src/OpenTelemetry.Api/OpenTelemetry.Api.csproj
index 97e7a11e7..9217946c7 100644
--- a/src/OpenTelemetry.Api/OpenTelemetry.Api.csproj
+++ b/src/OpenTelemetry.Api/OpenTelemetry.Api.csproj
@@ -19,7 +19,7 @@
   </PropertyGroup>
   -->
   <ItemGroup>
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.6.0" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="5.0.0-preview.4.20251.6" />
   </ItemGroup>
 
 </Project>
\ No newline at end of file
diff --git a/test/OpenTelemetry.Adapter.AspNetCore.Tests/OpenTelemetry.Adapter.AspNetCore.Tests.csproj b/test/OpenTelemetry.Adapter.AspNetCore.Tests/OpenTelemetry.Adapter.AspNetCore.Tests.csproj
index 16f1b727f..93c002387 100644
--- a/test/OpenTelemetry.Adapter.AspNetCore.Tests/OpenTelemetry.Adapter.AspNetCore.Tests.csproj
+++ b/test/OpenTelemetry.Adapter.AspNetCore.Tests/OpenTelemetry.Adapter.AspNetCore.Tests.csproj
@@ -30,6 +30,7 @@
     <ProjectReference Include="..\..\src\OpenTelemetry\OpenTelemetry.csproj" />
     <ProjectReference Include="..\TestApp.AspNetCore.3.1\TestApp.AspNetCore.3.1.csproj" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="3.0.0" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="5.0.0-preview.4.20251.6" />
   </ItemGroup>
 
   <ItemGroup>