diff --git a/NuGet.config b/NuGet.config
index f05d586..25f97f3 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -2,6 +2,15 @@
 <configuration>
   <packageSources>
     <clear />
+    <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
+  <packageSourceMapping>
+    <packageSource key="dotnet9">
+      <package pattern="*" />
+    </packageSource>
+    <packageSource key="NuGet">
+      <package pattern="*" />
+    </packageSource>
+  </packageSourceMapping>
 </configuration>