diff --git a/NuGet.config b/NuGet.config
index 20e5a3a40005..2812314cba5f 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -11,6 +11,7 @@
     <add key="dotnet8" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json" />
     <add key="dotnet8-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8-transport/nuget/v3/index.json" />
     <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
+    <add key="darc-pub-dotnet-maintenance-packages-3b65679f" value="https://dnceng.pkgs.visualstudio.com/public/_packaging/darc-pub-dotnet-maintenance-packages-3b65679f/nuget/v3/index.json" />
     <!-- Used for the Rich Navigation indexing task -->
     <add key="richnav" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-buildservices/nuget/v3/index.json" />
   </packageSources>
diff --git a/eng/Versions.props b/eng/Versions.props
index ddc1dd44fb39..8cbce4d94f95 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -203,6 +203,21 @@
     -->
     <MicrosoftNETCoreAppRuntimeVersion>$(MicrosoftNETCoreAppRuntimewinx64Version)</MicrosoftNETCoreAppRuntimeVersion>
   </PropertyGroup>
+  <!-- The maintenance-packages dependency versions need to be conditionally selected: https://github.com/dotnet/sdk/issues/45155 -->
+  <PropertyGroup Label="Dependencies from dotnet/maintenance-packages (build-source-only)" Condition="'$(DotNetBuildSourceOnly)' == 'true'">
+    <MicrosoftBCLHashCodeVersion>6.0.0</MicrosoftBCLHashCodeVersion>
+    <SystemBuffersVersion>4.6.0</SystemBuffersVersion>
+    <SystemThreadingTasksExtensionsVersion>4.6.0</SystemThreadingTasksExtensionsVersion>
+    <SystemValueTupleVersion>4.6.0</SystemValueTupleVersion>
+    <MicrosoftIoRedistVersion>6.1.0</MicrosoftIoRedistVersion>
+  </PropertyGroup>
+  <PropertyGroup Label="Dependencies from dotnet/maintenance-packages (not build-source-only)" Condition="'$(DotNetBuildSourceOnly)' != 'true'">
+    <MicrosoftBCLHashCodeVersion>1.1.1</MicrosoftBCLHashCodeVersion>
+    <SystemBuffersVersion>4.5.0</SystemBuffersVersion>
+    <SystemThreadingTasksExtensionsVersion>4.5.4</SystemThreadingTasksExtensionsVersion>
+    <SystemValueTupleVersion>4.5.0</SystemValueTupleVersion>
+    <MicrosoftIoRedistVersion>6.0.1</MicrosoftIoRedistVersion>
+  </PropertyGroup>
   <PropertyGroup Label="Manual">
     <!-- DiagnosticAdapter package pinned temporarily (??) until migrated/deprecated -->
     <!-- This is the latest version found in dotnet-public. -->
@@ -213,7 +228,6 @@
     <MicrosoftCSharpVersion>4.7.0</MicrosoftCSharpVersion>
     <MicrosoftWin32RegistryVersion>5.0.0</MicrosoftWin32RegistryVersion>
     <NETStandardLibraryVersion>2.0.3</NETStandardLibraryVersion>
-    <SystemBuffersVersion>4.5.0</SystemBuffersVersion>
     <SystemCodeDomVersion>4.4.0</SystemCodeDomVersion>
     <SystemCommandlineExperimentalVersion>0.3.0-alpha.19317.1</SystemCommandlineExperimentalVersion>
     <SystemComponentModelVersion>4.3.0</SystemComponentModelVersion>
@@ -222,15 +236,12 @@
     <SystemPrivateUriVersion>4.3.2</SystemPrivateUriVersion>
     <SystemSecurityCryptographyX509CertificatesVersion>4.3.2</SystemSecurityCryptographyX509CertificatesVersion>
     <SystemRuntimeInteropServicesRuntimeInformationVersion>4.3.0</SystemRuntimeInteropServicesRuntimeInformationVersion>
-    <SystemThreadingTasksExtensionsVersion>4.5.4</SystemThreadingTasksExtensionsVersion>
-    <SystemValueTupleVersion>4.5.0</SystemValueTupleVersion>
     <!-- Packages developed by @aspnet, but manually updated as necessary. -->
     <MicrosoftAspNetWebApiClientVersion>5.2.6</MicrosoftAspNetWebApiClientVersion>
     <MicrosoftAspNetCoreRazorLanguageVersion>6.0.0</MicrosoftAspNetCoreRazorLanguageVersion>
     <MicrosoftAspNetCoreMvcRazorExtensionsVersion>6.0.0</MicrosoftAspNetCoreMvcRazorExtensionsVersion>
     <MicrosoftCodeAnalysisRazorVersion>6.0.0</MicrosoftCodeAnalysisRazorVersion>
     <!-- Partner teams -->
-    <MicrosoftBCLHashCodeVersion>1.1.1</MicrosoftBCLHashCodeVersion>
     <MicrosoftBuildVersion>17.4.0</MicrosoftBuildVersion>
     <MicrosoftAzureSignalRVersion>1.2.0</MicrosoftAzureSignalRVersion>
     <MicrosoftBuildFrameworkVersion>17.4.0</MicrosoftBuildFrameworkVersion>
@@ -306,7 +317,6 @@
     <MicrosoftIdentityWebGraphServiceClientVersion>3.0.0</MicrosoftIdentityWebGraphServiceClientVersion>
     <MicrosoftIdentityWebUIVersion>3.0.0</MicrosoftIdentityWebUIVersion>
     <MicrosoftIdentityWebDownstreamApiVersion>3.0.0</MicrosoftIdentityWebDownstreamApiVersion>
-    <MicrosoftIoRedistVersion>6.0.1</MicrosoftIoRedistVersion>
     <MicrosoftWindowsCsWin32Version>0.3.46-beta</MicrosoftWindowsCsWin32Version>
     <MessagePackAnalyzerVersion>$(MessagePackVersion)</MessagePackAnalyzerVersion>
     <MoqVersion>4.10.0</MoqVersion>