diff --git a/NuGet.config b/NuGet.config
index 944ae5b686..48c5b72a3d 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -8,7 +8,6 @@
     <clear />
     <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
     <!--  Begin: Package sources from DotNet-msbuild-Trusted -->
-    <add key="darc-pub-DotNet-msbuild-Trusted-0ca03f8" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-DotNet-msbuild-Trusted-0ca03f84/nuget/v3/index.json" />
     <!--  End: Package sources from DotNet-msbuild-Trusted -->
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0eb998d811..0101350c57 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -103,6 +103,8 @@ extends:
           enablePublishBuildAssets: true
           enablePublishUsingPipelines: $(_PublishUsingPipelines)
           enableSourceBuild: true
+          sourceBuildParameters:
+            enableInternalSources: true
           enableTelemetry: true
           helixRepo: dotnet/fsharp
           jobs:
diff --git a/eng/SourceBuildPrebuiltBaseline.xml b/eng/SourceBuildPrebuiltBaseline.xml
index a3c0b4e661..9588baeee1 100644
--- a/eng/SourceBuildPrebuiltBaseline.xml
+++ b/eng/SourceBuildPrebuiltBaseline.xml
@@ -28,6 +28,6 @@
   </IgnorePatterns>
 
   <Usages>
-    <Usage Id="System.Formats.Asn1" Version="8.0.1" />
+    <Usage Id="System.Formats.Asn1" Version="8.0.1"/>
   </Usages>
 </UsageData>
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index a3b61734d4..65e73d5efe 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -7,26 +7,26 @@
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.msbuild" Version="17.13.22-preview-25174-08">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.msbuild" Version="17.13.26-preview-25272-04">
       <Uri>https://github.com/dotnet/msbuild</Uri>
-      <Sha>0ca03f84b7848ce9d7d3e5d1f68c5e090efa4f30</Sha>
+      <Sha>c192adbb5252264481e8c046a8e0694f7fc7855b</Sha>
       <SourceBuild RepoName="msbuild" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.Build" Version="17.13.22">
+    <Dependency Name="Microsoft.Build" Version="17.13.26">
       <Uri>https://github.com/dotnet/msbuild</Uri>
-      <Sha>0ca03f84b7848ce9d7d3e5d1f68c5e090efa4f30</Sha>
+      <Sha>c192adbb5252264481e8c046a8e0694f7fc7855b</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Framework" Version="17.13.22">
+    <Dependency Name="Microsoft.Build.Framework" Version="17.13.26">
       <Uri>https://github.com/dotnet/msbuild</Uri>
-      <Sha>0ca03f84b7848ce9d7d3e5d1f68c5e090efa4f30</Sha>
+      <Sha>c192adbb5252264481e8c046a8e0694f7fc7855b</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Tasks.Core" Version="17.13.22">
+    <Dependency Name="Microsoft.Build.Tasks.Core" Version="17.13.26">
       <Uri>https://github.com/dotnet/msbuild</Uri>
-      <Sha>0ca03f84b7848ce9d7d3e5d1f68c5e090efa4f30</Sha>
+      <Sha>c192adbb5252264481e8c046a8e0694f7fc7855b</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Build.Utilities.Core" Version="17.13.22">
+    <Dependency Name="Microsoft.Build.Utilities.Core" Version="17.13.26">
       <Uri>https://github.com/dotnet/msbuild</Uri>
-      <Sha>0ca03f84b7848ce9d7d3e5d1f68c5e090efa4f30</Sha>
+      <Sha>c192adbb5252264481e8c046a8e0694f7fc7855b</Sha>
     </Dependency>
     <Dependency Name="System.Reflection.Metadata" Version="8.0.0">
       <Uri>https://github.com/dotnet/runtime</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 5ce287e802..954e381e25 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -102,7 +102,7 @@
     <MicrosoftVisualStudioShellPackagesVersion>17.10.40152</MicrosoftVisualStudioShellPackagesVersion>
     <VisualStudioProjectSystemPackagesVersion>17.10.526-pre-g1b474069f5</VisualStudioProjectSystemPackagesVersion>
     <MicrosoftVisualStudioThreadingPackagesVersion>17.10.41</MicrosoftVisualStudioThreadingPackagesVersion>
-    <MicrosoftBuildVersion>17.13.22</MicrosoftBuildVersion>
+    <MicrosoftBuildVersion>17.13.26</MicrosoftBuildVersion>
     <!-- Roslyn packages -->
     <MicrosoftCodeAnalysisEditorFeaturesVersion>$(RoslynVersion)</MicrosoftCodeAnalysisEditorFeaturesVersion>
     <MicrosoftCodeAnalysisEditorFeaturesTextVersion>$(RoslynVersion)</MicrosoftCodeAnalysisEditorFeaturesTextVersion>
@@ -138,9 +138,9 @@
     <MicrosoftVisualStudioShellImmutable150Version>15.0.25123-Dev15Preview</MicrosoftVisualStudioShellImmutable150Version>
     <!-- -->
     <!-- Microsoft Build packages -->
-    <MicrosoftBuildFrameworkVersion>17.13.22</MicrosoftBuildFrameworkVersion>
-    <MicrosoftBuildTasksCoreVersion>17.13.22</MicrosoftBuildTasksCoreVersion>
-    <MicrosoftBuildUtilitiesCoreVersion>17.13.22</MicrosoftBuildUtilitiesCoreVersion>
+    <MicrosoftBuildFrameworkVersion>$(MicrosoftBuildVersion)</MicrosoftBuildFrameworkVersion>
+    <MicrosoftBuildTasksCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildTasksCoreVersion>
+    <MicrosoftBuildUtilitiesCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildUtilitiesCoreVersion>
     <!-- -->
     <!-- Visual Studio Editor packages -->
     <MicrosoftVisualStudioCoreUtilityVersion>$(VisualStudioEditorPackagesVersion)</MicrosoftVisualStudioCoreUtilityVersion>
diff --git a/eng/build.sh b/eng/build.sh
index 1263445973..892997057a 100755
--- a/eng/build.sh
+++ b/eng/build.sh
@@ -171,6 +171,13 @@ while [[ $# > 0 ]]; do
       tfm=$2
       shift
       ;;
+    # nop implementations of runtime* args sourcebuild might pass in on internal builds
+    --runtimesourcefeed)
+      shift
+      ;;
+    --runtimesourcefeedkey)
+      shift
+      ;;
     /p:*)
       properties="$properties $1"
       ;;