diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 582348cfd15e8c..f702925a596d4a 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -79,9 +79,9 @@
       <SourceBuild RepoName="emsdk" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25473.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25517.3">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>bd4018e4d8a9006e7f62378db31522354ab15aae</Sha>
+      <Sha>2621104ca7f734b64166a4eb3cf4927166b82da9</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
diff --git a/eng/Versions.props b/eng/Versions.props
index d557800fc52f30..316d5a37006337 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -177,7 +177,7 @@
     <NetStandardLibraryVersion>2.0.3</NetStandardLibraryVersion>
     <MicrosoftDiagnosticsToolsRuntimeClientVersion>1.0.4-preview6.19326.1</MicrosoftDiagnosticsToolsRuntimeClientVersion>
     <DNNEVersion>2.0.5</DNNEVersion>
-    <MicrosoftBuildVersion>17.8.3</MicrosoftBuildVersion>
+    <MicrosoftBuildVersion>17.8.43</MicrosoftBuildVersion>
     <MicrosoftBuildTasksCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildTasksCoreVersion>
     <MicrosoftBuildFrameworkVersion>$(MicrosoftBuildVersion)</MicrosoftBuildFrameworkVersion>
     <MicrosoftBuildUtilitiesCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildUtilitiesCoreVersion>