diff --git a/eng/Directory.Packages.props b/eng/Directory.Packages.props
index ea4b42a8e1785..63bbd6c066812 100644
--- a/eng/Directory.Packages.props
+++ b/eng/Directory.Packages.props
@@ -31,9 +31,9 @@
   -->
 
   <ItemGroup Condition="'$(DotnetBuildFromSource)' == 'true'">
-    <PackageVersion Include="Microsoft.Build" Version="17.3.2" />
-    <PackageVersion Include="Microsoft.Build.Framework" Version="17.3.2" />
-    <PackageVersion Include="Microsoft.Build.Tasks.Core" Version="17.3.2" />
+    <PackageVersion Include="Microsoft.Build" Version="17.3.4" />
+    <PackageVersion Include="Microsoft.Build.Framework" Version="17.3.4" />
+    <PackageVersion Include="Microsoft.Build.Tasks.Core" Version="17.3.4" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(DotnetBuildFromSource)' != 'true' and '$(TargetFramework)' != 'net472'">
@@ -202,7 +202,7 @@
     <PackageVersion Include="System.Security.Principal" Version="4.3.0" />
     <PackageVersion Include="System.Text.Encoding.CodePages" Version="7.0.0" />
     <PackageVersion Include="System.Text.Encoding.Extensions" Version="4.3.0" />
-    <PackageVersion Include="System.Threading.Tasks.Dataflow" Version="8.0.0" />
+    <PackageVersion Include="System.Threading.Tasks.Dataflow" Version="$(SystemThreadingTasksDataflowVersion)" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
     <PackageVersion Include="System.Windows.Extensions" Version="$(SystemWindowsExtensionsVersion)" />
 
diff --git a/eng/SourceBuildPrebuiltBaseline.xml b/eng/SourceBuildPrebuiltBaseline.xml
index 592d3954059e8..2f6e57b3eb31a 100644
--- a/eng/SourceBuildPrebuiltBaseline.xml
+++ b/eng/SourceBuildPrebuiltBaseline.xml
@@ -22,21 +22,27 @@
     <UsagePattern IdentityGlob="Microsoft.NETCore.App.Ref/7.0*" />
 
      <!-- This is upgraded to latest version in full source-build and can be baselined for repo build -->
+    <UsagePattern IdentityGlob="Microsoft.Bcl.AsyncInterfaces/8.0*" />
+    <UsagePattern IdentityGlob="Microsoft.Extensions.DependencyInjection.Abstractions/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Configuration*/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.DependencyInjection/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Logging*/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Options.ConfigurationExtension*/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Options/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Primitives/8.0*" />
-    <UsagePattern IdentityGlob="System.Composition*/7.0*" />
+    <UsagePattern IdentityGlob="System.Collections.Immutable/8.0*" />
+    <UsagePattern IdentityGlob="System.Composition*/8.0*" />
     <UsagePattern IdentityGlob="System.Configuration.ConfigurationManager/8.0*" />
     <UsagePattern IdentityGlob="System.Diagnostics.DiagnosticSource/8.0*" />
     <UsagePattern IdentityGlob="System.Diagnostics.EventLog/8.0*" />
+    <UsagePattern IdentityGlob="System.IO.Pipelines/8.0*" />
+    <UsagePattern IdentityGlob="System.Reflection.Metadata/8.0*" />
     <UsagePattern IdentityGlob="System.Resources.Extensions/8.0*" />
     <UsagePattern IdentityGlob="System.Security.Cryptography.ProtectedData/8.0*" />
     <UsagePattern IdentityGlob="System.Security.Permissions/8.0*" />
     <UsagePattern IdentityGlob="System.Text.Encodings.Web/8.0*" />
     <UsagePattern IdentityGlob="System.Text.Json/8.0*" />
+    <UsagePattern IdentityGlob="System.Threading.Tasks.Dataflow/8.0*" />
     <UsagePattern IdentityGlob="System.Windows.Extensions/8.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Configuration*/7.0*" />
     <UsagePattern IdentityGlob="Microsoft.Extensions.Logging*/7.0*" />
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 4d8f571a33d6d..9b4e291689f1a 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -2,15 +2,15 @@
 <Dependencies>
   <ProductDependencies>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.24168.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.24256.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>b46b7e6859f4094cd7f3e00dc0471d62f5d8d051</Sha>
+      <Sha>2b7510ccda2be01e2a2b48598498dca24fb69c3a</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.24161.2">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="8.0.0-alpha.1.24257.1">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>8d6e9cf10f64ff8fc02e434b516f6ca87c4b7215</Sha>
+      <Sha>2ae84974a931d184c92865610453a65903118796</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="System.CommandLine" Version="2.0.0-beta4.24126.1">
@@ -84,6 +84,10 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>5535e31a712343a63f5d7d796cd874e563e5ac14</Sha>
     </Dependency>
+    <Dependency Name="System.Threading.Tasks.Dataflow" Version="8.0.0">
+      <Uri>https://github.com/dotnet/runtime</Uri>
+      <Sha>5535e31a712343a63f5d7d796cd874e563e5ac14</Sha>
+    </Dependency>
     <Dependency Name="System.Reflection.Metadata" Version="8.0.0">
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>5535e31a712343a63f5d7d796cd874e563e5ac14</Sha>
@@ -125,7 +129,7 @@
       <Sha>73f0850939d96131c28cf6ea6ee5aacb4da0083a</Sha>
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.xliff-tasks" Version="1.0.0-beta.23475.1" CoherentParentDependency="Microsoft.DotNet.Arcade.Sdk">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.xliff-tasks" Version="1.0.0-beta.23475.1">
       <Uri>https://github.com/dotnet/xliff-tasks</Uri>
       <Sha>73f0850939d96131c28cf6ea6ee5aacb4da0083a</Sha>
       <SourceBuild RepoName="xliff-tasks" ManagedOnly="true" />
diff --git a/eng/Versions.props b/eng/Versions.props
index ca2c67bff31aa..45e129c7d68b7 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -34,6 +34,7 @@
     <!-- Note: When updating SystemTextJsonVersion ensure that the version is no higher than what is used by MSBuild. -->
     <SystemTextEncodingsWebVersion>8.0.0</SystemTextEncodingsWebVersion>
     <SystemTextJsonVersion>8.0.0</SystemTextJsonVersion>
+    <SystemThreadingTasksDataflowVersion>8.0.0</SystemThreadingTasksDataflowVersion>
     <SystemWindowsExtensionsVersion>8.0.0</SystemWindowsExtensionsVersion>
     <MicrosoftBclAsyncInterfacesVersion>8.0.0</MicrosoftBclAsyncInterfacesVersion>
     <MicrosoftCodeAnalysisAnalyzersVersion>3.3.4</MicrosoftCodeAnalysisAnalyzersVersion>
diff --git a/src/Workspaces/Core/MSBuild.BuildHost/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.csproj b/src/Workspaces/Core/MSBuild.BuildHost/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.csproj
index 063d82e3b829a..bac4691c9b259 100644
--- a/src/Workspaces/Core/MSBuild.BuildHost/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.csproj
+++ b/src/Workspaces/Core/MSBuild.BuildHost/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.csproj
@@ -22,11 +22,11 @@
     <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
   <ItemGroup>
-    <!-- We specifically reference Microsoft.Build 17.3.2, since it's the oldest version still compatible net6.0. The version targeted is only used for build time, since
+    <!-- We specifically reference Microsoft.Build 17.3.4, since it's the oldest version still compatible net6.0. The version targeted is only used for build time, since
          we use MSBuildLocator to discover the proper version at runtime. -->
-    <PackageReference Include="Microsoft.Build" VersionOverride="17.3.2" ExcludeAssets="Runtime" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.Build.Framework" VersionOverride="17.3.2" ExcludeAssets="Runtime" />
-    <PackageReference Include="Microsoft.Build.Tasks.Core" VersionOverride="17.3.2" ExcludeAssets="Runtime" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.Build" VersionOverride="17.3.4" ExcludeAssets="Runtime" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.Build.Framework" VersionOverride="17.3.4" ExcludeAssets="Runtime" />
+    <PackageReference Include="Microsoft.Build.Tasks.Core" VersionOverride="17.3.4" ExcludeAssets="Runtime" PrivateAssets="All" />
     <PackageReference Include="Microsoft.Build.Locator" PrivateAssets="All" />
     <PackageReference Include="System.Text.Json" />
     <PackageReference Include="System.CommandLine" />