diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 051b5285a106..8a0bec0a7ccc 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -189,9 +189,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>4122c63a13cfe40e97ac1f9ef01d8110a66943f4</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23428.2">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23429.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>13370d763ada41a7eacae2b19ad1b2e35dd78ae6</Sha>
+      <Sha>0603839a51f5e18b89c60a3690aff5e81fa666ca</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.symreader" Version="2.0.0-beta-23228-03">
diff --git a/eng/Versions.props b/eng/Versions.props
index 018fd4a38b92..f202322545fa 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -162,7 +162,7 @@
     <MicrosoftDotNetBuildTasksTemplatingVersion>8.0.0-beta.23419.1</MicrosoftDotNetBuildTasksTemplatingVersion>
     <MicrosoftDotNetRemoteExecutorVersion>8.0.0-beta.23419.1</MicrosoftDotNetRemoteExecutorVersion>
     <!-- Packages from dotnet/source-build-externals -->
-    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23428.2</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23429.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>8.0.0-alpha.1.23424.1</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->
@@ -304,7 +304,7 @@
     <MonoCecilVersion>0.11.2</MonoCecilVersion>
     <MonoTextTemplatingVersion>2.2.1</MonoTextTemplatingVersion>
     <NewtonsoftJsonBsonVersion>1.0.2</NewtonsoftJsonBsonVersion>
-    <NewtonsoftJsonVersion>13.0.1</NewtonsoftJsonVersion>
+    <NewtonsoftJsonVersion>13.0.3</NewtonsoftJsonVersion>
     <NSwagApiDescriptionClientVersion>13.0.4</NSwagApiDescriptionClientVersion>
     <PhotinoNETVersion>1.1.6</PhotinoNETVersion>
     <MicrosoftPlaywrightVersion>1.28.0</MicrosoftPlaywrightVersion>
diff --git a/eng/tools/RepoTasks/RepoTasks.csproj b/eng/tools/RepoTasks/RepoTasks.csproj
index 5f9e4f60ae98..aa693e2131f6 100644
--- a/eng/tools/RepoTasks/RepoTasks.csproj
+++ b/eng/tools/RepoTasks/RepoTasks.csproj
@@ -15,6 +15,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <!-- Explicitly reference the desired version of Newtonsoft.Json to avoid getting an older version
+         from the dependency on NuGet.Packaging which would cause a source-built prebuilt. -->
+    <PackageReference Include="Newtonsoft.Json" Version="$(NewtonsoftJsonVersion)" />
     <PackageReference Include="NuGet.Packaging" Version="$(NuGetPackagingVersion)" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="$(MicrosoftExtensionsDependencyModelVersion)" />
   </ItemGroup>