diff --git a/eng/Versions.props b/eng/Versions.props
index d261d3d3d9..947a6569b4 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -19,6 +19,7 @@
     <CssParserReleaseVersionSuffix>20230414.1</CssParserReleaseVersionSuffix>
     <HumanizerReleaseVersion>2.14.1</HumanizerReleaseVersion>
     <MSBuildLocatorReleaseVersion>1.10.2</MSBuildLocatorReleaseVersion>
+    <NewtonsoftJsonReleaseVersion>13.0.3</NewtonsoftJsonReleaseVersion>
     <SolutionPersistenceVersion>1.0.52</SolutionPersistenceVersion>
     <SpectreConsoleReleaseVersion>0.54.0</SpectreConsoleReleaseVersion>
   </PropertyGroup>
diff --git a/src/externalPackages/projects/azure-activedirectory-identitymodel-extensions-for-dotnet.proj b/src/externalPackages/projects/azure-activedirectory-identitymodel-extensions-for-dotnet.proj
index 97d6471fa2..26c7ec5db2 100644
--- a/src/externalPackages/projects/azure-activedirectory-identitymodel-extensions-for-dotnet.proj
+++ b/src/externalPackages/projects/azure-activedirectory-identitymodel-extensions-for-dotnet.proj
@@ -7,7 +7,7 @@
     <!-- The FileVersion revision from the Microsoft-shipped package. This must be updated
          when the submodule is updated. See https://github.com/dotnet/source-build/issues/5509 -->
     <FileVersionRevision>50722</FileVersionRevision>
-    <!-- A NuGet package produced by this component, used by tests to validate FileVersionRevision. -->
+    <!-- Used by the update-external-metadata script to determine the package to download. -->
     <FileVersionValidationPackage>Microsoft.IdentityModel.Tokens</FileVersionValidationPackage>
   </PropertyGroup>
 
diff --git a/src/externalPackages/projects/newtonsoft-json.proj b/src/externalPackages/projects/newtonsoft-json.proj
index 1702bbf0bd..b3c2fb334d 100644
--- a/src/externalPackages/projects/newtonsoft-json.proj
+++ b/src/externalPackages/projects/newtonsoft-json.proj
@@ -14,6 +14,12 @@
     <DotNetToolArgs>$(DotNetToolArgs) /p:PublicSign=true</DotNetToolArgs>
     <DotNetToolArgs>$(DotNetToolArgs) /p:TreatWarningsAsErrors=false</DotNetToolArgs>
     <DotNetToolArgs>$(DotNetToolArgs) /p:AdditionalConstants=SIGNED</DotNetToolArgs>
+    <!-- The upstream build computes a date-based FileVersion revision via PowerShell (GetVersion in build.ps1).
+         Set it here to match the official NuGet package. See https://github.com/dotnet/source-build/issues/5511 -->
+    <FileVersionRevision>27908</FileVersionRevision>
+    <!-- Used by the update-external-metadata script to determine the package to download. -->
+    <FileVersionValidationPackage>Newtonsoft.Json</FileVersionValidationPackage>
+    <DotNetToolArgs>$(DotNetToolArgs) /p:FileVersion=$(NewtonsoftJsonReleaseVersion).$(FileVersionRevision)</DotNetToolArgs>
 
     <BuildCommand>$(DotNetTool) pack $(NewtonsoftJsonProjectPath) /bl:$(ArtifactsLogRepoDir)build.binlog $(DotNetToolArgs)</BuildCommand>
 
diff --git a/tests/SbrpTests/ExternalPackageTests.cs b/tests/SbrpTests/ExternalPackageTests.cs
index ea24fb02fa..a491d205a8 100644
--- a/tests/SbrpTests/ExternalPackageTests.cs
+++ b/tests/SbrpTests/ExternalPackageTests.cs
@@ -7,6 +7,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using System.Xml.Linq;
+using NuGet.Packaging;
 using SbrpUtilities;
 using Xunit;
 using Xunit.Abstractions;
@@ -87,17 +88,18 @@ public void SourceRevisionIdMatchesSubmoduleCommit()
     /// <summary>
     /// Validates that the FileVersionRevision property in external package .proj files
     /// matches the actual FileVersion revision from the Microsoft-shipped NuGet package.
-    /// The test downloads the package specified by FileVersionValidationPackage using the
-    /// NuGet protocol API (honoring NuGet.config sources), extracts a DLL, reads its
-    /// FileVersion, and compares the revision component.
+    /// The test discovers the package ID from the component's build output directory
+    /// (artifacts/obj/{component}/), downloads the same package from NuGet, extracts a DLL,
+    /// reads its FileVersion, and compares the revision component.
     /// See https://github.com/dotnet/source-build/issues/5509
     /// </summary>
-    [Fact]
+    [SkippableFact]
     public async Task FileVersionRevisionMatchesPublishedPackage()
     {
         string repoRoot = PathUtilities.GetRepoRoot().TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
         string projectsDir = Path.Combine(repoRoot, "src", "externalPackages", "projects");
         string versionsPropsPath = Path.Combine(repoRoot, "eng", "Versions.props");
+        string artifactsObjDir = Path.Combine(repoRoot, "artifacts", "obj");
 
         string[] projFiles = Directory.GetFiles(projectsDir, "*.proj");
         Assert.True(projFiles.Length > 0, $"No .proj files found in {projectsDir}");
@@ -107,7 +109,7 @@ public async Task FileVersionRevisionMatchesPublishedPackage()
 
         foreach (string projFile in projFiles)
         {
-            string packageName = Path.GetFileNameWithoutExtension(projFile);
+            string componentName = Path.GetFileNameWithoutExtension(projFile);
             XDocument doc = XDocument.Load(projFile);
             string? fileVersionRevision = doc.Descendants("FileVersionRevision").FirstOrDefault()?.Value;
 
@@ -116,47 +118,134 @@ public async Task FileVersionRevisionMatchesPublishedPackage()
                 continue;
             }
 
-            string? validationPackage = doc.Descendants("FileVersionValidationPackage").FirstOrDefault()?.Value;
-            if (string.IsNullOrEmpty(validationPackage))
+            // Find matching release version in eng/Versions.props
+            string? releaseVersion = CommonUtilities.FindReleaseVersion(versionsPropsPath, componentName);
+
+            if (string.IsNullOrEmpty(releaseVersion))
             {
-                errors.Add($"{packageName}.proj: Has FileVersionRevision but no FileVersionValidationPackage property.");
+                errors.Add($"{componentName}.proj: No matching release version property found in eng/Versions.props.");
                 checkedCount++;
                 continue;
             }
 
-            // Find matching release version in eng/Versions.props
-            string? releaseVersion = CommonUtilities.FindReleaseVersion(versionsPropsPath, packageName);
+            // Find a .nupkg produced by this specific component
+            string componentObjDir = Path.Combine(artifactsObjDir, componentName);
+            if (!Directory.Exists(componentObjDir))
+            {
+                Output.WriteLine($"Skipping {componentName}: build output directory not found ({componentObjDir}).");
+                continue;
+            }
 
-            if (string.IsNullOrEmpty(releaseVersion))
+            string[] componentNupkgs = Directory.GetFiles(componentObjDir, "*.nupkg", SearchOption.AllDirectories);
+
+            // Find the first package that contains a DLL so we can read its FileVersion
+            string? packageId = null;
+            foreach (string nupkg in componentNupkgs)
             {
-                errors.Add($"{packageName}.proj: No matching release version property found in eng/Versions.props.");
-                checkedCount++;
+                using PackageArchiveReader reader = new(nupkg);
+                bool hasDll = reader.GetLibItems()
+                    .SelectMany(group => group.Items)
+                    .Any(item => item.EndsWith(".dll", StringComparison.OrdinalIgnoreCase));
+                if (hasDll)
+                {
+                    packageId = reader.NuspecReader.GetId();
+                    break;
+                }
+            }
+
+            if (packageId is null)
+            {
+                Output.WriteLine($"Skipping {componentName}: no .nupkg with a DLL found in build output.");
                 continue;
             }
 
-            // Download the package and read the FileVersion revision
+            // Download the published package and read the FileVersion revision
             var (revision, fileVersion) = await CommonUtilities.GetFileVersionRevisionAsync(
-                repoRoot, validationPackage, releaseVersion);
+                repoRoot, packageId, releaseVersion);
 
             if (revision is null)
             {
-                errors.Add($"{packageName}.proj: Unable to download {validationPackage} {releaseVersion} to validate FileVersionRevision.");
+                errors.Add($"{componentName}.proj: Unable to download {packageId} {releaseVersion} to validate FileVersionRevision.");
                 checkedCount++;
                 continue;
             }
 
             if (!int.TryParse(fileVersionRevision, out int expectedRevision) || expectedRevision != revision.Value)
             {
-                errors.Add($"{packageName}.proj: FileVersionRevision '{fileVersionRevision}' does not match " +
-                    $"actual revision '{revision}' from {validationPackage} {releaseVersion} " +
+                errors.Add($"{componentName}.proj: FileVersionRevision '{fileVersionRevision}' does not match " +
+                    $"actual revision '{revision}' from {packageId} {releaseVersion} " +
                     $"(FileVersion: {fileVersion}).");
             }
 
             checkedCount++;
         }
 
-        Assert.True(checkedCount > 0, "No external packages with FileVersionRevision were found to validate.");
+        Skip.If(checkedCount == 0, "No components with FileVersionRevision had build output to validate.");
         Assert.True(errors.Count == 0,
             $"FileVersionRevision validation failed:{Environment.NewLine}{string.Join(Environment.NewLine, errors)}");
     }
+
+    /// <summary>
+    /// Validates that the release version configured in eng/Versions.props for each external
+    /// component matches the version of at least one NuGet package produced by that component.
+    /// The test scans each component's build output directory (artifacts/obj/{component}/) for
+    /// .nupkg files and verifies at least one has the expected version.
+    /// This catches cases where a submodule is updated but the release version is not.
+    /// </summary>
+    [SkippableFact]
+    public void ReleaseVersionMatchesPackageOutput()
+    {
+        string repoRoot = PathUtilities.GetRepoRoot().TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+        string projectsDir = Path.Combine(repoRoot, "src", "externalPackages", "projects");
+        string versionsPropsPath = Path.Combine(repoRoot, "eng", "Versions.props");
+        string artifactsObjDir = Path.Combine(repoRoot, "artifacts", "obj");
+
+        string[] projFiles = Directory.GetFiles(projectsDir, "*.proj");
+        Assert.True(projFiles.Length > 0, $"No .proj files found in {projectsDir}");
+
+        List<string> errors = new();
+        int checkedCount = 0;
+
+        foreach (string projFile in projFiles)
+        {
+            string componentName = Path.GetFileNameWithoutExtension(projFile);
+            string? releaseVersion = CommonUtilities.FindReleaseVersion(versionsPropsPath, componentName);
+
+            if (string.IsNullOrEmpty(releaseVersion))
+            {
+                continue;
+            }
+
+            // Scan the component's own build output directory for .nupkg files
+            string componentObjDir = Path.Combine(artifactsObjDir, componentName);
+            if (!Directory.Exists(componentObjDir))
+            {
+                Output.WriteLine($"Skipping {componentName}: build output directory not found ({componentObjDir}).");
+                continue;
+            }
+
+            string[] componentNupkgs = Directory.GetFiles(componentObjDir, "*.nupkg", SearchOption.AllDirectories);
+            if (componentNupkgs.Length == 0)
+            {
+                Output.WriteLine($"Skipping {componentName}: no .nupkg files found in build output.");
+                continue;
+            }
+
+            string versionSuffix = $".{releaseVersion}.nupkg";
+            bool foundMatch = componentNupkgs.Any(f =>
+                Path.GetFileName(f).EndsWith(versionSuffix, StringComparison.OrdinalIgnoreCase));
+
+            if (!foundMatch)
+            {
+                string foundPackages = string.Join(", ", componentNupkgs.Select(Path.GetFileName));
+                errors.Add($"{componentName}: Expected package version {releaseVersion} but found: {foundPackages}");
+            }
+
+            checkedCount++;
+        }
+
+        Skip.If(checkedCount == 0, "No components with release versions had build output to validate.");
+        Assert.True(errors.Count == 0,
+            $"Release version validation failed:{Environment.NewLine}{string.Join(Environment.NewLine, errors)}");
+    }
 }