diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 1e062867fae0..5794d7ea0681 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -185,9 +185,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>5d54b08d5fc40d0b1c156f430a487a94c1e34f79</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23329.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23368.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>ac076c101e6fe5e8fbfbd0a0ab878bd3313d9138</Sha>
+      <Sha>844e2cd86e7525d7eb32358e63a0c554187eb26b</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 c6f87d65fcc7..b005e112e16c 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -163,7 +163,7 @@
     <!-- Packages from dotnet/source-link -->
     <MicrosoftSourceLinkGitHubVersion>8.0.0-beta.23328.1</MicrosoftSourceLinkGitHubVersion>
     <!-- Packages from dotnet/source-build-externals -->
-    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23329.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23368.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>8.0.0-alpha.1.23356.4</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->
diff --git a/src/SignalR/clients/csharp/Client/test/FunctionalTests/Startup.cs b/src/SignalR/clients/csharp/Client/test/FunctionalTests/Startup.cs
index 91286fa5378d..b20a20325aa2 100644
--- a/src/SignalR/clients/csharp/Client/test/FunctionalTests/Startup.cs
+++ b/src/SignalR/clients/csharp/Client/test/FunctionalTests/Startup.cs
@@ -5,6 +5,7 @@
 using System.IdentityModel.Tokens.Jwt;
 using System.IO;
 using System.Security.Claims;
+using System.Security.Cryptography;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authentication.Negotiate;
 using Microsoft.AspNetCore.Authorization;
@@ -21,7 +22,7 @@ namespace Microsoft.AspNetCore.SignalR.Client.FunctionalTests;
 
 public class Startup
 {
-    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(Guid.NewGuid().ToByteArray());
+    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(SHA256.HashData(Guid.NewGuid().ToByteArray()));
     private readonly JwtSecurityTokenHandler JwtTokenHandler = new JwtSecurityTokenHandler();
 
     public void ConfigureServices(IServiceCollection services)
diff --git a/src/SignalR/clients/ts/FunctionalTests/Startup.cs b/src/SignalR/clients/ts/FunctionalTests/Startup.cs
index 9182753d6a2e..2dda5dc55538 100644
--- a/src/SignalR/clients/ts/FunctionalTests/Startup.cs
+++ b/src/SignalR/clients/ts/FunctionalTests/Startup.cs
@@ -5,6 +5,7 @@
 using System.IdentityModel.Tokens.Jwt;
 using System.Reflection;
 using System.Security.Claims;
+using System.Security.Cryptography;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Http.Connections;
@@ -19,7 +20,7 @@ namespace FunctionalTests;
 
 public class Startup
 {
-    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(Guid.NewGuid().ToByteArray());
+    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(SHA256.HashData(Guid.NewGuid().ToByteArray()));
     private readonly JwtSecurityTokenHandler JwtTokenHandler = new JwtSecurityTokenHandler();
 
     private int _numRedirects;
diff --git a/src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs b/src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs
index f083e9b6b897..d0ecdcf21560 100644
--- a/src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs
+++ b/src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs
@@ -10,6 +10,7 @@
 using System.Net.Http;
 using System.Net.WebSockets;
 using System.Security.Claims;
+using System.Security.Cryptography;
 using System.Security.Principal;
 using System.Text;
 using Microsoft.AspNetCore.Authentication;
@@ -2988,7 +2989,7 @@ public async Task ConnectionClosedRequestedTriggeredOnAuthExpiration()
     [InlineData(HttpTransportType.WebSockets)]
     public async Task AuthenticationExpirationSetOnAuthenticatedConnectionWithJWT(HttpTransportType transportType)
     {
-        SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(Guid.NewGuid().ToByteArray());
+        SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(SHA256.HashData(Guid.NewGuid().ToByteArray()));
         JwtSecurityTokenHandler JwtTokenHandler = new JwtSecurityTokenHandler();
 
         using var host = CreateHost(services =>
@@ -3150,7 +3151,7 @@ public async Task AuthenticationExpirationSetOnAuthenticatedConnectionWithCookie
     [InlineData(HttpTransportType.WebSockets)]
     public async Task AuthenticationExpirationUsesCorrectScheme(HttpTransportType transportType)
     {
-        var SecurityKey = new SymmetricSecurityKey(Guid.NewGuid().ToByteArray());
+        var SecurityKey = new SymmetricSecurityKey(SHA256.HashData(Guid.NewGuid().ToByteArray()));
         var JwtTokenHandler = new JwtSecurityTokenHandler();
 
         using var host = CreateHost(services =>
diff --git a/src/SignalR/samples/JwtSample/Startup.cs b/src/SignalR/samples/JwtSample/Startup.cs
index 18b1ae21ea35..cefde00a4cd0 100644
--- a/src/SignalR/samples/JwtSample/Startup.cs
+++ b/src/SignalR/samples/JwtSample/Startup.cs
@@ -11,7 +11,7 @@ namespace JwtSample;
 
 public class Startup
 {
-    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(RandomNumberGenerator.GetBytes(16));
+    private readonly SymmetricSecurityKey SecurityKey = new SymmetricSecurityKey(RandomNumberGenerator.GetBytes(32));
     private readonly JwtSecurityTokenHandler JwtTokenHandler = new JwtSecurityTokenHandler();
 
     public void ConfigureServices(IServiceCollection services)