diff --git a/Versions.props b/Versions.props
index d3ab9e9..2242e26 100644
--- a/Versions.props
+++ b/Versions.props
@@ -9,8 +9,8 @@
     <NerdbankGitVersioningVersion>3.6.133</NerdbankGitVersioningVersion>
     <NSubstituteVersion>5.0.0</NSubstituteVersion>
     <TunnelVisionLabsReferenceAssemblyAnnotatorVersion>1.0.0-alpha.160</TunnelVisionLabsReferenceAssemblyAnnotatorVersion>
-    <XunitAnalyzersVersion>1.4.0-pre.1</XunitAnalyzersVersion>
-    <XunitVersion>2.5.2-pre.4</XunitVersion>
+    <XunitAnalyzersVersion>1.4.0-pre.9</XunitAnalyzersVersion>
+    <XunitVersion>2.5.2-pre.6</XunitVersion>
   </PropertyGroup>
 
 </Project>
diff --git a/src/xunit.runner.visualstudio/Utility/AssemblyResolution/_DiagnosticMessage.cs b/src/xunit.runner.visualstudio/Utility/AssemblyResolution/_DiagnosticMessage.cs
index 4885036..d242b0d 100644
--- a/src/xunit.runner.visualstudio/Utility/AssemblyResolution/_DiagnosticMessage.cs
+++ b/src/xunit.runner.visualstudio/Utility/AssemblyResolution/_DiagnosticMessage.cs
@@ -1,8 +1,9 @@
 using Xunit.Abstractions;
+using Xunit.Sdk;
 
 namespace Xunit;
 
-class _DiagnosticMessage : IDiagnosticMessage
+class _DiagnosticMessage : LongLivedMarshalByRefObject, IDiagnosticMessage
 {
 	/// <summary>
 	/// Initializes a new instance of the <see cref="DiagnosticMessage"/> class.