diff --git a/eng/Version.Details.props b/eng/Version.Details.props
index 2f13d40aa3..f9efc5d2bc 100644
--- a/eng/Version.Details.props
+++ b/eng/Version.Details.props
@@ -11,7 +11,6 @@ This file should be imported by eng/Versions.props
     <MicrosoftDiagnosticsNETCoreClientPackageVersion>0.2.0-preview.25476.104</MicrosoftDiagnosticsNETCoreClientPackageVersion>
     <!-- dotnet/runtime dependencies -->
     <MicrosoftExtensionsDependencyModelPackageVersion>6.0.2</MicrosoftExtensionsDependencyModelPackageVersion>
-    <SystemComponentModelCompositionPackageVersion>4.5.0</SystemComponentModelCompositionPackageVersion>
     <!-- dotnet/core-setup dependencies -->
     <MicrosoftExtensionsFileSystemGlobbingPackageVersion>2.0.0</MicrosoftExtensionsFileSystemGlobbingPackageVersion>
     <!-- dotnet/arcade dependencies -->
@@ -28,7 +27,6 @@ This file should be imported by eng/Versions.props
     <MicrosoftDiagnosticsNETCoreClientVersion>$(MicrosoftDiagnosticsNETCoreClientPackageVersion)</MicrosoftDiagnosticsNETCoreClientVersion>
     <!-- dotnet/runtime dependencies -->
     <MicrosoftExtensionsDependencyModelVersion>$(MicrosoftExtensionsDependencyModelPackageVersion)</MicrosoftExtensionsDependencyModelVersion>
-    <SystemComponentModelCompositionVersion>$(SystemComponentModelCompositionPackageVersion)</SystemComponentModelCompositionVersion>
     <!-- dotnet/core-setup dependencies -->
     <MicrosoftExtensionsFileSystemGlobbingVersion>$(MicrosoftExtensionsFileSystemGlobbingPackageVersion)</MicrosoftExtensionsFileSystemGlobbingVersion>
     <!-- dotnet/arcade dependencies -->
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 356337cc87..f4725005dd 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -11,11 +11,6 @@
       <Sha>e1eaf1bbd9702e9b6ee9b10dbc94105732e07896</Sha>
     </Dependency>
     <!-- Necessary for source-build. This allows the live version of the package to be used by source-build. -->
-    <Dependency Name="System.ComponentModel.Composition" Version="4.5.0">
-      <Uri>https://github.com/dotnet/runtime</Uri>
-      <Sha>30ab651fcb4354552bd4891619a0bdd81e0ebdbf</Sha>
-    </Dependency>
-    <!-- Necessary for source-build. This allows the live version of the package to be used by source-build. -->
     <Dependency Name="Microsoft.Extensions.DependencyModel" Version="6.0.2">
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>7d57652f33493fa022125b7f63aad0d70c52d810</Sha>
diff --git a/eng/verify-nupkgs.ps1 b/eng/verify-nupkgs.ps1
index 7ab1963a02..159b53fadb 100644
--- a/eng/verify-nupkgs.ps1
+++ b/eng/verify-nupkgs.ps1
@@ -19,10 +19,10 @@ function Verify-Nuget-Packages {
     $expectedNumOfFiles = @{
         "Microsoft.CodeCoverage"                      = 75
         "Microsoft.NET.Test.Sdk"                      = 25
-        "Microsoft.TestPlatform"                      = 538
+        "Microsoft.TestPlatform"                      = 537
         "Microsoft.VisualStudio.TestTools.TestPlatform.V2.CLI" = 380
         "Microsoft.TestPlatform.Build"                = 20
-        "Microsoft.TestPlatform.CLI"                  = 481
+        "Microsoft.TestPlatform.CLI"                  = 480
         "Microsoft.TestPlatform.Extensions.TrxLogger" = 34
         "Microsoft.TestPlatform.ObjectModel"          = 92
         "Microsoft.TestPlatform.AdapterUtilities"     = 61
diff --git a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.csproj b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.csproj
index d07e188d4d..76c7558869 100644
--- a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.csproj
+++ b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.csproj
@@ -77,7 +77,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.ComponentModel.Composition" Version="$(SystemComponentModelCompositionVersion)" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.CodeCoverage.IO" Version="$(MicrosoftCodeCoverageIOVersion)" GeneratePathProperty="true" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="$(MicrosoftExtensionsDependencyModelPackageVersion)" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" Version="$(MicrosoftExtensionsFileSystemGlobbingVersion)" GeneratePathProperty="true" />
@@ -93,7 +92,6 @@
       <MicrosoftExtensionsFileSystemGlobbing Include="$(PkgMicrosoft_Extensions_FileSystemGlobbing)\lib\netstandard2.0\*"></MicrosoftExtensionsFileSystemGlobbing>
       <NewtonsoftJson Include="$(PkgNewtonsoft_Json)\lib\netstandard2.0\*"></NewtonsoftJson>
       <MicrosoftInternalDia Include="$(PkgMicrosoft_Internal_Dia)\tools\netstandard\**\*"></MicrosoftInternalDia>
-      <SystemComponentModelComposition Include="$(PkgSystem_ComponentModel_Composition)\lib\netstandard2.0\**\*"></SystemComponentModelComposition>
       <MicrosoftDiagnosticsNETCoreClient Include="$(PkgMicrosoft_Diagnostics_NETCore_Client)\lib\netstandard2.0\**\*"></MicrosoftDiagnosticsNETCoreClient>
       <MicrosoftInternalDia Include="$(PkgMicrosoft_Internal_Dia)\tools\net451\**\*"></MicrosoftInternalDia>
     </ItemGroup>
@@ -102,7 +100,6 @@
     <Copy SourceFiles="@(MicrosoftExtensionsDependencyModel)" DestinationFiles="$(OutDir)\Microsoft.Extensions.DependencyModel\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(MicrosoftExtensionsFileSystemGlobbing)" DestinationFiles="$(OutDir)\Microsoft.Extensions.FileSystemGlobbing\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(NewtonsoftJson)" DestinationFiles="$(OutDir)\Newtonsoft.Json\%(RecursiveDir)%(Filename)%(Extension)" />
-    <Copy SourceFiles="@(SystemComponentModelComposition)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(MicrosoftDiagnosticsNETCoreClient)" DestinationFiles="$(OutDir)\Microsoft.Diagnostics.NETCore.Client\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(MicrosoftInternalDia)" DestinationFiles="$(OutDir)\Microsoft.Internal.Dia\%(RecursiveDir)%(Filename)%(Extension)" />
   </Target>
diff --git a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.nuspec b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.nuspec
index 905e3042f3..761967bbbd 100644
--- a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.nuspec
+++ b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.nuspec
@@ -33,7 +33,6 @@
     <file src="net9.0\Microsoft.VisualStudio.TestPlatform.ObjectModel.dll" target="contentFiles\any\net9.0" />
 
     <file src="net9.0\Newtonsoft.Json\Newtonsoft.Json.dll" target="contentFiles\any\net9.0" />
-    <file src="net9.0\System.ComponentModel.Composition.dll" target="contentFiles\any\net9.0" />
 
     <file src="$TesthostRuntimeconfig$\testhost-1.0.runtimeconfig.json" target="contentFiles\any\net9.0" />
     <file src="$TesthostRuntimeconfig$\testhost-1.1.runtimeconfig.json" target="contentFiles\any\net9.0" />
@@ -130,7 +129,7 @@
 
     <file src="net462\Newtonsoft.Json.dll" target="contentFiles\any\net9.0\TestHostNetFramework" />
 
-    <file src="net462\System*.dll" exclude="net462\System.ComponentModel.Composition.dll;net462\System.Threading.Tasks.Extensions.dll;net462\System.Diagnostics.DiagnosticSource.dll;net462\System.Text.Json.dll;net462\System.Text.Encodings.Web.dll;net462\System.IO.Pipelines.dll" target="contentFiles\any\net9.0\TestHostNetFramework" />
+    <file src="net462\System*.dll" exclude="net462\System.Threading.Tasks.Extensions.dll;net462\System.Diagnostics.DiagnosticSource.dll;net462\System.Text.Json.dll;net462\System.Text.Encodings.Web.dll;net462\System.IO.Pipelines.dll" target="contentFiles\any\net9.0\TestHostNetFramework" />
     <file src="net462\netstandard.dll" target="contentFiles\any\net9.0\TestHostNetFramework" />
     <file src="net462\Microsoft.Win32.Primitives.dll" target="contentFiles\any\net9.0\TestHostNetFramework" />
 
diff --git a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.nuspec b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.nuspec
index fe469909cf..fbd81347b6 100644
--- a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.nuspec
+++ b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.nuspec
@@ -48,8 +48,6 @@
 
     <file src="$SourceBuildTfmPrevious$\Newtonsoft.Json\Newtonsoft.Json.dll" target="contentFiles\any\$SourceBuildTfmPrevious$" />
     <file src="$SourceBuildTfmCurrent$\Newtonsoft.Json\Newtonsoft.Json.dll" target="contentFiles\any\$SourceBuildTfmCurrent$" />
-    <file src="$SourceBuildTfmPrevious$\System.ComponentModel.Composition.dll" target="contentFiles\any\$SourceBuildTfmPrevious$" />
-    <file src="$SourceBuildTfmCurrent$\System.ComponentModel.Composition.dll" target="contentFiles\any\$SourceBuildTfmCurrent$" />
 
     <file src="$TesthostRuntimeconfig$\testhost-1.0.runtimeconfig.json" target="contentFiles\any\$SourceBuildTfmPrevious$" />
     <file src="$TesthostRuntimeconfig$\testhost-1.0.runtimeconfig.json" target="contentFiles\any\$SourceBuildTfmCurrent$" />
diff --git a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.product.nuspec b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.product.nuspec
index 9a3222b6d0..5c0627e9ce 100644
--- a/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.product.nuspec
+++ b/src/package/Microsoft.TestPlatform.CLI/Microsoft.TestPlatform.CLI.sourcebuild.product.nuspec
@@ -32,7 +32,6 @@
     <file src="$SourceBuildTfmCurrent$\Microsoft.VisualStudio.TestPlatform.ObjectModel.dll" target="contentFiles\any\$SourceBuildTfmCurrent$" />
 
     <file src="$SourceBuildTfmCurrent$\Newtonsoft.Json\Newtonsoft.Json.dll" target="contentFiles\any\$SourceBuildTfmCurrent$" />
-    <file src="$SourceBuildTfmCurrent$\System.ComponentModel.Composition.dll" target="contentFiles\any\$SourceBuildTfmCurrent$" />
 
     <file src="$TesthostRuntimeconfig$\testhost-1.0.runtimeconfig.json" target="contentFiles\any\$SourceBuildTfmCurrent$" />
     <file src="$TesthostRuntimeconfig$\testhost-1.1.runtimeconfig.json" target="contentFiles\any\$SourceBuildTfmCurrent$" />
diff --git a/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.csproj b/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.csproj
index 5158174729..e04dc770cf 100644
--- a/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.csproj
+++ b/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.csproj
@@ -76,7 +76,6 @@
     which is most likely higher than what is the minimum supported .NET Framework.
   -->
   <ItemGroup Condition=" $([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', '$(NetFrameworkRunnerTargetFramework)')) ">
-    <PackageReference Include="System.ComponentModel.Composition" Version="$(SystemComponentModelCompositionVersion)" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.CodeCoverage.IO" Version="$(MicrosoftCodeCoverageIOVersion)" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="$(MicrosoftExtensionsDependencyModelPackageVersion)" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" Version="$(MicrosoftExtensionsFileSystemGlobbingVersion)" GeneratePathProperty="true" />
@@ -108,7 +107,6 @@
       <PackageDepsJsonFiles Include="..\..\Microsoft.TestPlatform.PlatformAbstractions\bin\$(Configuration)\$(TargetFramework)\*.deps.json"></PackageDepsJsonFiles>
       <NewtonsoftJsonFiles Include="$(PkgNewtonsoft_Json)\lib\netstandard2.0\*"></NewtonsoftJsonFiles>
       <SystemCollectionsImmutableFiles Include="$(PkgSystem_Collections_Immutable)\lib\netstandard2.0\*"></SystemCollectionsImmutableFiles>
-      <SystemComponentModelComposition Include="$(PkgSystem_ComponentModel_Composition)\lib\netstandard2.0\**\*"></SystemComponentModelComposition>
       <SystemReflectionMetadataFiles Include="$(PkgSystem_Reflection_Metadata)\lib\netstandard2.0\*"></SystemReflectionMetadataFiles>
       <MicrosoftInternalDiaFiles Include="$(PkgMicrosoft_Internal_Dia)\tools\net451\**\*"></MicrosoftInternalDiaFiles>
       <MicrosoftInternalIntellitraceFiles Include="$(PkgMicrosoft_Internal_Intellitrace)\tools\net451\**\*"></MicrosoftInternalIntellitraceFiles>
@@ -129,7 +127,6 @@
     <Copy SourceFiles="@(PlatformAbstractionsDepsJsonFiles)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(NewtonsoftJsonFiles)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(SystemCollectionsImmutableFiles)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
-    <Copy SourceFiles="@(SystemComponentModelComposition)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(SystemReflectionMetadataFiles)" DestinationFiles="$(OutDir)\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(MicrosoftInternalDiaFiles)" DestinationFiles="$(OutDir)\Microsoft.Internal.Dia\%(RecursiveDir)%(Filename)%(Extension)" />
     <Copy SourceFiles="@(MicrosoftInternalIntellitraceFiles)" DestinationFiles="$(OutDir)\Microsoft.Internal.Intellitrace\%(RecursiveDir)%(Filename)%(Extension)" />
diff --git a/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.nuspec b/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.nuspec
index 92cab69a7b..f8c51f1489 100644
--- a/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.nuspec
+++ b/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.nuspec
@@ -405,7 +405,6 @@
     <file src="net48\Microsoft.Internal.TestPlatform.Extensions\Extensions\Cpp\Microsoft.VisualStudio.TestTools.CppUnitTestFramework.TestEngine.dll" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\Microsoft.VisualStudio.TestTools.CppUnitTestFramework.TestEngine.dll" />
     <file src="net48\Microsoft.Internal.TestPlatform.Extensions\Extensions\Cpp\Microsoft.VisualStudio.TestTools.CppUnitTestFramework.x64.dll" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\Microsoft.VisualStudio.TestTools.CppUnitTestFramework.x64.dll" />
     <file src="net48\Newtonsoft.Json.dll" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\Newtonsoft.Json.dll" />
-    <file src="net48\System.ComponentModel.Composition.dll" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\System.ComponentModel.Composition.dll" />
     <file src="$TesthostRuntimeconfig$\testhost-1.0.runtimeconfig.json" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\testhost-1.0.runtimeconfig.json" />
     <file src="$TesthostRuntimeconfig$\testhost-1.1.runtimeconfig.json" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\testhost-1.1.runtimeconfig.json" />
     <file src="$TesthostRuntimeconfig$\testhost-2.0.runtimeconfig.json" target="tools\net462\Common7\IDE\Extensions\TestPlatform\TestHostNet\testhost-2.0.runtimeconfig.json" />