diff --git a/eng/Versions.props b/eng/Versions.props
index 3438a89b00313..b006d304bfcca 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -81,7 +81,7 @@
     <SystemBuffersVersion>4.5.1</SystemBuffersVersion>
     <SystemCollectionsVersion>4.3.0</SystemCollectionsVersion>
     <SystemCollectionsConcurrentVersion>4.3.0</SystemCollectionsConcurrentVersion>
-    <SystemComponentModelAnnotationsVersion>4.7.0</SystemComponentModelAnnotationsVersion>
+    <SystemComponentModelAnnotationsVersion>5.0.0</SystemComponentModelAnnotationsVersion>
     <SystemDataSqlClientVersion>4.8.1</SystemDataSqlClientVersion>
     <SystemDiagnosticsContractsVersion>4.3.0</SystemDiagnosticsContractsVersion>
     <SystemDiagnosticsDebugVersion>4.3.0</SystemDiagnosticsDebugVersion>
diff --git a/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj b/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj
index bcf5ce56123e9..56e09a3300f20 100644
--- a/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj
+++ b/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj
@@ -10,14 +10,10 @@
     <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.Options\src\Microsoft.Extensions.Options.csproj" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETStandard'">
     <PackageReference Include="System.ComponentModel.Annotations" Version="$(SystemComponentModelAnnotationsVersion)" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">
-    <ProjectReference Include="$(LibrariesProjectRoot)System.ComponentModel.Annotations\src\System.ComponentModel.Annotations.csproj" />
-  </ItemGroup>
-
   <ItemGroup Condition="$(TargetFramework.StartsWith('net4'))">
     <Reference Include="System.ComponentModel.DataAnnotations" />
   </ItemGroup>
diff --git a/src/libraries/System.ComponentModel.Annotations/Directory.Build.props b/src/libraries/System.ComponentModel.Annotations/Directory.Build.props
index 4c4a6c680d76c..63f02a0f817ef 100644
--- a/src/libraries/System.ComponentModel.Annotations/Directory.Build.props
+++ b/src/libraries/System.ComponentModel.Annotations/Directory.Build.props
@@ -2,18 +2,5 @@
   <Import Project="..\Directory.Build.props" />
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
-    <PackageDescription>Provides attributes that are used to define metadata for objects used as data sources.
-
-Commonly Used Types:
-System.ComponentModel.DataAnnotations.ValidationResult
-System.ComponentModel.DataAnnotations.IValidatableObject
-System.ComponentModel.DataAnnotations.ValidationAttribute
-System.ComponentModel.DataAnnotations.RequiredAttribute
-System.ComponentModel.DataAnnotations.StringLengthAttribute
-System.ComponentModel.DataAnnotations.DisplayAttribute
-System.ComponentModel.DataAnnotations.RegularExpressionAttribute
-System.ComponentModel.DataAnnotations.DataTypeAttribute
-System.ComponentModel.DataAnnotations.RangeAttribute
-System.ComponentModel.DataAnnotations.KeyAttribute</PackageDescription>
   </PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/src/libraries/System.ComponentModel.Annotations/pkg/System.ComponentModel.Annotations.pkgproj b/src/libraries/System.ComponentModel.Annotations/pkg/System.ComponentModel.Annotations.pkgproj
deleted file mode 100644
index dd046a9850aac..0000000000000
--- a/src/libraries/System.ComponentModel.Annotations/pkg/System.ComponentModel.Annotations.pkgproj
+++ /dev/null
@@ -1,29 +0,0 @@
-<Project DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))" />
-  <ItemGroup>
-    <ProjectReference Include="..\ref\System.ComponentModel.Annotations.csproj">
-      <SupportedFramework>netcoreapp3.0;$(AllXamarinFrameworks)</SupportedFramework>
-    </ProjectReference>
-    <ProjectReference Include="..\src\System.ComponentModel.Annotations.csproj" />
-    <HarvestIncludePaths Include="ref/netcore50;lib/netcore50" />
-    <HarvestIncludePaths Include="ref/netstandard1.1" />
-    <HarvestIncludePaths Include="ref/netstandard1.3" />
-    <HarvestIncludePaths Include="ref/netstandard1.4;lib/netstandard1.4" />
-    <HarvestIncludePaths Include="ref/netstandard2.0;lib/netstandard2.0" />
-    <HarvestIncludePaths Include="ref/net461;lib/net461" />
-    <InboxOnTargetFramework Include="$(AllXamarinFrameworks)" />
-    <InboxOnTargetFramework Include="net45">
-      <FrameworkReference>System.ComponentModel.DataAnnotations</FrameworkReference>
-    </InboxOnTargetFramework>
-    <InboxOnTargetFramework Include="win8" />
-    <InboxOnTargetFramework Include="portable-net45+win8" />
-    <ValidatePackageSuppression Include="PermitMissingImplementation">
-      <!-- Supported inbox by all ns1.1-1.3 frameworks -->
-      <Value>.NETStandard,Version=v1.1;.NETStandard,Version=v1.2;.NETStandard,Version=v1.3</Value>
-    </ValidatePackageSuppression>
-    <ValidatePackageSuppression Include="TreatAsOutOfBox">
-      <Value>.NETCoreApp;UAP</Value>
-    </ValidatePackageSuppression>
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets))" />
-</Project>
\ No newline at end of file
diff --git a/src/libraries/System.ComponentModel.Annotations/ref/System.ComponentModel.Annotations.csproj b/src/libraries/System.ComponentModel.Annotations/ref/System.ComponentModel.Annotations.csproj
index 0f88fe44694e2..2267869cc4b98 100644
--- a/src/libraries/System.ComponentModel.Annotations/ref/System.ComponentModel.Annotations.csproj
+++ b/src/libraries/System.ComponentModel.Annotations/ref/System.ComponentModel.Annotations.csproj
@@ -1,12 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
     <Nullable>enable</Nullable>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System.ComponentModel.Annotations.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+  <ItemGroup>
+    <ProjectReference Include="$(LibrariesProjectRoot)System.ComponentModel\ref\System.ComponentModel.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.ComponentModel.TypeConverter\ref\System.ComponentModel.TypeConverter.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\ref\System.Runtime.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/src/libraries/System.ComponentModel.Annotations/src/System.ComponentModel.Annotations.csproj b/src/libraries/System.ComponentModel.Annotations/src/System.ComponentModel.Annotations.csproj
index bc9a4134bad68..9c9dfebee9acc 100644
--- a/src/libraries/System.ComponentModel.Annotations/src/System.ComponentModel.Annotations.csproj
+++ b/src/libraries/System.ComponentModel.Annotations/src/System.ComponentModel.Annotations.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent);netstandard2.1</TargetFrameworks>
-    <ExcludeCurrentNetCoreAppFromPackage>true</ExcludeCurrentNetCoreAppFromPackage>
+    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
     <Nullable>enable</Nullable>
     <!--
       Since many resource strings in this library are shown to an end-user,
@@ -60,13 +59,7 @@
     <Compile Include="$(CommonPath)System\NotImplemented.cs"
              Link="Common\System\NotImplemented.cs" />
   </ItemGroup>
-  <ItemGroup Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) != '.NETCoreApp'">
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
-    <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
-  </ItemGroup>
-  <ItemGroup Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETCoreApp'">
+  <ItemGroup>
     <Reference Include="System.Collections" />
     <Reference Include="System.Collections.Concurrent" />
     <Reference Include="System.ComponentModel" />
diff --git a/src/libraries/pkg/baseline/packageIndex.json b/src/libraries/pkg/baseline/packageIndex.json
index 23d23bb500793..40018a9aec9e0 100644
--- a/src/libraries/pkg/baseline/packageIndex.json
+++ b/src/libraries/pkg/baseline/packageIndex.json
@@ -2030,7 +2030,7 @@
         "4.6.0",
         "5.0.0"
       ],
-      "BaselineVersion": "6.0.0",
+      "BaselineVersion": "5.0.0",
       "InboxOn": {
         "netcoreapp2.0": "4.2.0.0",
         "netcoreapp2.1": "4.2.1.0",
@@ -2059,8 +2059,7 @@
         "4.2.0.0": "4.4.0",
         "4.2.1.0": "4.5.0",
         "4.3.0.0": "4.6.0",
-        "5.0.0.0": "5.0.0",
-        "6.0.0.0": "6.0.0"
+        "5.0.0.0": "5.0.0"
       }
     },
     "System.ComponentModel.Composition": {