diff --git a/Build/build.ps1 b/Build/build.ps1
index f3e8c80e..696e58ed 100644
--- a/Build/build.ps1
+++ b/Build/build.ps1
@@ -37,9 +37,7 @@
     @{Framework = "net45"; TestsFunction = "NUnitTests"; TestFramework = "net46"; NUnitFramework="net-4.0"; Enabled=$true},
     @{Framework = "net40"; TestsFunction = "NUnitTests"; NUnitFramework="net-4.0"; Enabled=$true},
     @{Framework = "net35"; TestsFunction = "NUnitTests"; NUnitFramework="net-2.0"; Enabled=$true},
-    @{Framework = "net20"; TestsFunction = "NUnitTests"; NUnitFramework="net-2.0"; Enabled=$true},
-    @{Framework = "portable-net45+win8+wpa81+wp8"; TestsFunction = "NUnitTests"; TestFramework = "net452"; NUnitFramework="net-4.0"; Enabled=$true},
-    @{Framework = "portable-net40+win8+wpa81+wp8+sl5"; TestsFunction = "NUnitTests"; TestFramework = "net451"; NUnitFramework="net-4.0"; Enabled=$true}
+    @{Framework = "net20"; TestsFunction = "NUnitTests"; NUnitFramework="net-2.0"; Enabled=$true}
   )
 }
 
diff --git a/Build/version.json b/Build/version.json
index 2b4a873f..dc86e02c 100644
--- a/Build/version.json
+++ b/Build/version.json
@@ -1,6 +1,6 @@
 {
-  "Major": 12,
-  "Release": 3,
-  "Prerelease": null,
+  "Major": 13,
+  "Release": 1,
+  "Prerelease": "beta1",
   "Assembly": null
 }
\ No newline at end of file
diff --git a/Src/Newtonsoft.Json.Tests/Newtonsoft.Json.Tests.csproj b/Src/Newtonsoft.Json.Tests/Newtonsoft.Json.Tests.csproj
index dbfb0923..cd4c9a39 100644
--- a/Src/Newtonsoft.Json.Tests/Newtonsoft.Json.Tests.csproj
+++ b/Src/Newtonsoft.Json.Tests/Newtonsoft.Json.Tests.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks Condition="'$(TestFrameworks)'==''">net46;net451;net452;net40;net35;net20;netcoreapp3.0;netcoreapp2.2;netcoreapp2.1</TargetFrameworks>
+    <TargetFrameworks Condition="'$(TestFrameworks)'==''">net46;net40;net35;net20;netcoreapp3.0;netcoreapp2.2;netcoreapp2.1</TargetFrameworks>
     <TargetFrameworks Condition="'$(TestFrameworks)'!=''">$(TestFrameworks)</TargetFrameworks>
     <LangVersion>8.0</LangVersion>
     <VersionPrefix>1.0</VersionPrefix>
@@ -65,52 +65,6 @@
     <DefineConstants>NET45;HAVE_BENCHMARKS;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
   
-  <ItemGroup Condition="'$(TargetFramework)'=='net451'">
-    <PackageReference Include="NUnit" Version="$(NunitPackageVersion)" />
-    <PackageReference Include="NUnit3TestAdapter" Version="$(Nunit3TestAdapterPackageVersion)" />
-    <PackageReference Include="Autofac" Version="$(AutofacPackageVersion)" />
-    <PackageReference Include="FSharp.Core" Version="$(FSharpCorePackageVersion)" />
-    <PackageReference Include="System.Buffers" Version="$(SystemBuffersPackageVersion)" />
-    <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutablePackageVersion)" />
-    <PackageReference Include="System.ValueTuple" Version="$(SystemValueTuplePackageVersion)" />
-    <PackageReference Include="Moq" Version="$(MoqPackageVersion)" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Web" />
-    <Reference Include="System.Data.Linq" />
-    <Reference Include="System.Data.Entity" />
-    <Reference Include="System.ComponentModel.DataAnnotations" />
-    <Reference Include="System.Web.Extensions" />
-    <Reference Include="System.Data.DataSetExtensions" />
-  </ItemGroup>
-  <PropertyGroup Condition="'$(TargetFramework)'=='net451'">
-    <AssemblyTitle>Json.NET Tests Portable .NET 4.0</AssemblyTitle>
-    <ReferringTargetFrameworkForProjectReferences>.NETPortable,Version=v0.0,Profile=Profile328</ReferringTargetFrameworkForProjectReferences>
-    <DefineConstants>PORTABLE40;$(AdditionalConstants)</DefineConstants>
-  </PropertyGroup>
-  
-  <ItemGroup Condition="'$(TargetFramework)'=='net452'">
-    <PackageReference Include="NUnit" Version="$(NunitPackageVersion)" />
-    <PackageReference Include="NUnit3TestAdapter" Version="$(Nunit3TestAdapterPackageVersion)" />
-    <PackageReference Include="Autofac" Version="$(AutofacPackageVersion)" />
-    <PackageReference Include="FSharp.Core" Version="$(FSharpCorePackageVersion)" />
-    <PackageReference Include="System.Buffers" Version="$(SystemBuffersPackageVersion)" />
-    <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutablePackageVersion)" />
-    <PackageReference Include="System.ValueTuple" Version="$(SystemValueTuplePackageVersion)" />
-    <PackageReference Include="Moq" Version="$(MoqPackageVersion)" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Web" />
-    <Reference Include="System.Data.Linq" />
-    <Reference Include="System.Data.Entity" />
-    <Reference Include="System.ComponentModel.DataAnnotations" />
-    <Reference Include="System.Web.Extensions" />
-    <Reference Include="System.Data.DataSetExtensions" />
-  </ItemGroup>
-  <PropertyGroup Condition="'$(TargetFramework)'=='net452'">
-    <AssemblyTitle>Json.NET Tests Portable</AssemblyTitle>
-    <ReferringTargetFrameworkForProjectReferences>.NETPortable,Version=v0.0,Profile=Profile259</ReferringTargetFrameworkForProjectReferences>
-    <DefineConstants>PORTABLE;$(AdditionalConstants)</DefineConstants>
-  </PropertyGroup>
-  
   <ItemGroup Condition="'$(TargetFramework)'=='net40'">
     <PackageReference Include="NUnit" Version="$(NunitPackageVersion)" />
     <PackageReference Include="NUnit3TestAdapter" Version="$(Nunit3TestAdapterPackageVersion)" />
diff --git a/Src/Newtonsoft.Json/Newtonsoft.Json.csproj b/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
index 65043c77..95dad1e4 100644
--- a/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
+++ b/Src/Newtonsoft.Json/Newtonsoft.Json.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks Condition="'$(LibraryFrameworks)'==''">net45;net40;net35;net20;netstandard1.0;netstandard1.3;netstandard2.0;portable-net45+win8+wpa81+wp8;portable-net40+win8+wpa81+wp8+sl5</TargetFrameworks>
+    <TargetFrameworks Condition="'$(LibraryFrameworks)'==''">net45;net40;net35;net20;netstandard1.0;netstandard1.3;netstandard2.0</TargetFrameworks>
     <TargetFrameworks Condition="'$(LibraryFrameworks)'!=''">$(LibraryFrameworks)</TargetFrameworks>
     <LangVersion>8.0</LangVersion>
     <!-- version numbers will be updated by build -->
@@ -80,22 +80,4 @@
     <AssemblyTitle>Json.NET .NET Standard 2.0</AssemblyTitle>
     <DefineConstants>NETSTANDARD2_0;HAVE_ADO_NET;HAVE_APP_DOMAIN;HAVE_ASYNC;HAVE_BIG_INTEGER;HAVE_BINARY_FORMATTER;HAVE_BINARY_SERIALIZATION;HAVE_BINARY_EXCEPTION_SERIALIZATION;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_CHAR_TO_STRING_WITH_CULTURE;HAVE_COM_ATTRIBUTES;HAVE_COMPONENT_MODEL;HAVE_CONCURRENT_COLLECTIONS;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_DYNAMIC;HAVE_EMPTY_TYPES;HAVE_ENTITY_FRAMEWORK;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_HASH_SET;HAVE_ICLONEABLE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_INOTIFY_PROPERTY_CHANGING;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_NON_SERIALIZED_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STREAM_READER_WRITER_CLOSE;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_TRACE_WRITER;HAVE_TYPE_DESCRIPTOR;HAVE_UNICODE_SURROGATE_DETECTION;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_XML_DOCUMENT;HAVE_XML_DOCUMENT_TYPE;HAVE_CONCURRENT_DICTIONARY;$(AdditionalConstants)</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(TargetFramework)' == 'portable-net40+win8+wpa81+wp8+sl5'">
-    <AssemblyTitle>Json.NET Portable .NET 4.0</AssemblyTitle>
-    <DefineConstants>PORTABLE40;HAVE_CHAR_TO_LOWER_WITH_CULTURE;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DB_NULL_TYPE_CODE;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_FULL_REFLECTION;HAVE_GUID_TRY_PARSE;HAVE_ICONVERTIBLE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_MEMORY_BARRIER;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;HAVE_SECURITY_SAFE_CRITICAL_ATTRIBUTE;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;$(AdditionalConstants)</DefineConstants>
-    <TargetFrameworkIdentifier>.NETPortable</TargetFrameworkIdentifier>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <TargetFrameworkProfile>Profile328</TargetFrameworkProfile>
-    <NugetTargetMoniker>.NETPortable,Version=v0.0,Profile=Profile328</NugetTargetMoniker>
-    <LanguageTargets>$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets</LanguageTargets>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(TargetFramework)' == 'portable-net45+win8+wpa81+wp8'">
-    <AssemblyTitle>Json.NET Portable</AssemblyTitle>
-    <DefineConstants>PORTABLE;HAVE_ASYNC;HAVE_COVARIANT_GENERICS;HAVE_DATA_CONTRACTS;HAVE_DATE_TIME_OFFSET;HAVE_DYNAMIC;HAVE_EXPRESSIONS;HAVE_FAST_REVERSE;HAVE_FSHARP_TYPES;HAVE_GUID_TRY_PARSE;HAVE_IGNORE_DATA_MEMBER_ATTRIBUTE;HAVE_ISET;HAVE_LINQ;HAVE_METHOD_IMPL_ATTRIBUTE;HAVE_READ_ONLY_COLLECTIONS;HAVE_REFLECTION_BINDER;HAVE_SERIALIZATION_BINDER_BIND_TO_NAME;HAVE_STRING_JOIN_WITH_ENUMERABLE;HAVE_TIME_SPAN_PARSE_WITH_CULTURE;HAVE_TIME_SPAN_TO_STRING_WITH_CULTURE;HAVE_TIME_ZONE_INFO;HAVE_VARIANT_TYPE_PARAMETERS;HAVE_VERSION_TRY_PARSE;HAVE_XLINQ;HAVE_INOTIFY_COLLECTION_CHANGED;HAVE_OBSOLETE_FORMATTER_ASSEMBLY_STYLE;$(AdditionalConstants)</DefineConstants>
-    <TargetFrameworkIdentifier>.NETPortable</TargetFrameworkIdentifier>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <TargetFrameworkProfile>Profile259</TargetFrameworkProfile>
-    <NugetTargetMoniker>.NETPortable,Version=v0.0,Profile=Profile259</NugetTargetMoniker>
-    <LanguageTargets>$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets</LanguageTargets>
-  </PropertyGroup>
 </Project>
\ No newline at end of file