diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 57490a0e5..0cfcc2ef2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,7 +6,7 @@ on:
   pull_request:
 
 env:
-  DOTNET_VERSION: 5.0.100
+  DOTNET_VERSION: 6.0.x
 
 jobs:
 
@@ -21,8 +21,7 @@ jobs:
         dotnet-version: ${{ env.DOTNET_VERSION }}
     - name: Check format
       run: |
-        dotnet tool install --version 5.0.142902 --tool-path ./ dotnet-format --add-source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
-        ./dotnet-format . --check -v diagnostic
+        dotnet format --verify-no-changes --verbosity diagnostic
     - name: Add package coverlet.msbuild
       run: find tests -name *.csproj | xargs -I % dotnet add % package coverlet.msbuild
     - name: Test Neo.Compiler.CSharp.UnitTests
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index cdb3c9fdf..4d411ecd3 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -3,8 +3,8 @@
 
   <PropertyGroup>
     <Copyright>2015-2021 The Neo Project</Copyright>
-    <VersionPrefix>3.0.3</VersionPrefix>
-    <TargetFramework>net5.0</TargetFramework>
+    <VersionPrefix>3.1.0</VersionPrefix>
+    <TargetFramework>net6.0</TargetFramework>
     <Authors>The Neo Project</Authors>
   </PropertyGroup>
 
diff --git a/src/Neo.Compiler.CSharp/CompilationContext.cs b/src/Neo.Compiler.CSharp/CompilationContext.cs
index 44b538ba9..4ad5d2909 100644
--- a/src/Neo.Compiler.CSharp/CompilationContext.cs
+++ b/src/Neo.Compiler.CSharp/CompilationContext.cs
@@ -26,6 +26,7 @@
 using System.Reflection;
 using System.Text;
 using System.Xml.Linq;
+using Diagnostic = Microsoft.CodeAnalysis.Diagnostic;
 
 namespace Neo.Compiler
 {
diff --git a/src/Neo.Compiler.CSharp/Neo.Compiler.CSharp.csproj b/src/Neo.Compiler.CSharp/Neo.Compiler.CSharp.csproj
index eed891ac9..9e5b23743 100644
--- a/src/Neo.Compiler.CSharp/Neo.Compiler.CSharp.csproj
+++ b/src/Neo.Compiler.CSharp/Neo.Compiler.CSharp.csproj
@@ -20,7 +20,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.9.0" />
-    <PackageReference Include="Neo" Version="3.0.3" />
+    <PackageReference Include="Neo" Version="3.1.0" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.21308.1" />
   </ItemGroup>
 
diff --git a/src/Neo.SmartContract.Framework/OpCode.cs b/src/Neo.SmartContract.Framework/OpCode.cs
index 18521f142..a9c7f5022 100644
--- a/src/Neo.SmartContract.Framework/OpCode.cs
+++ b/src/Neo.SmartContract.Framework/OpCode.cs
@@ -689,6 +689,14 @@ public enum OpCode : byte
 
         #region Compound-type
 
+        /// <summary>
+        /// A value n is taken from top of main stack. The next n*2 items on main stack are removed, put inside n-sized map and this map is put on top of the main stack.
+        /// </summary>
+        PACKMAP = 0xBE,
+        /// <summary>
+        /// A value n is taken from top of main stack. The next n items on main stack are removed, put inside n-sized struct and this struct is put on top of the main stack.
+        /// </summary>
+        PACKSTRUCT = 0xBF,
         /// <summary>
         /// A value n is taken from top of main stack. The next n items on main stack are removed, put inside n-sized array and this array is put on top of the main stack.
         /// </summary>
diff --git a/src/Neo.SmartContract.Template/templates/neocontract/ProjectName.csproj b/src/Neo.SmartContract.Template/templates/neocontract/ProjectName.csproj
index fbb175a25..72925033c 100644
--- a/src/Neo.SmartContract.Template/templates/neocontract/ProjectName.csproj
+++ b/src/Neo.SmartContract.Template/templates/neocontract/ProjectName.csproj
@@ -1,11 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Neo.SmartContract.Framework" Version="3.0.3" />
+    <PackageReference Include="Neo.SmartContract.Framework" Version="3.1.0" />
   </ItemGroup>
 
   <Target Name="PostBuild" AfterTargets="PostBuildEvent">
diff --git a/tests/Neo.Compiler.CSharp.UnitTests/Neo.Compiler.CSharp.UnitTests.csproj b/tests/Neo.Compiler.CSharp.UnitTests/Neo.Compiler.CSharp.UnitTests.csproj
index 456126ffa..2602ee695 100644
--- a/tests/Neo.Compiler.CSharp.UnitTests/Neo.Compiler.CSharp.UnitTests.csproj
+++ b/tests/Neo.Compiler.CSharp.UnitTests/Neo.Compiler.CSharp.UnitTests.csproj
@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <IsPackable>false</IsPackable>
     <RootNamespace>Neo.Compiler.CSharp.UnitTests</RootNamespace>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
     <PackageReference Include="MSTest.TestFramework" Version="2.2.7" />
     <PackageReference Include="coverlet.collector" Version="3.1.0">
diff --git a/tests/Neo.Compiler.CSharp.UnitTests/Utils/TestEngine.cs b/tests/Neo.Compiler.CSharp.UnitTests/Utils/TestEngine.cs
index 465010944..65f72c9ad 100644
--- a/tests/Neo.Compiler.CSharp.UnitTests/Utils/TestEngine.cs
+++ b/tests/Neo.Compiler.CSharp.UnitTests/Utils/TestEngine.cs
@@ -44,8 +44,8 @@ static TestEngine()
             references.Add(cr.ToMetadataReference());
         }
 
-        public TestEngine(TriggerType trigger = TriggerType.Application, IVerifiable verificable = null, DataCache snapshot = null, Block persistingBlock = null)
-             : base(trigger, verificable, snapshot, persistingBlock, ProtocolSettings.Default, TestGas)
+        public TestEngine(TriggerType trigger = TriggerType.Application, IVerifiable verificable = null, DataCache snapshot = null, Block persistingBlock = null, SmartContract.Diagnostic diagnostic = null)
+             : base(trigger, verificable, snapshot, persistingBlock, ProtocolSettings.Default, TestGas, diagnostic)
         {
         }
 
diff --git a/tests/Neo.SmartContract.Framework.UnitTests/Neo.SmartContract.Framework.UnitTests.csproj b/tests/Neo.SmartContract.Framework.UnitTests/Neo.SmartContract.Framework.UnitTests.csproj
index 5e8ec1e3d..d9a78ca76 100644
--- a/tests/Neo.SmartContract.Framework.UnitTests/Neo.SmartContract.Framework.UnitTests.csproj
+++ b/tests/Neo.SmartContract.Framework.UnitTests/Neo.SmartContract.Framework.UnitTests.csproj
@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <IsPackable>false</IsPackable>
     <RootNamespace>Neo.SmartContract.Framework.UnitTests</RootNamespace>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="Moq" Version="4.16.1" />
   </ItemGroup>