diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 0bc7c9d..5a64d4d 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -22,4 +22,4 @@ jobs:
     - name: Build
       run: dotnet build --no-restore Npoi.Mapper/Npoi.Mapper.sln
     - name: Test
-      run: dotnet test --no-build --verbosity normal Npoi.Mapper/Npoi.Mapper.sln
+      run: dotnet test --framework net6.0 --no-build --verbosity normal Npoi.Mapper/Npoi.Mapper.sln
diff --git a/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj b/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
index 7ddbfdb..8440304 100644
--- a/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
+++ b/Npoi.Mapper/src/Npoi.Mapper/Npoi.Mapper.csproj
@@ -5,14 +5,14 @@
     <Authors>Donny Tian</Authors>
     <AssemblyName>Npoi.Mapper</AssemblyName>
     <PackageId>Npoi.Mapper</PackageId>
-    <PackageTags>Excel;XLS;XLSX;NPOI;Object mapping;dynamic</PackageTags>
+    <PackageTags>Excel;XLS;XLSX;NPOI;object mapping;dynamic object mapping</PackageTags>
     <PackageProjectUrl>https://donnytian.github.io/Npoi.Mapper/</PackageProjectUrl>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-    <Version>6.0</Version>
-    <PackageReleaseNotes>Target on net6.0 only</PackageReleaseNotes>
+    <Version>6.1</Version>
+    <PackageReleaseNotes>Support net 472 and net60</PackageReleaseNotes>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>npoi.mapper.snk</AssemblyOriginatorKeyFile>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
     <LangVersion>default</LangVersion>
   </PropertyGroup>
 
@@ -30,7 +30,7 @@
   </PropertyGroup>
   
   <ItemGroup>
-    <PackageReference Include="NPOI" Version="2.6.0" />
+    <PackageReference Include="NPOI" Version="2.6.2" />
   </ItemGroup>
 
   <ItemGroup Label="SourceLink">
diff --git a/Npoi.Mapper/test/ExportGeneralTests.cs b/Npoi.Mapper/test/ExportGeneralTests.cs
index 4a4a440..a4724a0 100644
--- a/Npoi.Mapper/test/ExportGeneralTests.cs
+++ b/Npoi.Mapper/test/ExportGeneralTests.cs
@@ -2,7 +2,6 @@
 using System.IO;
 using System.Linq;
 using Npoi.Mapper;
-using NPOI.HSSF.UserModel;
 using NPOI.SS.UserModel;
 using NPOI.XSSF.UserModel;
 using NUnit.Framework;
diff --git a/Npoi.Mapper/test/Extensions.cs b/Npoi.Mapper/test/Extensions.cs
index e615d07..3206ca0 100644
--- a/Npoi.Mapper/test/Extensions.cs
+++ b/Npoi.Mapper/test/Extensions.cs
@@ -1,5 +1,4 @@
 using System;
-using NUnit.Framework;
 
 namespace test
 {
diff --git a/Npoi.Mapper/test/ImportDynamicTests.cs b/Npoi.Mapper/test/ImportDynamicTests.cs
index deff777..afcb2c4 100644
--- a/Npoi.Mapper/test/ImportDynamicTests.cs
+++ b/Npoi.Mapper/test/ImportDynamicTests.cs
@@ -1,9 +1,6 @@
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Npoi.Mapper;
 using NPOI.SS.UserModel;
 using NUnit.Framework;
@@ -275,7 +272,9 @@ public void TakeDynamic_TwoSheets_WithSameHeaderName()
             Assert.AreEqual(stringValue, objs1[0].Value.A);
             Assert.AreEqual(intValue, objs1[0].Value.sheet1B);
             Assert.AreEqual(doubleValue, objs2[0].Value.A);
-            Assert.AreEqual(dateTimeValue.ToOADate(), objs2[0].Value.sheet2B);
+            var diff = dateTimeValue.ToOADate() - objs2[0].Value.sheet2B;
+            const double epsilon = 0.0000000001;
+            Assert.IsTrue(Math.Abs(diff) <  epsilon);
         }
     }
 }
diff --git a/Npoi.Mapper/test/ImportGeneralTests.cs b/Npoi.Mapper/test/ImportGeneralTests.cs
index ff4edd5..7a8a948 100644
--- a/Npoi.Mapper/test/ImportGeneralTests.cs
+++ b/Npoi.Mapper/test/ImportGeneralTests.cs
@@ -3,7 +3,6 @@
 using System.Globalization;
 using System.IO;
 using System.Linq;
-using NPOI.HSSF.UserModel;
 using Npoi.Mapper;
 using Npoi.Mapper.Attributes;
 using NPOI.SS.UserModel;
diff --git a/Npoi.Mapper/test/TestSetUp.cs b/Npoi.Mapper/test/TestSetUp.cs
index a78489b..fa52b7c 100644
--- a/Npoi.Mapper/test/TestSetUp.cs
+++ b/Npoi.Mapper/test/TestSetUp.cs
@@ -1,9 +1,6 @@
 using System;
-using System.Diagnostics.CodeAnalysis;
 using NUnit.Framework;
 
-[assembly:ExcludeFromCodeCoverage]
-
 namespace test
 {
     /// <summary>
diff --git a/Npoi.Mapper/test/test.csproj b/Npoi.Mapper/test/test.csproj
index a39af85..8c19072 100644
--- a/Npoi.Mapper/test/test.csproj
+++ b/Npoi.Mapper/test/test.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
     <LangVersion>default</LangVersion>
   </PropertyGroup>
 
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0-preview-23424-02" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0">
       <PrivateAssets>all</PrivateAssets>
@@ -28,12 +28,7 @@
     <ProjectReference Include="..\src\Npoi.Mapper\Npoi.Mapper.csproj" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net45'">
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.ComponentModel.DataAnnotations" />
-  </ItemGroup>
-
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net40'">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472'">
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.ComponentModel.DataAnnotations" />
   </ItemGroup>
@@ -42,7 +37,7 @@
     <PackageReference Include="System.Reflection.Emit" Version="4.3.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.5.0" />
   </ItemGroup>
-
+  
   <ItemGroup>
     <None Update="Book1.xlsx">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>