EPPlusSoftware · JanKallman · Dec 12, 2025 · Dec 12, 2025 · Dec 12, 2025 · Dec 12, 2025
diff --git a/appveyor8.yml b/appveyor8.yml
@@ -1,20 +1,24 @@
-version: 8.3.1.{build}
+version: 8.4.0.{build}
 branches:
   only:
   - develop8
 configuration: release
 image: Visual Studio 2022
+install:
+- ps: |
+    Invoke-WebRequest -Uri 'https://dot.net/v1/dotnet-install.ps1' -UseBasicParsing -OutFile "$env:temp\dotnet-install.ps1"
+    & $env:temp\dotnet-install.ps1 -Architecture x64 -Version '10.0.100' -InstallDir "$env:ProgramFiles\dotnet"
 init:
 - ps: >-
-    Update-AppveyorBuild -Version "8.3.1.$env:appveyor_build_number-$(Get-Date -format yyyyMMdd)-$env:appveyor_repo_branch"
+    Update-AppveyorBuild -Version "8.4.0.$env:appveyor_build_number-$(Get-Date -format yyyyMMdd)-$env:appveyor_repo_branch"
 
-    Write-Host "8.3.1.$env:appveyor_build_number-$(Get-Date -format yyyyMMdd)-$env:appveyor_repo_branch"
+    Write-Host "8.4.0.$env:appveyor_build_number-$(Get-Date -format yyyyMMdd)-$env:appveyor_repo_branch"
 dotnet_csproj:
   patch: true
   file: '**\*.csproj'
   version: '{version}'
-  assembly_version: 8.3.1.{build}
-  file_version: 8.3.1.{build}
+  assembly_version: 8.4.0.{build}
+  file_version: 8.4.0.{build}
 nuget:
   project_feed: true
 before_build:

diff --git a/docs/articles/fixedissues.md b/docs/articles/fixedissues.md
@@ -1,4 +1,31 @@
 # Features / Fixed issues - EPPlus 8
+## Version 8.4.0
+### Features
+* Added targeting framework .NET 10.
+### Fixed issues 
+* Fixed an issue where the DATEDIF function returned incorrect results for the number of months.
+* Fixed an issue where EPPlus incorrectly evaluated the expression TRUE=1 as TRUE instead of FALSE.
+* Resolved various issues in CEILING, ISOCEILING, CEILING.PRECISE, CEILING.MATH and FLOOR, FLOOR.PRECISE, FLOOR.MATH functions, especially when handling negative multiples. 
+  The TIME function was previously limited to the range 00:00:00–23:59:59. It now behaves similar to Excel, supporting overflow and negative values.
+* Fixed an issue where the TIME function did not handle array input correctly.
+* Chart Style Manager reset the series color cycle when multiple chart types or a secondary axis were used.
+* Direct input of errors like #DIV/0!, #NAME?, #NULL! or #GETTING_DATA was not supported in formulas and arrays.
+* ISBLANK("") incorrectly returned true.
+* ERROR.TYPE returned a #VALUE! error when supplying a #DIV/0! error.
+* INDIRECT("") now returns a #REF! error.
+* CONCATENATE(TRUE,FALSE) now returns the bool-strings in upper case, as Excel.
+* REPT("ab",-1) now returns a #VALUE error.
+* Fixed several issues with the MOD function and negative arguments.
+* POWER(0,0) now returns a #NUM! error.
+* Added support for preserving conditional formatting in pivot tables placed in the <extLst> element.
+* The ISNUMBER now returns false on Boolean values.
+* The CHOOSE function incorrectly returned error (i.e. #DIV/0!), if supplies as conditional arguments.
+* The UNICHAR function did return the correct character.
+* The TEXT function failed, if a null value was supplied as format argument.
+* VLOOKUP could fail to find an item in the cell if the first row was the header. Excel ignores header values in the binary search.
+* `ExcelRangeBase.DimensionByValue` returned the wrong range in rare cases.
+* `ExcelRangeBase.Richtext` caused a null `NullReferenceException` when it hade been disposed.
+
 ## Version 8.3.1
 * Using an array as denominator when first value is 0 returns a single ´#DIV0!´ error.
 * The ´FILTER´ function did not work correctly when filtering on columns.

diff --git a/src/Directory.Build.props b/src/Directory.Build.props
@@ -20,6 +20,10 @@
     <DefineConstants>Core;NET90</DefineConstants>
   </PropertyGroup>
 
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net10.0'">
+    <DefineConstants>Core;NET100</DefineConstants>
+  </PropertyGroup>
+
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net481'">
     <DefineConstants>NET481;NETFULL</DefineConstants>
   </PropertyGroup>

diff --git a/src/EPPlus.Interfaces/EPPlus.Interfaces.csproj b/src/EPPlus.Interfaces/EPPlus.Interfaces.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
-		<TargetFrameworks>net9.0;net8.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
-		<AssemblyVersion>8.1.0.0</AssemblyVersion>
-		<FileVersion>8.1.0.0</FileVersion>
-		<Version>8.1.0</Version>
+		<TargetFrameworks>net10.0;net9.0;net8.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
+		<AssemblyVersion>8.4.0.0</AssemblyVersion>
+		<FileVersion>8.4.0.0</FileVersion>
+		<Version>8.4.0</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<PackageLicenseFile>license.md</PackageLicenseFile>
 		<RepositoryType>git</RepositoryType>

diff --git a/src/EPPlus.System.Drawing/EPPlus.System.Drawing.csproj b/src/EPPlus.System.Drawing/EPPlus.System.Drawing.csproj
@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net9.0;net8.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
-    <AssemblyVersion>8.1.0.0</AssemblyVersion>
-    <FileVersion>8.1.0.0</FileVersion>
-    <Version>8.1.0</Version>
+    <TargetFrameworks>net10.0;net9.0;net8.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
+    <AssemblyVersion>8.4.0.0</AssemblyVersion>
+    <FileVersion>8.4.0.0</FileVersion>
+    <Version>8.4.0</Version>
     <SignAssembly>true</SignAssembly>
     <PackageLicenseFile>license.md</PackageLicenseFile>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
@@ -19,12 +19,15 @@
     <ProjectReference Include="..\EPPlus.Interfaces\EPPlus.Interfaces.csproj" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' != 'net35' and '$(TargetFramework)' != 'net462' and '$(TargetFramework)' != 'net9.0'">
+  <ItemGroup Condition="'$(TargetFramework)' != 'net35' and '$(TargetFramework)' != 'net462' and '$(TargetFramework)' != 'net9.0' and '$(TargetFramework)' != 'net10.0'">
     <PackageReference Include="System.Drawing.Common" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
-	<PackageReference Include="System.Drawing.Common" VersionOverride="9.0.1" />
+	<PackageReference Include="System.Drawing.Common" VersionOverride="9.0.11" />
   </ItemGroup>
+	<ItemGroup Condition="'$(TargetFramework)' == 'net10.0'">
+		<PackageReference Include="System.Drawing.Common" VersionOverride="10.0.1" />
+	</ItemGroup>
 	<ItemGroup>
     <None Include="EPPlusLogo.png">
       <Pack>True</Pack>

diff --git a/src/EPPlus/EPPlus.csproj b/src/EPPlus/EPPlus.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
-		<TargetFrameworks>net8.0;net9.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
-		<AssemblyVersion>8.3.1.0</AssemblyVersion>
-		<FileVersion>8.3.1.0</FileVersion>
-		<Version>8.3.1</Version>
+		<TargetFrameworks>net8.0;net9.0;net10.0;netstandard2.1;netstandard2.0;net462;net35</TargetFrameworks>
+		<AssemblyVersion>8.4.0.0</AssemblyVersion>
+		<FileVersion>8.4.0.0</FileVersion>
+		<Version>8.4.0</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<PackageProjectUrl>https://epplussoftware.com</PackageProjectUrl>
 		<Authors>EPPlus Software AB</Authors>
@@ -18,17 +18,21 @@
 		<PackageReadmeFile>readme.md</PackageReadmeFile>
 		<Copyright>EPPlus Software AB</Copyright>
 		<PackageReleaseNotes>
-			EPPlus 8.3.1
+			EPPlus 8.4.0
 
 			IMPORTANT NOTICE!
 			From version 5 EPPlus changes the license model using a dual license, Polyform Non Commercial / Commercial license.
 			EPPlus will still have the source available, but for non Polyform NC compliant projects, EPPlus will provide a commercial license.
 			Commercial licenses can be purchased from https://epplussoftware.com
 			This applies to EPPlus version 5 and later. Earlier versions are still licensed LGPL.
 
-			## Version 8.3.1
+			## Version 8.4.0
+			* Added target framework .NET 10.
 			Minor bug fixes. See https://epplussoftware.com/Developers/MinorFeaturesAndIssues
-
+
+			## Version 8.3.1
+			Minor bug fixes.
+
 			## Version 8.3.0
 			* Support for adding, updating and removing external connections and query tables. See https://github.com/EPPlusSoftware/EPPlus/wiki/External-Connections-and-Query-Tables
 			* Support for adding pivot tables with external connections as data source.
@@ -541,6 +545,7 @@
 			A list of fixed issues can be found here https://epplussoftware.com/docs/7.0/articles/fixedissues.html
 
 			Version history
+			8.4.0			20251212 Updated target frameworks. Minor bug fixes.
 			8.3.1			20251128 Minor bug fixes.
 			8.3.0			20251120 Connections and query tables support. Minor features and bug fixes. See https://epplussoftware.com/Developers/MinorFeaturesAndIssues
 			8.2.1			20251012 Minor bug fixes.
@@ -744,8 +749,6 @@
 		<PackageReference Include="System.Text.Encoding.CodePages" VersionOverride="9.0.3" />
 		<PackageReference Include="System.Security.Cryptography.Xml" VersionOverride="9.0.3" />
 	</ItemGroup>
-	<!-- TargetFramework net10.0, remove when GitHub actions and AppVeyor support is available. -->
-	<!-- 
 	<ItemGroup Condition="'$(TargetFramework)' == 'net10.0'">
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" VersionOverride="10.0.0" />
 		<PackageReference Include="Microsoft.IO.RecyclableMemoryStream" />
@@ -754,7 +757,6 @@
 		<PackageReference Include="System.Text.Encoding.CodePages" VersionOverride="10.0.0" />
 		<PackageReference Include="System.Security.Cryptography.Xml" VersionOverride="10.0.0" />
 	</ItemGroup>
--->
 	<ItemGroup>
 		<Compile Remove="LoadFunctions\HeaderReader.cs" />
 	</ItemGroup>

diff --git a/src/EPPlus/EPPlusLicense.cs b/src/EPPlus/EPPlusLicense.cs
@@ -16,7 +16,7 @@ public class EPPlusLicense
     {
         private static ExcelPackageConfiguration _configuration = new ExcelPackageConfiguration();
         static bool _licenseSet = false;
-        internal const string _versionDate = "2025-08-15";
+        internal const string _versionDate = "2025-12-12";
         /// <summary>
         /// The license key used for a commercial license.
         /// </summary>