diff --git a/.github/workflows/ci-linux.yml b/.github/workflows/ci-linux.yml
index 9676614..d076d01 100644
--- a/.github/workflows/ci-linux.yml
+++ b/.github/workflows/ci-linux.yml
@@ -12,7 +12,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 3.1.x
+        dotnet-version: 8.0.x
     - name: Set version number
       run: .\version-number.ps1
       shell: pwsh
@@ -38,4 +38,4 @@ jobs:
       uses: actions/upload-artifact@v3
       with:
         name: Test log
-        path: src/ScmBackup.Tests.Integration/bin/Release/netcoreapp3.1/*.log
+        path: src/ScmBackup.Tests.Integration/bin/Release/net8.0/*.log
diff --git a/appveyor.yml b/appveyor.yml
index 3de6981..e57490e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,5 +1,5 @@
 version: "{build}"
-image: Visual Studio 2019
+image: Visual Studio 2022
 install:
 - ps: C:\projects\scm-backup\version-number.ps1
 build_script:
@@ -8,7 +8,7 @@ test: off
 artifacts:
 - path: release\scm-backup-*.zip
   name: Application
-- path: src\ScmBackup.Tests.Integration\bin\Release\netcoreapp3.1\*.log
+- path: src\ScmBackup.Tests.Integration\bin\Release\net8.0\*.log
   name: Integration Test Logfile
 assembly_info:
   patch: true
diff --git a/src/ScmBackup.Tests.Integration/DirectoryHelper.cs b/src/ScmBackup.Tests.Integration/DirectoryHelper.cs
index 0f19d21..c66eca6 100644
--- a/src/ScmBackup.Tests.Integration/DirectoryHelper.cs
+++ b/src/ScmBackup.Tests.Integration/DirectoryHelper.cs
@@ -41,7 +41,7 @@ public static string CreateTempDirectory(string suffix)
         /// </summary>
         public static string TestAssemblyDirectory()
         {
-            string unc = typeof(DirectoryHelper).GetTypeInfo().Assembly.CodeBase;
+            string unc = typeof(DirectoryHelper).GetTypeInfo().Assembly.Location;
 
             // convert from UNC path to "real" path
             var uri = new Uri(unc);
diff --git a/src/ScmBackup.Tests.Integration/ScmBackup.Tests.Integration.csproj b/src/ScmBackup.Tests.Integration/ScmBackup.Tests.Integration.csproj
index a3ed3a0..737fd12 100644
--- a/src/ScmBackup.Tests.Integration/ScmBackup.Tests.Integration.csproj
+++ b/src/ScmBackup.Tests.Integration/ScmBackup.Tests.Integration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>ScmBackup.Tests.Integration</AssemblyName>
     <PackageId>ScmBackup.Tests.Integration</PackageId>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
diff --git a/src/ScmBackup.Tests/ScmBackup.Tests.csproj b/src/ScmBackup.Tests/ScmBackup.Tests.csproj
index a1200f8..42fc8b1 100644
--- a/src/ScmBackup.Tests/ScmBackup.Tests.csproj
+++ b/src/ScmBackup.Tests/ScmBackup.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>ScmBackup.Tests</AssemblyName>
     <PackageId>ScmBackup.Tests</PackageId>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
diff --git a/src/ScmBackup/Http/MailKitEmailSender.cs b/src/ScmBackup/Http/MailKitEmailSender.cs
index 548a368..28681cf 100644
--- a/src/ScmBackup/Http/MailKitEmailSender.cs
+++ b/src/ScmBackup/Http/MailKitEmailSender.cs
@@ -22,10 +22,10 @@ public void Send(string subject, string body)
             }
 
             var message = new MimeMessage();
-            message.From.Add(new MailboxAddress(config.From));
+            message.From.Add(new MailboxAddress("", config.From));
             foreach (var to in config.To_AsList())
             {
-                message.To.Add(new MailboxAddress(to));
+                message.To.Add(new MailboxAddress("", to));
             }
             message.Subject = subject;
 
diff --git a/src/ScmBackup/ScmBackup.csproj b/src/ScmBackup/ScmBackup.csproj
index ba0ac95..ab2d312 100644
--- a/src/ScmBackup/ScmBackup.csproj
+++ b/src/ScmBackup/ScmBackup.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>ScmBackup</AssemblyName>
     <OutputType>Exe</OutputType>
     <PackageId>ScmBackup</PackageId>
@@ -26,12 +26,12 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MailKit" Version="2.5.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="NLog" Version="4.6.8" />
-    <PackageReference Include="Octokit" Version="0.36.0" />
-    <PackageReference Include="SimpleInjector" Version="4.9.0" />
-    <PackageReference Include="YamlDotNet" Version="8.1.0" />
+    <PackageReference Include="MailKit" Version="4.5.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="NLog" Version="5.2.8" />
+    <PackageReference Include="Octokit" Version="11.0.1" />
+    <PackageReference Include="SimpleInjector" Version="5.4.5" />
+    <PackageReference Include="YamlDotNet" Version="15.1.2" />
   </ItemGroup>
 
   <ItemGroup>