diff --git a/.editorconfig b/.editorconfig
index 97fab23cf..96a60e23f 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -296,3 +296,7 @@ csharp_style_allow_blank_line_after_token_in_arrow_expression_clause_experimenta
 csharp_style_prefer_pattern_matching = true:silent
 csharp_style_prefer_not_pattern = true:suggestion
 csharp_style_prefer_extended_property_pattern = true:suggestion
+
+# WFO1000: A property should determine its property content serialization with the DesignerSerializationVisibilityAttribute, DefaultValueAttribute or the ShouldSerializeProperty method
+# Silent for now, see https://github.com/dotnet/winforms/issues/12476
+dotnet_diagnostic.WFO1000.severity = silent
\ No newline at end of file
diff --git a/eng/RepoLayout.props b/eng/RepoLayout.props
index 138de56b4..e70b835ed 100644
--- a/eng/RepoLayout.props
+++ b/eng/RepoLayout.props
@@ -9,8 +9,8 @@
     <!-- Set version for runtimeconfig.json, used by DotnetRuntimeBootstrapper for minimal version to support
          To be kept in sync with the .NET SDK version in global.json
     -->
-    <RuntimeFrameworkVersion>8.0.0</RuntimeFrameworkVersion>
-    <SolutionTargetFramework>net8.0-windows</SolutionTargetFramework>
+    <RuntimeFrameworkVersion>9.0.0</RuntimeFrameworkVersion>
+    <SolutionTargetFramework>net9.0-windows</SolutionTargetFramework>
     <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
     <Platform Condition="'$(Platform)' == ''">AnyCPU</Platform>
     <PlatformName Condition="'$(PlatformName)' == ''">$(Platform)</PlatformName>
diff --git a/eng/Update-DotnetVersion.ps1 b/eng/Update-DotnetVersion.ps1
index 9f0872f06..e3af34661 100644
--- a/eng/Update-DotnetVersion.ps1
+++ b/eng/Update-DotnetVersion.ps1
@@ -1,4 +1,4 @@
-param ( [string]$version = "8.0")
+param ( [string]$version = "9.0")
 
 $encoding = [System.Text.UTF8Encoding]::new($false)
 
diff --git a/externals/Git.hub b/externals/Git.hub
index 8b7e1cec4..1b0386aea 160000
--- a/externals/Git.hub
+++ b/externals/Git.hub
@@ -1 +1 @@
-Subproject commit 8b7e1cec4b4e87a45fd26f7cc8a56e3951f265a7
+Subproject commit 1b0386aea1acdd2ba258977bd79e40a0a7b95665
diff --git a/externals/ICSharpCode.TextEditor b/externals/ICSharpCode.TextEditor
index 1cb6d9c20..48f506b0f 160000
--- a/externals/ICSharpCode.TextEditor
+++ b/externals/ICSharpCode.TextEditor
@@ -1 +1 @@
-Subproject commit 1cb6d9c201324c9f521148ce9c9fb544e09f1b1a
+Subproject commit 48f506b0f1266d52f06e9236fe242753c7de9e17
diff --git a/externals/NetSpell.SpellChecker/SpellChecker.csproj b/externals/NetSpell.SpellChecker/SpellChecker.csproj
index 0573674d8..3576b9c82 100644
--- a/externals/NetSpell.SpellChecker/SpellChecker.csproj
+++ b/externals/NetSpell.SpellChecker/SpellChecker.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0-windows</TargetFramework>
+    <TargetFramework>net9.0-windows</TargetFramework>
     <UseWindowsForms>true</UseWindowsForms>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
diff --git a/externals/conemu-inside b/externals/conemu-inside
index c0b721fc0..12f5d0695 160000
--- a/externals/conemu-inside
+++ b/externals/conemu-inside
@@ -1 +1 @@
-Subproject commit c0b721fc0eb9fbdbcb5a26d6612690b5222ce569
+Subproject commit 12f5d069560d028fd969f49ce4e7d1a19ab35380
diff --git a/global.json b/global.json
index 5c762277a..7ade5ab4c 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
     "sdk": {
-        "version": "8.0.0",
+        "version": "9.0",
         "rollForward": "feature"
     }
 }
diff --git a/src/app/GitUI/CommandsDialogs/FormFormatPatch.cs b/src/app/GitUI/CommandsDialogs/FormFormatPatch.cs
index 2a0162c75..2e303ec40 100644
--- a/src/app/GitUI/CommandsDialogs/FormFormatPatch.cs
+++ b/src/app/GitUI/CommandsDialogs/FormFormatPatch.cs
@@ -225,7 +225,9 @@ namespace GitUI.CommandsDialogs
                         : CredentialCache.DefaultNetworkCredentials;
                 }
 
+#pragma warning disable SYSLIB0014 // Type or member is obsolete
                 ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
+#pragma warning restore SYSLIB0014 // Type or member is obsolete
 
                 smtpClient.Send(mail);
             }
diff --git a/src/app/GitUI/GitUI.csproj b/src/app/GitUI/GitUI.csproj
index ebbd3c20e..b2f43576d 100644
--- a/src/app/GitUI/GitUI.csproj
+++ b/src/app/GitUI/GitUI.csproj
@@ -7,7 +7,8 @@
     <Nullable>annotations</Nullable>
 
     <ForceDesignerDpiUnaware>true</ForceDesignerDpiUnaware>
-
+     <!-- Suppress suggestion to use experimental API ShowDialogAsync -->
+    <NoWarn>$(NoWarn);WFO5002</NoWarn>
     <!--
     For debug purposes uncomment these lines:
 
diff --git a/src/app/GitUI/GlobalSuppressions.cs b/src/app/GitUI/GlobalSuppressions.cs
index 0ffb7b2d4..fa76fc89b 100644
--- a/src/app/GitUI/GlobalSuppressions.cs
+++ b/src/app/GitUI/GlobalSuppressions.cs
@@ -8,8 +8,13 @@
 // "In Suppression File".
 // You do not need to add suppressions to this file manually.
 
+using System.Diagnostics.CodeAnalysis;
+
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1824:MarkAssembliesWithNeutralResourcesLanguage")]
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "Westhuis", Scope = "member", Target = "GitUI.AboutBox.#InitializeComponent()")]
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "Henk", Scope = "member", Target = "GitUI.AboutBox.#InitializeComponent()")]
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "henkwesthuis", Scope = "member", Target = "GitUI.AboutBox.#InitializeComponent()")]
 [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "ppk", Scope = "member", Target = "GitUI.BrowseForPrivateKey.#Browse(System.Windows.Forms.IWin32Window)")]
+[assembly: SuppressMessage("Usage", "VSTHRD103:Call async methods when in an async method", Justification = "<Pending>", Scope = "member", Target = "~M:GitUI.BuildServerIntegration.BuildServerWatcher.ShowBuildServerCredentialsFormAsync(System.String,GitUIPluginInterfaces.BuildServerIntegration.IBuildServerCredentials)~System.Threading.Tasks.Task{GitUIPluginInterfaces.BuildServerIntegration.IBuildServerCredentials}")]
+[assembly: SuppressMessage("Usage", "VSTHRD103:Call async methods when in an async method", Justification = "<Pending>", Scope = "member", Target = "~M:GitUI.CommandsDialogs.BrowseDialog.FormUpdates.Done")]
+[assembly: SuppressMessage("Usage", "VSTHRD103:Call async methods when in an async method", Justification = "<Pending>", Scope = "member", Target = "~M:GitUI.CommandsDialogs.RepoHosting.CreatePullRequestForm.PopulateBranchesComboAndEnableCreateButton(GitExtensions.Extensibility.Plugins.IHostedRemote,System.Windows.Forms.ComboBox)")]
diff --git a/src/plugins/Bitbucket/BitbucketRequestBase.cs b/src/plugins/Bitbucket/BitbucketRequestBase.cs
index d2ed56750..e79574061 100644
--- a/src/plugins/Bitbucket/BitbucketRequestBase.cs
+++ b/src/plugins/Bitbucket/BitbucketRequestBase.cs
@@ -27,7 +27,9 @@ namespace GitExtensions.Plugins.Bitbucket
         {
             if (Settings.DisableSSL)
             {
+#pragma warning disable SYSLIB0014 // Type or member is obsolete
                 System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
+#pragma warning restore SYSLIB0014 // Type or member is obsolete
             }
 
             Validates.NotNull(Settings.BitbucketUrl);
diff --git a/src/plugins/BuildServerIntegration/AzureDevOpsIntegration/GlobalSuppressions.cs b/src/plugins/BuildServerIntegration/AzureDevOpsIntegration/GlobalSuppressions.cs
new file mode 100644
index 000000000..042ee14ea
--- /dev/null
+++ b/src/plugins/BuildServerIntegration/AzureDevOpsIntegration/GlobalSuppressions.cs
@@ -0,0 +1,8 @@
+// This file is used by Code Analysis to maintain SuppressMessage
+// attributes that are applied to this project.
+// Project-level suppressions either have no target or are given
+// a specific target and scoped to a namespace, type, member, etc.
+
+using System.Diagnostics.CodeAnalysis;
+
+[assembly: SuppressMessage("Usage", "VSTHRD103:Call async methods when in an async method", Justification = "<Pending>", Scope = "member", Target = "~M:AzureDevOpsIntegration.AzureDevOpsAdapter.EnsureBuildDefinitionsIsInitializedAsync(System.IObserver{GitExtensions.Extensibility.BuildServerIntegration.BuildInfo})~System.Threading.Tasks.Task{System.Boolean}")]