From c2ca7c78114472b707f7017c1a055e441f13f3b6 Mon Sep 17 00:00:00 2001
From: ike709 <ike709@users.noreply.github.com>
Date: Sun, 5 Jan 2025 18:16:01 -0600
Subject: [PATCH] .NET 9 (#5552)

Co-authored-by: ike709 <ike709@github.com>
---
 .github/workflows/build-docfx.yml      | 2 +-
 .github/workflows/build-test.yml       | 2 +-
 .github/workflows/publish-client.yml   | 2 +-
 .github/workflows/test-content.yml     | 2 +-
 Lidgren.Network/Lidgren.Network.csproj | 2 +-
 MSBuild/Robust.Engine.props            | 4 ++--
 MSBuild/Robust.Properties.targets      | 2 +-
 RELEASE-NOTES.md                       | 4 ++--
 global.json                            | 2 +-
 9 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/.github/workflows/build-docfx.yml b/.github/workflows/build-docfx.yml
index 11e03a123af..314263fed1d 100644
--- a/.github/workflows/build-docfx.yml
+++ b/.github/workflows/build-docfx.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v4.1.0
         with:
-          dotnet-version: 8.0.x
+          dotnet-version: 9.0.x
 
       - name: Install dependencies
         run: dotnet restore
diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index d30028c1c36..e8d4140bc87 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v4.1.0
         with:
-          dotnet-version: 8.0.x
+          dotnet-version: 9.0.x
       - name: Install dependencies
         run: dotnet restore
       - name: Build
diff --git a/.github/workflows/publish-client.yml b/.github/workflows/publish-client.yml
index 7f6a93cf522..6cac40e351e 100644
--- a/.github/workflows/publish-client.yml
+++ b/.github/workflows/publish-client.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v4.1.0
         with:
-          dotnet-version: 8.0.x
+          dotnet-version: 9.0.x
 
       - name: Package client
         run: Tools/package_client_build.py -p windows mac linux
diff --git a/.github/workflows/test-content.yml b/.github/workflows/test-content.yml
index f37cf9487a4..f66884ebbf1 100644
--- a/.github/workflows/test-content.yml
+++ b/.github/workflows/test-content.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v4.1.0
         with:
-          dotnet-version: 8.0.x
+          dotnet-version: 9.0.x
       - name: Disable submodule autoupdate
         run: touch BuildChecker/DISABLE_SUBMODULE_AUTOUPDATE
 
diff --git a/Lidgren.Network/Lidgren.Network.csproj b/Lidgren.Network/Lidgren.Network.csproj
index 4b4a1ea0772..685cfd9cba2 100644
--- a/Lidgren.Network/Lidgren.Network.csproj
+++ b/Lidgren.Network/Lidgren.Network.csproj
@@ -12,7 +12,7 @@
     <SkipRobustAnalyzer>true</SkipRobustAnalyzer>
 
     <Nullable>enable</Nullable>
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>13.0</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/MSBuild/Robust.Engine.props b/MSBuild/Robust.Engine.props
index db965d01bf0..939fa900b50 100644
--- a/MSBuild/Robust.Engine.props
+++ b/MSBuild/Robust.Engine.props
@@ -1,8 +1,8 @@
 <Project>
     <!-- Engine-specific properties. Content should not use this file. -->
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
-        <LangVersion>12</LangVersion>
+        <TargetFramework>net9.0</TargetFramework>
+        <LangVersion>13</LangVersion>
         <Nullable>enable</Nullable>
         <WarningsAsErrors>nullable</WarningsAsErrors>
     </PropertyGroup>
diff --git a/MSBuild/Robust.Properties.targets b/MSBuild/Robust.Properties.targets
index 440b84ad2ab..613a1a0fb67 100644
--- a/MSBuild/Robust.Properties.targets
+++ b/MSBuild/Robust.Properties.targets
@@ -3,7 +3,7 @@
   <!-- Import this at the end of any project files in Robust and Content. -->
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
 
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 7f18edae55f..fd22a40231d 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,4 +1,4 @@
-# Release notes for RobustToolbox.
+# Release notes for RobustToolbox.
 
 <!--
 NOTE: automatically updated sometimes by version.py.
@@ -35,7 +35,7 @@ END TEMPLATE-->
 
 ### Breaking changes
 
-*None yet*
+* Robust now uses **.NET 9**.
 
 ### New features
 
diff --git a/global.json b/global.json
index 391ba3c2a30..cdbb589edad 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "9.0.100",
     "rollForward": "latestFeature"
   }
 }