--- a/Benchmarks/Benchmarks.fsproj
+++ b/Benchmarks/Benchmarks.fsproj
@@ -2,7 +2,7 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
     </PropertyGroup>
 
     <ItemGroup>
--- a/LanguageServerProtocol/LanguageServerProtocol.fsproj
+++ b/LanguageServerProtocol/LanguageServerProtocol.fsproj
@@ -9,7 +9,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageProjectUrl>https://github.com/ionide/LanguageServerProtocol</PackageProjectUrl>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <!-- FsLibLog.fs comes verbatim from
--- a/MarkdigPatches/MarkdigPatches.csproj
+++ b/MarkdigPatches/MarkdigPatches.csproj
@@ -3,7 +3,7 @@
     <PropertyGroup>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
     </PropertyGroup>
 
     <ItemGroup>
--- a/Marksman/Marksman.fsproj
+++ b/Marksman/Marksman.fsproj
@@ -4,7 +4,7 @@
         <OutputType>Exe</OutputType>
         <AssemblyName>marksman</AssemblyName>
         <VersionPrefix>1.0.0</VersionPrefix>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
     </PropertyGroup>
     <Target Name="Version" BeforeTargets="BeforeBuild">
         <Exec Command="git describe --always --dirty" ConsoleToMSBuild="true" Condition="'$(VersionString)'==''">
--- a/Tests/Tests.fsproj
+++ b/Tests/Tests.fsproj
@@ -4,7 +4,7 @@
 
         <IsPackable>false</IsPackable>
         <GenerateProgramFile>false</GenerateProgramFile>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
     </PropertyGroup>
 
     <ItemGroup>