diff --git a/build/build.fs b/build/build.fs
index 3d6250cc..e7c4b15f 100644
--- a/build/build.fs
+++ b/build/build.fs
@@ -1,7 +1,6 @@
 open System
 open System.Diagnostics
 open System.IO
-open System.Text.RegularExpressions
 
 open Fake.Core
 open Fake.Core.TargetOperators
@@ -17,7 +16,7 @@ let description = Target.description
 
 module FileReaderWriter =
     let Read file = File.ReadAllText(file)
-    let Write file text = File.WriteAllText(file, text)
+    let Write file (text: string) = File.WriteAllText(file, text)
     let TransformFile file target (f : string -> string) =
         Read file
         |> f
diff --git a/build/build.fsproj b/build/build.fsproj
index 4f3604de..f46710b0 100644
--- a/build/build.fsproj
+++ b/build/build.fsproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <OutputPath>buildOutput</OutputPath>
   </PropertyGroup>
@@ -14,9 +14,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Build" Version="17.9.5" />
-    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="17.9.5" />
-    <PackageReference Include="MSBuild.StructuredLogger" Version="2.2.374" />
+    <PackageReference Include="Microsoft.Build" Version="17.12.6" />
+    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="17.12.6" />
+    <PackageReference Include="MSBuild.StructuredLogger" Version="2.2.386" />
     <PackageReference Include="Fake.DotNet.Cli" Version="6.1.3" />
     <PackageReference Include="Fake.Core.Target" Version="6.1.3" />
   </ItemGroup>