diff --git a/Directory.Build.props b/Directory.Build.props
index 26741df6c..292bbd51a 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -27,7 +27,7 @@
   <!-- Specific to .NET 9 -->
   <PropertyGroup>
     <NuGetAuditMode>direct</NuGetAuditMode>
-    <NoWarn>$(NoWarn);NU1608;NETSDK1215</NoWarn>
+    <NoWarn>$(NoWarn);NU5104;NU1608</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
diff --git a/benchmarks/Benchmarks.csproj b/benchmarks/Benchmarks.csproj
index 9dbb9ba09..90d53461d 100644
--- a/benchmarks/Benchmarks.csproj
+++ b/benchmarks/Benchmarks.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ServerGarbageCollection>true</ServerGarbageCollection>
   </PropertyGroup>
 
diff --git a/package-versions.props b/package-versions.props
index b5d2f30cb..1fbbe82cb 100644
--- a/package-versions.props
+++ b/package-versions.props
@@ -22,7 +22,7 @@
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net9.0'">
     <!-- Published dependencies (only update on major version change) -->
-    <EntityFrameworkCoreFrozenVersion>N/A</EntityFrameworkCoreFrozenVersion>
+    <EntityFrameworkCoreFrozenVersion>9.0.0</EntityFrameworkCoreFrozenVersion>
 
     <!-- Non-published dependencies (these are safe to update, won't cause a breaking change) -->
     <AspNetCoreVersion>9.0.*</AspNetCoreVersion>
diff --git a/src/JsonApiDotNetCore.Annotations/JsonApiDotNetCore.Annotations.csproj b/src/JsonApiDotNetCore.Annotations/JsonApiDotNetCore.Annotations.csproj
index 04238621d..3ee7f4d42 100644
--- a/src/JsonApiDotNetCore.Annotations/JsonApiDotNetCore.Annotations.csproj
+++ b/src/JsonApiDotNetCore.Annotations/JsonApiDotNetCore.Annotations.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net6.0;netstandard1.0</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;net6.0;netstandard2.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <RootNamespace>JsonApiDotNetCore</RootNamespace>
@@ -31,17 +31,17 @@
 
   <!-- We multi-target against NetStandard solely to enable consumers to share their models project with .NET Framework code. -->
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <Using Remove="System.Net.Http" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <Compile Remove="**/*.cs" />
     <Compile Include="**/*.shared.cs" />
     <Compile Include="**/*.netstandard.cs" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' != 'netstandard1.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' != 'netstandard2.0' ">
     <Compile Remove="**/*.netstandard.cs" />
     <None Include="**/*.netstandard.cs" />
   </ItemGroup>
diff --git a/src/JsonApiDotNetCore/JsonApiDotNetCore.csproj b/src/JsonApiDotNetCore/JsonApiDotNetCore.csproj
index 0f395511a..b6fdb6e8e 100644
--- a/src/JsonApiDotNetCore/JsonApiDotNetCore.csproj
+++ b/src/JsonApiDotNetCore/JsonApiDotNetCore.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>net9.0;net8.0;net6.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>