diff --git a/src/ImageSharp/ImageSharp.csproj b/src/ImageSharp/ImageSharp.csproj
index d94d02aa2..ec05e662d 100644
--- a/src/ImageSharp/ImageSharp.csproj
+++ b/src/ImageSharp/ImageSharp.csproj
@@ -19,8 +19,6 @@
   <PropertyGroup>
     <Nullable>enable</Nullable>
     <WarningsAsErrors>Nullable</WarningsAsErrors>
-    <TargetFrameworks>net8.0</TargetFrameworks>
-    <IsTrimmable>true</IsTrimmable>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -28,6 +26,21 @@
     <MinVerMinimumMajorMinor>4.0</MinVerMinimumMajorMinor>
   </PropertyGroup>
 
+  <Choose>
+    <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
+      <PropertyGroup>
+        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+        <IsTrimmable>true</IsTrimmable>
+      </PropertyGroup>
+    </When>
+    <Otherwise>
+      <PropertyGroup>
+        <TargetFrameworks>net8.0</TargetFrameworks>
+        <IsTrimmable>true</IsTrimmable>
+      </PropertyGroup>
+    </Otherwise>
+  </Choose>
+
   <ItemGroup>
     <None Include="..\..\LICENSE" Pack="true" PackagePath="" />
     <None Include="..\..\shared-infrastructure\branding\icons\imagesharp\sixlabors.imagesharp.128.png" Pack="true" PackagePath="" />
diff --git a/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj b/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
index a91c78576..a705b24b2 100644
--- a/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
+++ b/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
@@ -2,7 +2,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0</TargetFrameworks>
     <AssemblyName>ImageSharp.Benchmarks</AssemblyName>
     <OutputType>Exe</OutputType>
     <RootNamespace>SixLabors.ImageSharp.Benchmarks</RootNamespace>
@@ -21,6 +20,19 @@
     <NoWarn>CA1822</NoWarn>
   </PropertyGroup>
 
+  <Choose>
+    <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
+      <PropertyGroup>
+        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+      </PropertyGroup>
+    </When>
+    <Otherwise>
+      <PropertyGroup>
+        <TargetFrameworks>net8.0</TargetFrameworks>
+      </PropertyGroup>
+    </Otherwise>
+  </Choose>
+
   <ItemGroup>
     <Compile Include="..\ImageSharp.Tests\TestImages.cs" Link="Tests\TestImages.cs" />
     <Compile Include="..\ImageSharp.Tests\TestUtilities\TestEnvironment.cs" Link="Tests\TestEnvironment.cs" />
diff --git a/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj b/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
index cf028ad75..832f3d171 100644
--- a/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
+++ b/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
@@ -2,7 +2,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0</TargetFrameworks>
     <AssemblyName>ImageSharp.Tests.ProfilingSandbox</AssemblyName>
     <Description>A cross-platform library for processing of image files written in C#</Description>
     <OutputType>Exe</OutputType>
@@ -17,6 +16,19 @@
     <ValidateExecutableReferencesMatchSelfContained>false</ValidateExecutableReferencesMatchSelfContained>
   </PropertyGroup>
 
+  <Choose>
+    <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
+      <PropertyGroup>
+        <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
+      </PropertyGroup>
+    </When>
+    <Otherwise>
+      <PropertyGroup>
+        <TargetFrameworks>net8.0</TargetFrameworks>
+      </PropertyGroup>
+    </Otherwise>
+  </Choose>
+
   <ItemGroup>
     <Compile Remove="..\ImageSharp.Tests\IO\LocalFileSystem.cs" />
     <Compile Include="..\ImageSharp.Benchmarks\LoadResizeSave\LoadResizeSaveStressRunner.cs" Link="LoadResizeSaveStressRunner.cs" />
diff --git a/tests/ImageSharp.Tests/ImageSharp.Tests.csproj b/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
index 1a89545a4..9af4f41a8 100644
--- a/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
+++ b/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
@@ -22,7 +22,7 @@
     </Otherwise>
   </Choose>
 
-<ItemGroup>
+  <ItemGroup>
     <InternalsVisibleTo Include="ImageSharp.Tests.ProfilingSandbox" Key="$(SixLaborsPublicKey)" />
   </ItemGroup>