diff --git a/SrcSet.Core/ImageExtensions.cs b/SrcSet.Core/ImageExtensions.cs
index f006806..2903862 100644
--- a/SrcSet.Core/ImageExtensions.cs
+++ b/SrcSet.Core/ImageExtensions.cs
@@ -1,3 +1,6 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+
 namespace SrcSet.Core;
 
 public static class ImageExtensions
diff --git a/SrcSet.Core/SizeExtensions.cs b/SrcSet.Core/SizeExtensions.cs
index 421d429..c570363 100644
--- a/SrcSet.Core/SizeExtensions.cs
+++ b/SrcSet.Core/SizeExtensions.cs
@@ -1,3 +1,5 @@
+using SixLabors.ImageSharp;
+
 namespace SrcSet.Core;
 
 public static class SizeExtensions
diff --git a/SrcSet.Core/SrcSet.Core.csproj b/SrcSet.Core/SrcSet.Core.csproj
index ab49ce7..ec96323 100644
--- a/SrcSet.Core/SrcSet.Core.csproj
+++ b/SrcSet.Core/SrcSet.Core.csproj
@@ -1,27 +1,27 @@
-<Project Sdk="Microsoft.NET.Sdk">
-	<PropertyGroup>
-		<PackageId>SrcSet.Core</PackageId>
-		<Description>A library to create sets of responsive images for the web</Description>
-		<Version>5.0.0</Version>
-		<Authors>ecoAPM LLC</Authors>
-		<Company>ecoAPM LLC</Company>
-		<Copyright>ecoAPM LLC</Copyright>
-		<Product>SrcSet</Product>
-		<TargetFramework>net8.0</TargetFramework>
-		<PackageReadmeFile>README.md</PackageReadmeFile>
-		<PackageProjectUrl>https://github.com/ecoAPM/SrcSet</PackageProjectUrl>
-		<PackageLicenseExpression>MIT</PackageLicenseExpression>
-		<RepositoryUrl>https://github.com/ecoAPM/SrcSet</RepositoryUrl>
-		<PublishRepositoryUrl>true</PublishRepositoryUrl>
-		<IncludeSymbols>true</IncludeSymbols>
-		<EmbedUntrackedSources>true</EmbedUntrackedSources>
-		<ImplicitUsings>enable</ImplicitUsings>
-		<Nullable>enable</Nullable>
-	</PropertyGroup>
-
-	<ItemGroup>
-		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
-		<PackageReference Include="SixLabors.ImageSharp" Version="3.0.2" />
-		<None Include="../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="." />
-	</ItemGroup>
+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<PackageId>SrcSet.Core</PackageId>
+		<Description>A library to create sets of responsive images for the web</Description>
+		<Version>5.0.0</Version>
+		<Authors>ecoAPM LLC</Authors>
+		<Company>ecoAPM LLC</Company>
+		<Copyright>ecoAPM LLC</Copyright>
+		<Product>SrcSet</Product>
+		<TargetFramework>net8.0</TargetFramework>
+		<PackageReadmeFile>README.md</PackageReadmeFile>
+		<PackageProjectUrl>https://github.com/ecoAPM/SrcSet</PackageProjectUrl>
+		<PackageLicenseExpression>MIT</PackageLicenseExpression>
+		<RepositoryUrl>https://github.com/ecoAPM/SrcSet</RepositoryUrl>
+		<PublishRepositoryUrl>true</PublishRepositoryUrl>
+		<IncludeSymbols>true</IncludeSymbols>
+		<EmbedUntrackedSources>true</EmbedUntrackedSources>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
+		<PackageReference Include="SixLabors.ImageSharp" Version="3.1.1" />
+		<None Include="../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="." />
+	</ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/SrcSet.Core/SrcSetManager.cs b/SrcSet.Core/SrcSetManager.cs
index 9f6f3bc..f4c31b3 100644
--- a/SrcSet.Core/SrcSetManager.cs
+++ b/SrcSet.Core/SrcSetManager.cs
@@ -1,3 +1,5 @@
+using SixLabors.ImageSharp;
+
 namespace SrcSet.Core;
 
 public sealed class SrcSetManager