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..50758c2 100644
--- a/SrcSet.Core/SrcSet.Core.csproj
+++ b/SrcSet.Core/SrcSet.Core.csproj
@@ -21,7 +21,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
-		<PackageReference Include="SixLabors.ImageSharp" Version="3.0.2" />
+		<PackageReference Include="SixLabors.ImageSharp" Version="3.1.0" />
 		<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