diff --git a/20-CornellBoxArbitraryPDFFunctions/20-CornellBoxArbitraryPDFFunctions.csproj b/20-CornellBoxArbitraryPDFFunctions/20-CornellBoxArbitraryPDFFunctions.csproj
index 1ce7b99..bea0292 100644
--- a/20-CornellBoxArbitraryPDFFunctions/20-CornellBoxArbitraryPDFFunctions.csproj
+++ b/20-CornellBoxArbitraryPDFFunctions/20-CornellBoxArbitraryPDFFunctions.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SixLabors.ImageSharp" Version="1.0.0-beta0007" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="2.1.7" />
   </ItemGroup>
 
   <ItemGroup>