diff --git a/15-EmptyCornellBoxFixedWalls/15-EmptyCornellBoxFixedWalls.csproj b/15-EmptyCornellBoxFixedWalls/15-EmptyCornellBoxFixedWalls.csproj
index f77467c..a73b9c8 100644
--- a/15-EmptyCornellBoxFixedWalls/15-EmptyCornellBoxFixedWalls.csproj
+++ b/15-EmptyCornellBoxFixedWalls/15-EmptyCornellBoxFixedWalls.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>