2 files changed, 2 insertions, 2 deletions

diff --git a/global.json b/global.json
index fc26eb6e..23dd3fa6 100644
--- a/global.json
+++ b/global.json
@@ -1,5 +1,5 @@
 {
   "msbuild-sdks": {
-    "WixToolset.Sdk": "4.0.0-build-0206"
+    "WixToolset.Sdk": "4.0.0-build-0211"
   }
 }
diff --git a/src/wixext/DirectXExtensionFactory.cs b/src/wixext/DirectXExtensionFactory.cs
index b3755ee9..fb7f84aa 100644
--- a/src/wixext/DirectXExtensionFactory.cs
+++ b/src/wixext/DirectXExtensionFactory.cs
@@ -8,7 +8,7 @@ namespace WixToolset.DirectX
 
     public class DirectXExtensionFactory : BaseExtensionFactory
     {
-        protected override IEnumerable<Type> ExtensionTypes => new[]
+        protected override IReadOnlyCollection<Type> ExtensionTypes => new[]
         {
             typeof(DirectXExtensionData),
         };