diff --git a/global.json b/global.json
index 83ab5c5..616b0b8 100644
--- a/global.json
+++ b/global.json
@@ -1,5 +1,5 @@
 {
   "msbuild-sdks": {
-    "WixToolset.Sdk": "4.0.0-build-0209"
+    "WixToolset.Sdk": "4.0.0-build-0210"
   }
 }
diff --git a/src/wixext/DependencyExtensionFactory.cs b/src/wixext/DependencyExtensionFactory.cs
index 354f923..413f99a 100644
--- a/src/wixext/DependencyExtensionFactory.cs
+++ b/src/wixext/DependencyExtensionFactory.cs
@@ -8,7 +8,7 @@ namespace WixToolset.Dependency
 
     public class DependencyExtensionFactory : BaseExtensionFactory
     {
-        protected override IEnumerable<Type> ExtensionTypes => new[]
+        protected override IReadOnlyCollection<Type> ExtensionTypes => new[]
         {
             typeof(DependencyCompiler),
             typeof(DependencyExtensionData),