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/PowerShellExtensionFactory.cs b/src/wixext/PowerShellExtensionFactory.cs
index 22a4ad88..44f836e0 100644
--- a/src/wixext/PowerShellExtensionFactory.cs
+++ b/src/wixext/PowerShellExtensionFactory.cs
@@ -8,7 +8,7 @@ namespace WixToolset.PowerShell
 
     public class PowerShellExtensionFactory : BaseExtensionFactory
     {
-        protected override IEnumerable<Type> ExtensionTypes => new[]
+        protected override IReadOnlyCollection<Type> ExtensionTypes => new[]
         {
             typeof(PSCompiler),
             typeof(PSExtensionData),