diff --git a/build/AzurePipelineTemplates/CsWinRT-Variables.yml b/build/AzurePipelineTemplates/CsWinRT-Variables.yml
index 387c9279f..843dad457 100644
--- a/build/AzurePipelineTemplates/CsWinRT-Variables.yml
+++ b/build/AzurePipelineTemplates/CsWinRT-Variables.yml
@@ -5,7 +5,7 @@ variables:
 - name: MinorVersion
   value: 1
 - name: PatchVersion
-  value: 4
+  value: 5
 - name: WinRT.Runtime.AssemblyVersion
   value: '2.1.0.0'
 - name: Net5.SDK.Feed
diff --git a/src/Authoring/WinRT.SourceGenerator/Helper.cs b/src/Authoring/WinRT.SourceGenerator/Helper.cs
index 459de7cab..3b877af1d 100644
--- a/src/Authoring/WinRT.SourceGenerator/Helper.cs
+++ b/src/Authoring/WinRT.SourceGenerator/Helper.cs
@@ -1045,7 +1045,7 @@ public static string GetAbiMarshalerType(string type, string abiType, TypeKind k
 
         public static string EscapeTypeNameForIdentifier(string typeName)
         {
-            return Regex.Replace(typeName, """[(\ |:<>,\.\-@)]""", "_");
+            return Regex.Replace(typeName, """[(\ |:<>,\.\-@;+'^!`)]""", "_");
         }
 
         public readonly struct MappedType