diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 7d04737..b7e4aff 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,6 +1,6 @@
 # Release Notes
 
-## XMLUnit.NET 2.9.1 - /not released, yet/
+## XMLUnit.NET 2.9.1 - /Released 2021-12-16/
 
 * improved comparison performance for documents with many siblings
   based on a suggestion by [@gerpres](https://github.com/gerpres) made
diff --git a/src/shared/CommonAssemblyInfo.cs b/src/shared/CommonAssemblyInfo.cs
index 7da8322..d4df503 100644
--- a/src/shared/CommonAssemblyInfo.cs
+++ b/src/shared/CommonAssemblyInfo.cs
@@ -26,7 +26,7 @@ namespace Org.XmlUnit
     internal static class XmlUnitVersion
     {
         internal const string ApiVersion = "2.9.1";
-        internal const string AssemblyVersion = ApiVersion + ".205";
-        internal const string Version = ApiVersion + "-alpha";
+        internal const string AssemblyVersion = ApiVersion + ".209";
+        internal const string Version = ApiVersion;
     } 
 }