diff --git a/NAudio.Asio/NAudio.Asio.csproj b/NAudio.Asio/NAudio.Asio.csproj
index 8e979d00..90415ee9 100644
--- a/NAudio.Asio/NAudio.Asio.csproj
+++ b/NAudio.Asio/NAudio.Asio.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Mark Heath</Authors>
@@ -12,7 +12,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
diff --git a/NAudio.Core/NAudio.Core.csproj b/NAudio.Core/NAudio.Core.csproj
index 016fef7b..64c7dd44 100644
--- a/NAudio.Core/NAudio.Core.csproj
+++ b/NAudio.Core/NAudio.Core.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <Authors>Mark Heath</Authors>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <SignAssembly>true</SignAssembly>
@@ -11,7 +11,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
diff --git a/NAudio.Extras/NAudio.Extras.csproj b/NAudio.Extras/NAudio.Extras.csproj
index 1092a479..578cf31a 100644
--- a/NAudio.Extras/NAudio.Extras.csproj
+++ b/NAudio.Extras/NAudio.Extras.csproj
@@ -10,9 +10,9 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
 
diff --git a/NAudio.Midi/NAudio.Midi.csproj b/NAudio.Midi/NAudio.Midi.csproj
index cae86c47..e5205ad6 100644
--- a/NAudio.Midi/NAudio.Midi.csproj
+++ b/NAudio.Midi/NAudio.Midi.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Mark Heath</Authors>
@@ -11,7 +11,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
diff --git a/NAudio.Uap/NAudio.Uap.csproj b/NAudio.Uap/NAudio.Uap.csproj
index ee117a87..d29c49d7 100644
--- a/NAudio.Uap/NAudio.Uap.csproj
+++ b/NAudio.Uap/NAudio.Uap.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <!-- https://docs.microsoft.com/en-us/windows/uwp/updates-and-versions/choose-a-uwp-version -->
     <TargetFramework>uap10.0.18362</TargetFramework>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Mark Heath</Authors>
@@ -12,7 +12,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
diff --git a/NAudio.Wasapi/NAudio.Wasapi.csproj b/NAudio.Wasapi/NAudio.Wasapi.csproj
index 7a84fa47..b36e25a4 100644
--- a/NAudio.Wasapi/NAudio.Wasapi.csproj
+++ b/NAudio.Wasapi/NAudio.Wasapi.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;uap10.0.18362</TargetFrameworks>
-    <Version>22.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Mark Heath</Authors>
@@ -11,7 +11,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
diff --git a/NAudio.WinForms/NAudio.WinForms.csproj b/NAudio.WinForms/NAudio.WinForms.csproj
index 53fae751..a07760ad 100644
--- a/NAudio.WinForms/NAudio.WinForms.csproj
+++ b/NAudio.WinForms/NAudio.WinForms.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFrameworks>net472;netcoreapp3.1</TargetFrameworks>
     <UseWindowsForms>true</UseWindowsForms>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Mark Heath</Authors>
@@ -12,7 +12,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
diff --git a/NAudio.WinMM/NAudio.WinMM.csproj b/NAudio.WinMM/NAudio.WinMM.csproj
index a6f6d5df..75503e42 100644
--- a/NAudio.WinMM/NAudio.WinMM.csproj
+++ b/NAudio.WinMM/NAudio.WinMM.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0</TargetFrameworks>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <SignAssembly>true</SignAssembly>
@@ -10,7 +10,7 @@
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>naudio-icon.png</PackageIcon>
   </PropertyGroup>
diff --git a/NAudio/NAudio.csproj b/NAudio/NAudio.csproj
index a278ed1b..f204c07d 100644
--- a/NAudio/NAudio.csproj
+++ b/NAudio/NAudio.csproj
@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net472;netcoreapp3.1;net6.0-windows;net6.0</TargetFrameworks>
-    <Version>2.2.0</Version>
+    <Version>2.2.1</Version>
     <Authors>Mark Heath &amp; Contributors</Authors>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Description>NAudio, an audio library for .NET</Description>
     <PackageProjectUrl>https://github.com/naudio/NAudio</PackageProjectUrl>
     <PackageTags>C# .NET audio sound</PackageTags>
     <RepositoryUrl>https://github.com/naudio/NAudio</RepositoryUrl>
-    <Copyright>© Mark Heath 2022</Copyright>
+    <Copyright>© Mark Heath 2023</Copyright>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <GenerateDocumentationFile>True</GenerateDocumentationFile>
     <PackageLicenseFile>license.txt</PackageLicenseFile>
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index a82101af..e489cb23 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,8 @@
+### 2.2.1 (4 Sep 2023)
+
+	* Incorrectly versioned NAudio.Wasapi.dll (was 22.0) retired and replaced with 2.2.1
+	* No other changes
+
 ### 2.2 (22 Aug 2023)
 
  * `WdlResampler` is now public