diff --git a/CHANGELIST.md b/CHANGELIST.md
index eae48683..c2d24f1b 100644
--- a/CHANGELIST.md
+++ b/CHANGELIST.md
@@ -1,4 +1,4 @@
-### WIP (xxxx-xx-xx)
+### 2.6.6 (2023-10-04)
 
 - Update Nuget packages
 - Update to MMI 3.0.0-preview.2
diff --git a/MPF.Check/MPF.Check.csproj b/MPF.Check/MPF.Check.csproj
index 2f469551..fee669a8 100644
--- a/MPF.Check/MPF.Check.csproj
+++ b/MPF.Check/MPF.Check.csproj
@@ -8,7 +8,7 @@
     <Description>Validator for various dumping programs</Description>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/MPF.Core/MPF.Core.csproj b/MPF.Core/MPF.Core.csproj
index f6a94249..90b2c498 100644
--- a/MPF.Core/MPF.Core.csproj
+++ b/MPF.Core/MPF.Core.csproj
@@ -5,7 +5,7 @@
     <RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
diff --git a/MPF.Library/MPF.Library.csproj b/MPF.Library/MPF.Library.csproj
index 075fd228..de831206 100644
--- a/MPF.Library/MPF.Library.csproj
+++ b/MPF.Library/MPF.Library.csproj
@@ -5,7 +5,7 @@
     <RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
diff --git a/MPF.Modules/MPF.Modules.csproj b/MPF.Modules/MPF.Modules.csproj
index a69bec19..2c23ee4d 100644
--- a/MPF.Modules/MPF.Modules.csproj
+++ b/MPF.Modules/MPF.Modules.csproj
@@ -5,7 +5,7 @@
     <RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
diff --git a/MPF.UI.Core/MPF.UI.Core.csproj b/MPF.UI.Core/MPF.UI.Core.csproj
index c86684e8..1e5ac337 100644
--- a/MPF.UI.Core/MPF.UI.Core.csproj
+++ b/MPF.UI.Core/MPF.UI.Core.csproj
@@ -7,7 +7,7 @@
     <UseWPF>true</UseWPF>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/MPF/MPF.csproj b/MPF/MPF.csproj
index f1eeb412..c6989f55 100644
--- a/MPF/MPF.csproj
+++ b/MPF/MPF.csproj
@@ -11,7 +11,7 @@
     <Description>Frontend for various dumping programs</Description>
     <Authors>Matt Nadareski;ReignStumble;Jakz</Authors>
     <Copyright>Copyright (c)2019-2023</Copyright>
-    <Version>2.6.5</Version>
+    <Version>2.6.6</Version>
     <InternalsVisibleTo>MPF.Test</InternalsVisibleTo>
   </PropertyGroup>
 
diff --git a/appveyor.yml b/appveyor.yml
index 71ae2a60..e6cb9dd0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,5 +1,5 @@
 # version format
-version: 2.6.5-{build}
+version: 2.6.6-{build}
 
 # pull request template
 pull_requests: