diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24138178..6914257e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.7] - 2021-02-09
+### Changed
+- Optimize PriorityQueue<TKey, TValue>
+
 ## [1.2.6] - 2021-02-09
 ### Added
 - Add PriorityQueue.TryDequeue
diff --git a/Directory.Build.props b/Directory.Build.props
index 1be78654..d30fa0f8 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -7,8 +7,8 @@
     <RepositoryUrl>https://github.com/naminodarie/ac-library-csharp</RepositoryUrl>
     <PackageReleaseNotes>https://github.com/naminodarie/ac-library-csharp/blob/master/CHANGELOG.md</PackageReleaseNotes>
 
-    <Version>1.2.6</Version>
-    <AssemblyVersion>1.2.6.100</AssemblyVersion>
+    <Version>1.2.7</Version>
+    <AssemblyVersion>1.2.7.100</AssemblyVersion>
     <RepositoryCommit Condition="'$(GIT_COMMIT)' != ''">$(GIT_COMMIT)</RepositoryCommit>
 
     <SignAssembly>True</SignAssembly>