diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4124b53..3ca6c3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ 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).
 
+## [3.0.0-pre1] - 2023-01-24
+- Rename assembly from AtCoderLibrary to ac-library-csharp
+- Rename some methods/classes to PascalCase
+
+## [3.0.0-atcoder1] - 2023-01-24
+- Make SourceExpander.Embedder switchable
+- Disable some Contract.Assert
+
 ## [2.1.1] - 2023-01-17
 - Optimize PrimitiveRoot
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 95ddb0b..5464dae 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -7,8 +7,8 @@
     <RepositoryUrl>https://github.com/kzrnm/ac-library-csharp</RepositoryUrl>
     <PackageReleaseNotes>https://github.com/kzrnm/ac-library-csharp/blob/main/CHANGELOG.md</PackageReleaseNotes>
 
-    <Version>2.1.1</Version>
-    <AssemblyVersion>2.1.1.101</AssemblyVersion>
+    <Version>3.0.0-pre1</Version>
+    <AssemblyVersion>3.0.0.51</AssemblyVersion>
     <RepositoryCommit Condition="'$(GIT_COMMIT)' != ''">$(GIT_COMMIT)</RepositoryCommit>
 
     <SignAssembly>True</SignAssembly>