diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4de31d1..543130f 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).
 
+## [3.4.1] - 2023-10-26
+### Changed
+- Rename `AtCoder.Internal.BigMul` into `AtCoder.Internal.Mul128`
+
 ## [3.4.0] - 2023-10-26
 ### Changed
 - Separate `MathLib` and `InternalMath` implementations in separate classes
diff --git a/Directory.Build.props b/Directory.Build.props
index e23c973..3e8a939 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>3.4.0</Version>
-    <AssemblyVersion>3.4.0.101</AssemblyVersion>
+    <Version>3.4.1</Version>
+    <AssemblyVersion>3.4.1.101</AssemblyVersion>
     <RepositoryCommit Condition="'$(GIT_COMMIT)' != ''">$(GIT_COMMIT)</RepositoryCommit>
 
     <SignAssembly>True</SignAssembly>