diff --git a/CHANGELOG.md b/CHANGELOG.md
index d945301f..54f63487 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog for Jikka
 
+## 2021-08-01: v5.1.0.0
+
+- Now Kubaru DP is converted to Morau DP.
+- The runtime headers are automatically bundled to generated C++ code.
+
 ## 2021-07-28: v5.0.11.1
 
 Uploaded to Hackage: <https://hackage.haskell.org/package/Jikka>
diff --git a/CONTRIBUTING.ja.md b/CONTRIBUTING.ja.md
index 7e6e51b9..b50b0eb8 100644
--- a/CONTRIBUTING.ja.md
+++ b/CONTRIBUTING.ja.md
@@ -82,5 +82,4 @@ $ stack haddock
 
 ### Versioning
 
-受け入れる Python 風言語の仕様を public API と見なしての [Semantic Versioning](https://semver.org/lang/ja/) が使われています。
-ただし [Haskell Package Versioning Policy](https://pvp.haskell.org/) に由来して MAJOR versions をふたつ持っています。
+[Haskell Package Versioning Policy](https://pvp.haskell.org/) に準拠しています。
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5df3ee26..c95db0eb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -82,5 +82,4 @@ Use [Conventional Commits](https://www.conventionalcommits.org/).
 
 ### Versioning
 
-[Semantic Versioning](https://semver.org/lang/ja/) is used with regard to the Python-like language as its public API.
-However, it has two MAJOR version that come from [Haskell Package Versioning Policy](https://pvp.haskell.org/).
+Conforming to [Haskell Package Versioning Policy](https://pvp.haskell.org/).
diff --git a/Jikka.cabal b/Jikka.cabal
index a47ffbcc..f510b278 100644
--- a/Jikka.cabal
+++ b/Jikka.cabal
@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack
 
 name:           Jikka
-version:        5.0.11.2
+version:        5.1.0.0
 synopsis:       A transpiler from Python to C++ for competitive programming
 description:    Please see the README on GitHub at <https://github.com/kmyk/Jikka>
 category:       Compilers/Interpreters
diff --git a/docs/language.ja.md b/docs/language.ja.md
index 92827de2..604a2870 100644
--- a/docs/language.ja.md
+++ b/docs/language.ja.md
@@ -11,8 +11,8 @@
 ## †破壊的変更†について
 
 この言語仕様は開発の初期段階のものです。
-第 2 のメジャーバージョンが 0 (`v5.0.y.z`) である限り、いつでも、いかなる変更も起こりえます (MAY)。
-[Semantic Versioning の項目 (4.)](https://semver.org/#spec-item-4) も参考のこと。
+いつでも、いかなる変更も起こりえます。
+特に、追加の演算子のような拡張機能を使うなどの、Python と非互換な書き方をする場合には注意してください。
 
 ## Syntax
 
diff --git a/docs/language.md b/docs/language.md
index a08ab400..34853fe5 100644
--- a/docs/language.md
+++ b/docs/language.md
@@ -11,8 +11,8 @@
 ## About BREAKING CHANGE
 
 This language specification is in initial development.
-While the second major version is zero (`v5.0.y.z`), anything MAY change at any time.
-See also [item (4.) of Semantic Versioning](https://semver.org/#spec-item-4).
+Aything MAY change at any time.
+Especially, please be careful when you write code incompatible to Python, including our language extensions.
 
 ## Syntax
 
diff --git a/package.yaml b/package.yaml
index 85895ba0..86860ae7 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: Jikka
-version: 5.0.11.2
+version: 5.1.0.0
 github: "kmyk/Jikka"
 license: Apache
 author: "Kimiyuki Onaka"