diff --git a/ChangeLog.md b/ChangeLog.md
index 131f914..f24129a 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### v1.3.1 / 2024-10-27
+
+  - Majiang.Board が配牌にドラがない・ドラが複数ある場合を処理できるよう修正
+
 ## v1.3.0 / 2024-10-19
 
   - Majiang.Board にメソッド last() を追加
diff --git a/lib/index.js b/lib/index.js
index ec498bf..2867f8d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,5 +1,5 @@
 /*!
- *  @kobalab/majiang-core v1.3.0
+ *  @kobalab/majiang-core v1.3.1
  *
  *  Copyright(C) 2021 Satoshi Kobayashi
  *  Released under the MIT license
diff --git a/package-lock.json b/package-lock.json
index 473aa3f..303dda8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@kobalab/majiang-core",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@kobalab/majiang-core",
-      "version": "1.3.0",
+      "version": "1.3.1",
       "license": "MIT",
       "devDependencies": {
         "mocha": "^10.7.3",
diff --git a/package.json b/package.json
index 6d2d664..be409c2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kobalab/majiang-core",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "麻雀基本ライブラリ",
   "publishConfig": {
     "access": "public"