diff --git a/docs/index.html b/docs/index.html
index 9a8342b94..fccc01946 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -42,10 +42,10 @@
 
     </header>
     <main>
-        <a href="https://github.com/vrm-c/UniVRM/releases/download/v0.90.0/UniVRM-0.90.0_d192.unitypackage" class="btn">
+        <a href="https://github.com/vrm-c/UniVRM/releases/download/v0.91.0/UniVRM-0.91.0_72a1.unitypackage" class="btn">
             <div class="btn">
                 <h1>Download</h1>
-                <h2>UniVRM-0.90.0</h2>
+                <h2>UniVRM-0.91.0</h2>
             </div>
         </a>
     </main>
diff --git a/docs/release/079/v0.91.0.md b/docs/release/079/v0.91.0.md
new file mode 100644
index 000000000..8aec2abfc
--- /dev/null
+++ b/docs/release/079/v0.91.0.md
@@ -0,0 +1,26 @@
+# v0.91.0: 1.0準備
+
+## export option 追加
+* [[\#1415](https://github.com/vrm-c/UniVRM/pull/1415)] Feature/keep vertex color
+
+## texture importer 設定関連
+* [[\#1410](https://github.com/vrm-c/UniVRM/pull/1410)] Add the capability of importing texture extension.
+* [[\#1402](https://github.com/vrm-c/UniVRM/pull/1402)] While importing in Unity Editor, `Max Size` property is invalid if a texture size was larger than 2048.
+* [[\#1403](https://github.com/vrm-c/UniVRM/pull/1403)] Ignore texture compression settings while exporting glTF / VRM.
+
+## 1.0
+* [[\#1409](https://github.com/vrm-c/UniVRM/pull/1409)] 同一のバイト列を参照するBufferAccessor が複数回、座標変換(右手・左手変換)されるのを回避する
+* [[\#1405](https://github.com/vrm-c/UniVRM/pull/1405)] skin があるが mesh が無い
+
+## その他
+* [[\#1416](https://github.com/vrm-c/UniVRM/pull/1416)] UniVRM-0.91.0
+* [[\#1414](https://github.com/vrm-c/UniVRM/pull/1414)] Make public constructor of interface class.
+* [[\#1412](https://github.com/vrm-c/UniVRM/pull/1412)] Remove unused AOT Call generation
+* [[\#1411](https://github.com/vrm-c/UniVRM/pull/1411)] Refactoring top menues of UniGLTF and UniVRM 0.x
+* [[\#1407](https://github.com/vrm-c/UniVRM/pull/1407)] Change ITextureDeserializer interface. The implementation must set sampler params.
+* [[\#1404](https://github.com/vrm-c/UniVRM/pull/1404)] UniHumanoid のフォルダ構成を整理
+* [[\#1400](https://github.com/vrm-c/UniVRM/pull/1400)] Fix migration error in MToon & Modify Screen Coords Outline drawing algorithm.
+* [[\#1399](https://github.com/vrm-c/UniVRM/pull/1399)] Add a destructive MToon migration in edge case.
+* [[\#1398](https://github.com/vrm-c/UniVRM/pull/1398)] UniVRM-0.90.1
+* [[\#1397](https://github.com/vrm-c/UniVRM/pull/1397)] UniGLTF において、メッシュの Bounds が計算されていなかった問題を修正
+* [[\#1395](https://github.com/vrm-c/UniVRM/pull/1395)] release v0.90.0
diff --git a/retag.sh b/retag.sh
new file mode 100644
index 000000000..c8898ee3f
--- /dev/null
+++ b/retag.sh
@@ -0,0 +1,15 @@
+function retag()
+{
+    echo $1
+    set -x
+    # local
+    if [ `git tag -l | grep -e $1 > /dev/null 2>&1` ];then
+        # remove
+        git tag -d $1
+        git push upstream :$1
+    fi
+    git tag $1
+    git push upstream --tags
+    set +x
+}
+