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diff --git a/en/.doctrees/release/079/v0.91.0.doctree b/en/.doctrees/release/079/v0.91.0.doctree
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diff --git a/en/_sources/release/079/v0.91.0.md.txt b/en/_sources/release/079/v0.91.0.md.txt
new file mode 100644
index 000000000..8aec2abfc
--- /dev/null
+++ b/en/_sources/release/079/v0.91.0.md.txt
@@ -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/en/objects.inv b/en/objects.inv
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diff --git a/en/release/079/index.html b/en/release/079/index.html
index 7053a3119..88c0b65ec 100644
--- a/en/release/079/index.html
+++ b/en/release/079/index.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
@@ -123,6 +124,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
diff --git a/en/release/079/v0.79.0.html b/en/release/079/v0.79.0.html
index d4367908e..0f514f456 100644
--- a/en/release/079/v0.79.0.html
+++ b/en/release/079/v0.79.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.80.0.html b/en/release/079/v0.80.0.html
index b1ca795e3..aca0f610a 100644
--- a/en/release/079/v0.80.0.html
+++ b/en/release/079/v0.80.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.81.0.html b/en/release/079/v0.81.0.html
index 6eb351fe2..78bc0473c 100644
--- a/en/release/079/v0.81.0.html
+++ b/en/release/079/v0.81.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.82.0.html b/en/release/079/v0.82.0.html
index c62e35054..49602ea0b 100644
--- a/en/release/079/v0.82.0.html
+++ b/en/release/079/v0.82.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.83.0.html b/en/release/079/v0.83.0.html
index 8bfbb03db..0ac494fa0 100644
--- a/en/release/079/v0.83.0.html
+++ b/en/release/079/v0.83.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.84.0.html b/en/release/079/v0.84.0.html
index 7fc096055..2d3ff0808 100644
--- a/en/release/079/v0.84.0.html
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@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.85.0.html b/en/release/079/v0.85.0.html
index 46f2bbda1..ae6a0fe0a 100644
--- a/en/release/079/v0.85.0.html
+++ b/en/release/079/v0.85.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.86.0.html b/en/release/079/v0.86.0.html
index 0432473c3..5817939c0 100644
--- a/en/release/079/v0.86.0.html
+++ b/en/release/079/v0.86.0.html
@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.87.0.html b/en/release/079/v0.87.0.html
index 1a9e76e4f..5ec46d2a0 100644
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@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.88.0.html b/en/release/079/v0.88.0.html
index a576695ae..0a9b7e544 100644
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@@ -66,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
diff --git a/en/release/079/v0.89.0.html b/en/release/079/v0.89.0.html
index 47edae6a0..cb9737a5d 100644
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v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
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パッケージ(v0.81~)
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index e96eeef43..2bcf7d15b 100644
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+
@@ -65,6 +66,7 @@
v0.88.0: Road to 1.0.
v0.89.0: 1.0準備
v0.90.0: 1.0準備
+v0.91.0: 1.0準備
パッケージ(v0.81~)
@@ -125,6 +127,7 @@