diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59a0577a2..f8331854c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@
 
 -->
 
-## 12.x.x (unreleased)
+## 12.91.0 (2021/09/22)
 
 ### Improvements
 - ActivityPub: リモートユーザーのDeleteアクティビティに対応
diff --git a/package.json b/package.json
index 763612311..2d0c1cc5f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "misskey",
 	"author": "syuilo <syuilotan@yahoo.co.jp>",
-	"version": "12.90.1",
+	"version": "12.91.0",
 	"codename": "indigo",
 	"repository": {
 		"type": "git",