diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d93d93624..06c157284b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## Unreleased
+## 2025.12.2
 
 ### Note
 v2025.12.0で行われた「configの`trustProxy`のデフォルト値を`false`に変更」について、正しく環境に応じた設定を行わないとサインインが困難になるといった状態を緩和するために、以前のデフォルト値に戻す暫定対応を行いました。
diff --git a/package.json b/package.json
index 31b489949f..b883c859f9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "misskey",
-	"version": "2025.12.1",
+	"version": "2025.12.2-alpha.0",
 	"codename": "nasubi",
 	"repository": {
 		"type": "git",
diff --git a/packages/misskey-js/package.json b/packages/misskey-js/package.json
index 4b64b6ea0b..74308d5e56 100644
--- a/packages/misskey-js/package.json
+++ b/packages/misskey-js/package.json
@@ -1,7 +1,7 @@
 {
 	"type": "module",
 	"name": "misskey-js",
-	"version": "2025.12.1",
+	"version": "2025.12.2-alpha.0",
 	"description": "Misskey SDK for JavaScript",
 	"license": "MIT",
 	"main": "./built/index.js",