diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26fbb64..c170daf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [0.12.1] - 2026-02-11
+
+### Fixed
+
+- セッションが見つからない場合に無言で新規セッションに進む問題を修正 — セッション未検出時に info メッセージを表示するように改善
+
+### Internal
+
+- OpenCode プロバイダーの report フェーズを deny に設定（Phase 2 での不要な書き込みを防止）
+- プロジェクト初期化時の `tasks/` ディレクトリコピーをスキップ（TASK-FORMAT が不要になったため）
+- ストリーム診断ユーティリティ (`streamDiagnostics.ts`) を追加
+
 ## [0.12.0] - 2026-02-11
 
 ### Added
diff --git a/package-lock.json b/package-lock.json
index 8d8d0c9..0f1b8a4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "takt",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "takt",
-      "version": "0.12.0",
+      "version": "0.12.1",
       "license": "MIT",
       "dependencies": {
         "@anthropic-ai/claude-agent-sdk": "^0.2.37",
diff --git a/package.json b/package.json
index 2491325..92b5859 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "takt",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "description": "TAKT: TAKT Agent Koordination Topology - AI Agent Piece Orchestration",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",