diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index e800743469..514abdfb20 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -5,7 +5,7 @@
 	"workspaceFolder": "/workspace",
 	"features": {
 		"ghcr.io/devcontainers/features/node:1": {
-			"version": "24.10.0"
+			"version": "22.15.0"
 		},
 		"ghcr.io/devcontainers-extra/features/pnpm:2": {
 			"version": "10.10.0"
diff --git a/.node-version b/.node-version
index 21651351e2..b8ffd70759 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1 @@
-24.10.0
+22.15.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b08a76093..665f42f5b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,6 @@
 ## Unreleased
 
 ### General
-- Enhance: Node.js 24.10.0をサポートするようになりました
-- Enhance: DockerのNode.jsが24.10.0に更新されました
 
 ### Client
 - Fix: 紙吹雪エフェクトがアニメーション設定を考慮せず常に表示される問題を修正
diff --git a/Dockerfile b/Dockerfile
index 20e24d1dc2..370bed5751 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # syntax = docker/dockerfile:1.4
 
-ARG NODE_VERSION=24.10.0-bookworm
+ARG NODE_VERSION=22.15.0-bookworm
 
 # build assets & compile TypeScript
 
diff --git a/packages/backend/package.json b/packages/backend/package.json
index dff9fe22cd..afee92fe38 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -4,7 +4,7 @@
 	"private": true,
 	"type": "module",
 	"engines": {
-		"node": "^22.15.0 || ^24.10.0"
+		"node": "^22.15.0"
 	},
 	"scripts": {
 		"start": "node ./built/boot/entry.js",