diff --git a/.claude/skills/working-on-backend/references/knowledge/backend-testing.md b/.claude/skills/working-on-backend/references/knowledge/backend-testing.md
index 10add7d84cc..4cae2b79beb 100644
--- a/.claude/skills/working-on-backend/references/knowledge/backend-testing.md
+++ b/.claude/skills/working-on-backend/references/knowledge/backend-testing.md
@@ -14,7 +14,7 @@ Misskey backend のテスト構成、`.config/test.yml` の前提、e2e テス
 
 ## 前提: `.config/test.yml`
 
-backend のテストスクリプト (`test` / `test:e2e` / `test:fed`) はすべて内部で `cross-env NODE_ENV=test pnpm compile-config` を実行し、`.config/test.yml` を読み込む ([packages/backend/package.json](../../../../../packages/backend/package.json), [packages/backend/scripts/compile_config.js](../../../../../packages/backend/scripts/compile_config.js))。**未作成だとテスト自体が起動しない**。
+backend のテストスクリプト (`test` / `test:e2e` / `test:fed`) はすべて `.config/test.yml` を読み込む。**未作成だとテスト自体が起動しない。**
 
 未作成なら以下を 1 回だけ手動コピーする (どちらでも可):
 
@@ -27,7 +27,6 @@ cp .github/misskey/test.yml .config/test.yml
 補足:
 
 - ルートの `pnpm start:test` (Cypress 用にテストサーバーを起動するコマンド) を使う経路では実行時に `ncp` で自動コピーされる ([package.json](../../../../../package.json))。それ以外で backend テストを直接走らせる時は上記の手動コピーが必要
-- すでに `.config/test.yml` があれば各テストスクリプトの内部 `compile-config` で十分なので、追加で `pnpm --filter backend compile-config` を叩く必要はない
 - `pnpm start:test` は backend e2e テスト (`pnpm --filter backend test:e2e`) の前提ではない (ポート競合の元になるため使わないこと)
 
 ## テスト種別と実行コマンド
diff --git a/.claude/skills/working-on-backend/references/tasks/creating-migration.md b/.claude/skills/working-on-backend/references/tasks/creating-migration.md
index 17653c2998b..671121cca8d 100644
--- a/.claude/skills/working-on-backend/references/tasks/creating-migration.md
+++ b/.claude/skills/working-on-backend/references/tasks/creating-migration.md
@@ -72,7 +72,6 @@ node .claude/skills/working-on-backend/scripts/prepare-generate.mjs
 スクリプトがやること:
 
 - `pnpm build-pre` → `built/meta.json` を生成 (`loadConfig()` が要求)
-- `pnpm --filter backend compile-config` → `built/.config.json` を生成 (`ormconfig.js` の `loadConfig()` が要求するのはこれ。ソースの `.config/default.yml` はその入力なので、無ければ `.config/example.yml` から作っておく)
 - `pnpm --filter backend build` → エンティティを `built/` に反映 (CLI は `built/` を読む)
 - `docker compose -f compose.local-db.yml up -d --wait db` → ローカル DB (postgres) を起動。`--wait` は Docker Compose v2.1.1 (2021-11) 以降が必要 (v2 の `docker compose` 前提。EOL の `docker-compose` v1 は対象外)
 
diff --git a/.claude/skills/working-on-backend/scripts/prepare-generate.mjs b/.claude/skills/working-on-backend/scripts/prepare-generate.mjs
index d502faf6664..58bb3dd602b 100644
--- a/.claude/skills/working-on-backend/scripts/prepare-generate.mjs
+++ b/.claude/skills/working-on-backend/scripts/prepare-generate.mjs
@@ -23,7 +23,7 @@ function step(msg) { console.log(`\n==> ${msg}`); }
 function run(cmd) { console.log(`$ ${cmd}`); execSync(cmd, { stdio: 'inherit' }); }
 function fail(msg) { console.error(`ERROR: ${msg}`); process.exit(1); }
 
-step('1/5 設定ファイルの確認');
+step('1/4 設定ファイルの確認');
 if (!existsSync('.config/default.yml')) {
 	fail([
 		'.config/default.yml が存在しません。',
@@ -46,16 +46,13 @@ if (!existsSync('.config/docker.env')) {
 }
 console.log('OK: .config/default.yml と .config/docker.env あり');
 
-step('2/5 built/meta.json の生成 (build-pre)');
+step('2/4 built/meta.json の生成 (build-pre)');
 run('pnpm build-pre');
 
-step('3/5 設定のコンパイル (compile-config -> built/.config.json)');
-run('pnpm --filter backend compile-config');
-
-step('4/5 backend のビルド (エンティティを built/ へ反映)');
+step('3/4 backend のビルド (エンティティを built/ へ反映)');
 run('pnpm --filter backend build');
 
-step('5/5 ローカル DB の起動 (postgres のみ・healthcheck 完了まで待機)');
+step('4/4 ローカル DB の起動 (postgres のみ・healthcheck 完了まで待機)');
 // migration:generate が必要とするのは postgres だけ。db サービスに絞れば meilisearch.env 等が無くても動く。
 // --wait は compose の pg_isready healthcheck 完了まで待つ。直後の migration:generate が
 // DB 未起動で失敗しないために必須。--wait は Docker Compose v2.1.1 (2021-11) で導入されており、
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index a5aeaaa00a2..dc32f5f9c79 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -67,7 +67,7 @@
 - Migration 差分検査: `pnpm --filter backend check-migrations`
 - `misskey-js` 再生成 (API 変更後必須): `pnpm build-misskey-js-with-types`
 
-**注意:** backend テスト (`test` / `test:e2e` / `test:fed`) 実行前に `.config/test.yml` が必要。未作成の場合は `ncp .github/misskey/test.yml .config/test.yml` (または `cp .github/misskey/test.yml .config/test.yml`) を実行してから走らせる。各テストスクリプトが内部で `cross-env NODE_ENV=test pnpm compile-config` を呼ぶため、コピー済みであれば追加の compile-config は不要。
+**注意:** backend テスト (`test` / `test:e2e` / `test:fed`) 実行前に `.config/test.yml` が必要。未作成の場合は `ncp .github/misskey/test.yml .config/test.yml` (または `cp .github/misskey/test.yml .config/test.yml`) を実行してから走らせる。
 
 変更範囲に応じて最も近いコマンドから優先して検証し、必要なら全体コマンドに広げること。
 
diff --git a/.github/workflows/get-backend-memory.yml b/.github/workflows/get-backend-memory.yml
index aa4bf5e3a45..b87d9f8f11d 100644
--- a/.github/workflows/get-backend-memory.yml
+++ b/.github/workflows/get-backend-memory.yml
@@ -56,8 +56,6 @@ jobs:
       run: git diff --exit-code pnpm-lock.yaml
     - name: Copy Configure
       run: cp .github/misskey/test.yml .config/default.yml
-    - name: Compile Configure
-      run: pnpm compile-config
     - name: Build
       run: pnpm build
     - name: Run migrations
diff --git a/package.json b/package.json
index a6f72faf683..7fbafc4a21a 100644
--- a/package.json
+++ b/package.json
@@ -22,15 +22,14 @@
 	],
 	"private": true,
 	"scripts": {
-		"compile-config": "cd packages/backend && pnpm compile-config",
 		"build-pre": "node scripts/build-pre.mjs",
 		"build-assets": "node ./scripts/build-assets.mjs",
 		"build": "pnpm build-pre && pnpm -r build && pnpm build-assets",
 		"build-storybook": "pnpm --filter frontend build-storybook",
 		"build-misskey-js-with-types": "pnpm build-pre && pnpm --filter backend... --filter=!misskey-js build && pnpm --filter backend generate-api-json --no-build && ncp packages/backend/built/api.json packages/misskey-js/generator/api.json && pnpm --filter misskey-js update-autogen-code && pnpm --filter misskey-js build && pnpm --filter misskey-js api",
-		"start": "cd packages/backend && pnpm compile-config && node ./built/entry.js",
-		"start:inspect": "cd packages/backend && pnpm compile-config && node --inspect ./built/entry.js",
-		"start:test": "ncp ./.github/misskey/test.yml ./.config/test.yml && cd packages/backend && cross-env NODE_ENV=test pnpm compile-config && cross-env NODE_ENV=test node ./built/entry.js",
+		"start": "pnpm check:connect && cd packages/backend && node ./built/entry.js",
+		"start:inspect": "cd packages/backend && node --inspect ./built/entry.js",
+		"start:test": "ncp ./.github/misskey/test.yml ./.config/test.yml && cd packages/backend && cross-env NODE_ENV=test node ./built/entry.js",
 		"cli": "cd packages/backend && pnpm cli",
 		"init": "pnpm migrate",
 		"migrate": "cd packages/backend && pnpm migrate",
diff --git a/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js b/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
index cb8bb33459d..3243f43b915 100644
--- a/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
+++ b/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
@@ -3,15 +3,17 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import {loadConfig} from "./js/migration-config.js";
 
 export class MigrateSomeConfigFileSettingsToMeta1746949539915 {
     name = 'MigrateSomeConfigFileSettingsToMeta1746949539915'
 
     async up(queryRunner) {
+        const config = loadConfig();
         // $1 cannot be used in ALTER TABLE queries
-        await queryRunner.query(`ALTER TABLE "meta" ADD "proxyRemoteFiles" boolean NOT NULL DEFAULT TRUE`);
-        await queryRunner.query(`ALTER TABLE "meta" ADD "signToActivityPubGet" boolean NOT NULL DEFAULT TRUE`);
-        await queryRunner.query(`ALTER TABLE "meta" ADD "allowExternalApRedirect" boolean NOT NULL DEFAULT TRUE`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "proxyRemoteFiles" boolean NOT NULL DEFAULT ${config.proxyRemoteFiles}`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "signToActivityPubGet" boolean NOT NULL DEFAULT ${config.signToActivityPubGet}`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "allowExternalApRedirect" boolean NOT NULL DEFAULT ${!config.disallowExternalApRedirect}`);
     }
 
     async down(queryRunner) {
diff --git a/packages/backend/migration/js/migration-config.js b/packages/backend/migration/js/migration-config.js
new file mode 100644
index 00000000000..853735661bf
--- /dev/null
+++ b/packages/backend/migration/js/migration-config.js
@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { path as configYamlPath } from '../../built/config.js';
+import * as yaml from 'js-yaml';
+import fs from "node:fs";
+
+export function isConcurrentIndexMigrationEnabled() {
+	return process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
+}
+
+let loadedConfigCache = undefined;
+
+function loadConfigInternal() {
+	const config = yaml.load(fs.readFileSync(configYamlPath, 'utf-8'));
+
+	return {
+		disallowExternalApRedirect: Boolean(config.disallowExternalApRedirect ?? false),
+		proxyRemoteFiles: Boolean(config.proxyRemoteFiles ?? false),
+		signToActivityPubGet: Boolean(config.signToActivityPubGet ?? true),
+	}
+}
+
+export function loadConfig() {
+	if (loadedConfigCache === undefined) {
+		loadedConfigCache = loadConfigInternal();
+	}
+	return loadedConfigCache;
+}
diff --git a/packages/backend/ormconfig.js b/packages/backend/ormconfig.js
index dabc0893f40..f979c36ad7f 100644
--- a/packages/backend/ormconfig.js
+++ b/packages/backend/ormconfig.js
@@ -1,8 +1,7 @@
 import { DataSource } from 'typeorm';
 import { loadConfig } from './built/config.js';
 import { entities } from './built/postgres.js';
-
-const isConcurrentIndexMigrationEnabled = process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
+import { isConcurrentIndexMigrationEnabled } from "./migration/js/migration-config.js";
 
 const config = loadConfig();
 
@@ -16,5 +15,5 @@ export default new DataSource({
 	extra: config.db.extra,
 	entities: entities,
 	migrations: ['migration/*.js'],
-	migrationsTransactionMode: isConcurrentIndexMigrationEnabled ? 'each' : 'all',
+	migrationsTransactionMode: isConcurrentIndexMigrationEnabled() ? 'each' : 'all',
 });
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 0ce253a9406..01d78c71d65 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -7,31 +7,30 @@
 		"node": "^22.15.0 || ^24.10.0"
 	},
 	"scripts": {
-		"start": "pnpm compile-config && node ./built/entry.js",
-		"start:inspect": "pnpm compile-config && node --inspect ./built/entry.js",
-		"start:test": "cross-env NODE_ENV=test pnpm compile-config && cross-env NODE_ENV=test node ./built/entry.js",
-		"migrate": "pnpm compile-config && pnpm typeorm migration:run -d ormconfig.js",
-		"revert": "pnpm compile-config && pnpm typeorm migration:revert -d ormconfig.js",
-		"cli": "pnpm compile-config && node ./built/cli.js",
-		"check:connect": "pnpm compile-config && node ./scripts/check_connect.js",
-		"compile-config": "node ./scripts/compile_config.js",
+		"start": "node ./built/entry.js",
+		"start:inspect": "node --inspect ./built/entry.js",
+		"start:test": "cross-env NODE_ENV=test node ./built/entry.js",
+		"migrate": "pnpm typeorm migration:run -d ormconfig.js",
+		"revert": "pnpm typeorm migration:revert -d ormconfig.js",
+		"cli": "node ./built/cli.js",
+		"check:connect": "node ./scripts/check_connect.js",
 		"build": "rolldown -c",
 		"build:unit": "rolldown -c --sourcemap",
 		"build:e2e": "rolldown -c --e2e",
 		"build:tsc": "tsgo -p tsconfig.json && tsc-alias -p tsconfig.json",
-		"watch": "pnpm compile-config && node ./scripts/watch.mjs",
+		"watch": "node ./scripts/watch.mjs",
 		"restart": "pnpm build && pnpm start",
-		"dev": "pnpm compile-config && rolldown -c --watch",
+		"dev": "rolldown -c --watch",
 		"typecheck": "tsgo --noEmit && tsgo -p test --noEmit && tsgo -p test-federation --noEmit",
 		"eslint": "eslint --quiet \"{src,test-federation}/**/*.ts\"",
 		"lint": "pnpm typecheck && pnpm eslint",
-		"test": "pnpm build:unit && cross-env NODE_ENV=test pnpm compile-config && vitest --config vitest.config.unit.ts",
-		"test:e2e": "pnpm build:e2e && cross-env NODE_ENV=test pnpm compile-config && vitest --config vitest.config.e2e.ts",
-		"test:fed": "cross-env NODE_ENV=test pnpm compile-config && vitest --config vitest.config.fed.ts",
-		"test-and-coverage": "pnpm build:unit && cross-env NODE_ENV=test pnpm compile-config && vitest --coverage --config vitest.config.unit.ts",
-		"test-and-coverage:e2e": "pnpm build:e2e && cross-env NODE_ENV=test pnpm compile-config && vitest --coverage --config vitest.config.e2e.ts",
+		"test": "pnpm build:unit && vitest --config vitest.config.unit.ts",
+		"test:e2e": "pnpm build:e2e && vitest --config vitest.config.e2e.ts",
+		"test:fed": "vitest --config vitest.config.fed.ts",
+		"test-and-coverage": "pnpm build:unit && vitest --coverage --config vitest.config.unit.ts",
+		"test-and-coverage:e2e": "pnpm build:e2e && vitest --coverage --config vitest.config.e2e.ts",
 		"check-migrations": "node scripts/check_migrations_clean.js",
-		"generate-api-json": "pnpm compile-config && node ./scripts/generate_api_json.js"
+		"generate-api-json": "node ./scripts/generate_api_json.js"
 	},
 	"optionalDependencies": {
 		"@tensorflow/tfjs": "4.22.0",
@@ -105,6 +104,7 @@
 		"ip-cidr": "4.0.2",
 		"ipaddr.js": "2.4.0",
 		"is-svg": "6.1.0",
+		"js-yaml": "4.1.1",
 		"json5": "2.2.3",
 		"jsonld": "9.0.0",
 		"juice": "11.1.1",
@@ -191,7 +191,6 @@
 		"eslint-plugin-import": "2.32.0",
 		"execa": "9.6.1",
 		"fkill": "10.0.3",
-		"js-yaml": "4.1.1",
 		"pid-port": "2.1.1",
 		"rolldown": "1.0.3",
 		"simple-oauth2": "5.1.0",
diff --git a/packages/backend/scripts/compile_config.js b/packages/backend/scripts/compile_config.js
deleted file mode 100644
index e78fa3dc9f2..00000000000
--- a/packages/backend/scripts/compile_config.js
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-/**
- * YAMLファイルをJSONファイルに変換するスクリプト
- * ビルド前に実行し、ランタイムにjs-yamlを含まないようにする
- */
-
-import fs from 'node:fs';
-import { resolve, dirname } from 'node:path';
-import { fileURLToPath } from 'node:url';
-import yaml from 'js-yaml';
-
-const _filename = fileURLToPath(import.meta.url);
-const _dirname = dirname(_filename);
-
-const configDir = resolve(_dirname, '../../../.config');
-const OUTPUT_PATH = resolve(_dirname, '../../../built/.config.json');
-
-// TODO: yamlのパースに失敗したときのエラーハンドリング
-
-/**
- * YAMLファイルをJSONファイルに変換
- * @param {string} ymlPath - YAMLファイルのパス
- */
-function yamlToJson(ymlPath) {
-	if (!fs.existsSync(ymlPath)) {
-		console.warn(`YAML file not found: ${ymlPath}`);
-		return;
-	}
-
-	console.log(`${ymlPath} → ${OUTPUT_PATH}`);
-
-	const yamlContent = fs.readFileSync(ymlPath, 'utf-8');
-	const jsonContent = yaml.load(yamlContent);
-	if (!fs.existsSync(dirname(OUTPUT_PATH))) {
-		fs.mkdirSync(dirname(OUTPUT_PATH), { recursive: true });
-	}
-	fs.writeFileSync(OUTPUT_PATH, JSON.stringify({
-		'_NOTE_': 'This file is auto-generated from YAML file. DO NOT EDIT.',
-		...jsonContent,
-	}), 'utf-8');
-}
-
-if (process.env.MISSKEY_CONFIG_YML) {
-	const customYmlPath = resolve(configDir, process.env.MISSKEY_CONFIG_YML);
-	yamlToJson(customYmlPath);
-} else {
-	yamlToJson(resolve(configDir, process.env.NODE_ENV === 'test' ? 'test.yml' : 'default.yml'));
-}
-
-console.log('Configuration compiled ✓');
diff --git a/packages/backend/src/config.ts b/packages/backend/src/config.ts
index d67fe6fc6fa..19fdedad44b 100644
--- a/packages/backend/src/config.ts
+++ b/packages/backend/src/config.ts
@@ -6,6 +6,7 @@
 import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname, resolve } from 'node:path';
+import * as yaml from 'js-yaml';
 import { type FastifyServerOptions } from 'fastify';
 import type * as Sentry from '@sentry/node';
 import type * as SentryVue from '@sentry/vue';
@@ -235,23 +236,22 @@ const configDir = resolve(rootDir, '.config');
 /** Path of built directory */
 const projectBuiltDir = resolve(rootDir, 'built');
 
-const compiledConfigFilePathForTest = resolve(projectBuiltDir, '._config_.json');
-
-export const compiledConfigFilePath = fs.existsSync(compiledConfigFilePathForTest)
-	? compiledConfigFilePathForTest
-	: resolve(projectBuiltDir, '.config.json');
+/**
+ * Path of configuration file
+ */
+export const path = process.env.MISSKEY_CONFIG_YML
+	? resolve(configDir, process.env.MISSKEY_CONFIG_YML)
+	: process.env.NODE_ENV === 'test'
+		? resolve(configDir, 'test.yml')
+		: resolve(configDir, 'default.yml');
 
 export function loadConfig(): Config {
-	if (!fs.existsSync(compiledConfigFilePath)) {
-		throw new Error('Compiled configuration file not found. Try running \'pnpm compile-config\'.');
-	}
-
 	const meta = JSON.parse(fs.readFileSync(resolve(projectBuiltDir, 'meta.json'), 'utf-8'));
 
 	const frontendManifestExists = fs.existsSync(resolve(projectBuiltDir, '_frontend_vite_/manifest.json'));
 	const frontendEmbedManifestExists = fs.existsSync(resolve(projectBuiltDir, '_frontend_embed_vite_/manifest.json'));
 
-	const config = JSON.parse(fs.readFileSync(compiledConfigFilePath, 'utf-8')) as Source;
+	const config = yaml.load(fs.readFileSync(path, 'utf-8')) as Source;
 
 	const url = tryCreateUrl(config.url ?? process.env.MISSKEY_URL ?? '');
 	const version = meta.version;
diff --git a/packages/backend/test-federation/.config/dummy.yml b/packages/backend/test-federation/.config/dummy.yml
deleted file mode 100644
index 841cab97832..00000000000
--- a/packages/backend/test-federation/.config/dummy.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-url: https://example.com/
-port: 3000
diff --git a/packages/backend/test-federation/.config/example.config.json b/packages/backend/test-federation/.config/example.config.json
deleted file mode 100644
index 2035d1a2009..00000000000
--- a/packages/backend/test-federation/.config/example.config.json
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-  "url": "https://${HOST}/",
-  "port": 3000,
-  "db": {
-    "host": "db.${HOST}",
-    "port": 5432,
-    "db": "misskey",
-    "user": "postgres",
-    "pass": "postgres"
-  },
-  "dbReplications": false,
-  "trustProxy": true,
-  "redis": {
-    "host": "redis.test",
-    "port": 6379
-  },
-  "id": "aidx",
-  "proxyBypassHosts": [
-    "api.deepl.com",
-    "api-free.deepl.com",
-    "www.recaptcha.net",
-    "hcaptcha.com",
-    "challenges.cloudflare.com"
-  ],
-  "allowedPrivateNetworks": [
-    "127.0.0.1/32",
-    "172.20.0.0/16"
-  ]
-}
diff --git a/packages/backend/test-federation/.config/example.default.yml b/packages/backend/test-federation/.config/example.default.yml
new file mode 100644
index 00000000000..b1cd3bdba82
--- /dev/null
+++ b/packages/backend/test-federation/.config/example.default.yml
@@ -0,0 +1,23 @@
+url: https://${HOST}/
+port: 3000
+db:
+  host: db.${HOST}
+  port: 5432
+  db: misskey
+  user: postgres
+  pass: postgres
+dbReplications: false
+trustProxy: true
+redis:
+  host: redis.test
+  port: 6379
+id: 'aidx'
+proxyBypassHosts:
+  - api.deepl.com
+  - api-free.deepl.com
+  - www.recaptcha.net
+  - hcaptcha.com
+  - challenges.cloudflare.com
+allowedPrivateNetworks:
+  - 127.0.0.1/32
+  - 172.20.0.0/16
diff --git a/packages/backend/test-federation/compose.a.yml b/packages/backend/test-federation/compose.a.yml
index ec9a2cf2afd..433ee5c5e9d 100644
--- a/packages/backend/test-federation/compose.a.yml
+++ b/packages/backend/test-federation/compose.a.yml
@@ -37,8 +37,8 @@ services:
       - internal_network_a
     volumes:
       - type: bind
-        source: ./.config/a.test.config.json
-        target: /misskey/built/._config_.json
+        source: ./.config/a.test.default.yml
+        target: /misskey/.config/default.yml
         read_only: true
 
   db.a.test:
diff --git a/packages/backend/test-federation/compose.b.yml b/packages/backend/test-federation/compose.b.yml
index 92219344069..38e9bb738ba 100644
--- a/packages/backend/test-federation/compose.b.yml
+++ b/packages/backend/test-federation/compose.b.yml
@@ -37,8 +37,8 @@ services:
       - internal_network_b
     volumes:
       - type: bind
-        source: ./.config/b.test.config.json
-        target: /misskey/built/._config_.json
+        source: ./.config/b.test.default.yml
+        target: /misskey/.config/default.yml
         read_only: true
 
   db.b.test:
diff --git a/packages/backend/test-federation/compose.tpl.yml b/packages/backend/test-federation/compose.tpl.yml
index d5e87cc47c8..6650dcace3a 100644
--- a/packages/backend/test-federation/compose.tpl.yml
+++ b/packages/backend/test-federation/compose.tpl.yml
@@ -21,10 +21,6 @@ services:
       - type: bind
         source: ../../../built
         target: /misskey/built
-        read_only: false
-      - type: bind
-        source: ./.config/dummy.yml
-        target: /misskey/.config/default.yml
         read_only: true
       - type: bind
         source: ../assets
@@ -50,10 +46,6 @@ services:
         source: ../package.json
         target: /misskey/packages/backend/package.json
         read_only: true
-      - type: bind
-        source: ../scripts/compile_config.js
-        target: /misskey/packages/backend/scripts/compile_config.js
-        read_only: true
       - type: bind
         source: ../../misskey-js/built
         target: /misskey/packages/misskey-js/built
diff --git a/packages/backend/test-federation/compose.yml b/packages/backend/test-federation/compose.yml
index 53e297f8678..2d01fe423b6 100644
--- a/packages/backend/test-federation/compose.yml
+++ b/packages/backend/test-federation/compose.yml
@@ -50,10 +50,6 @@ services:
         source: ../vitest.config.fed.ts
         target: /misskey/packages/backend/vitest.config.fed.ts
         read_only: true
-      - type: bind
-        source: ../scripts/compile_config.js
-        target: /misskey/packages/backend/scripts/compile_config.js
-        read_only: true
       - type: bind
         source: ../../misskey-js/built
         target: /misskey/packages/misskey-js/built
diff --git a/packages/backend/test-federation/setup.sh b/packages/backend/test-federation/setup.sh
index 15aa2eee7f3..1bc3a2a87c0 100644
--- a/packages/backend/test-federation/setup.sh
+++ b/packages/backend/test-federation/setup.sh
@@ -28,7 +28,7 @@ function generate {
     -days 500
   if [ ! -f .config/docker.env ]; then cp .config/example.docker.env .config/docker.env; fi
   if [ ! -f .config/$1.conf ]; then sed "s/\${HOST}/$1/g" .config/example.conf > .config/$1.conf; fi
-  if [ ! -f .config/$1.default.yml ]; then sed "s/\${HOST}/$1/g" .config/example.config.json > .config/$1.config.json; fi
+  if [ ! -f .config/$1.default.yml ]; then sed "s/\${HOST}/$1/g" .config/example.default.yml > .config/$1.default.yml; fi
 }
 
 generate a.test
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 283835bf519..44170b267b4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -246,6 +246,9 @@ importers:
       is-svg:
         specifier: 6.1.0
         version: 6.1.0
+      js-yaml:
+        specifier: 4.1.1
+        version: 4.1.1
       json5:
         specifier: 2.2.3
         version: 2.2.3
@@ -499,9 +502,6 @@ importers:
       fkill:
         specifier: 10.0.3
         version: 10.0.3
-      js-yaml:
-        specifier: 4.1.1
-        version: 4.1.1
       pid-port:
         specifier: 2.1.1
         version: 2.1.1