diff --git a/packages/backend/src/db/postgre.ts b/packages/backend/src/db/postgre.ts
index 6dd8fa30f..0a1d24843 100644
--- a/packages/backend/src/db/postgre.ts
+++ b/packages/backend/src/db/postgre.ts
@@ -75,7 +75,6 @@ import { NoteEdit } from "@/models/entities/note-edit.js";
 import { entities as charts } from "@/services/chart/entities.js";
 import { envOption } from "../env.js";
 import { dbLogger } from "./logger.js";
-import { redisClient } from "./redis.js";
 import { OAuthApp } from "@/models/entities/oauth-app.js";
 import { OAuthToken } from "@/models/entities/oauth-token.js";
 
@@ -238,6 +237,7 @@ export async function initDb(force = false) {
 
 export async function resetDb() {
 	const reset = async () => {
+		const { redisClient } = await import("./redis.js");
 		await redisClient.flushdb();
 		const tables = await db.query(`SELECT relname AS "table"
 		FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
diff --git a/packages/backend/src/migration/1695749948350-move-antenna-to-cache.ts b/packages/backend/src/migration/1695749948350-move-antenna-to-cache.ts
index 68d4bc566..a6ea0eee4 100644
--- a/packages/backend/src/migration/1695749948350-move-antenna-to-cache.ts
+++ b/packages/backend/src/migration/1695749948350-move-antenna-to-cache.ts
@@ -1,5 +1,4 @@
 import { MigrationInterface, QueryRunner } from "typeorm";
-import { redisClient } from "../db/redis.js";
 
 export class MoveAntennaToCache1695749948350 implements MigrationInterface {
 	name = "MoveAntennaToCache1695749948350";
@@ -19,6 +18,7 @@ export class MoveAntennaToCache1695749948350 implements MigrationInterface {
 			console.log('ANTENNA_MIGRATION_SKIP = true, skipping antenna note migration');
 		}
 		else {
+			const { redisClient } = await import("../db/redis.js");
 			const total = await queryRunner.query(`SELECT COUNT(1) FROM "antenna_note"`)
 				.then(p => p[0]['count']);
 
@@ -41,6 +41,8 @@ export class MoveAntennaToCache1695749948350 implements MigrationInterface {
 
 				query = `SELECT "id", "noteId", "antennaId" FROM "antenna_note" WHERE "id" > '${res.at(-1).id}' ORDER BY "id" ASC LIMIT ${Math.min(readLimit, remaining)}`;
 			}
+
+			redisClient.quit();
 		}
 
 		await queryRunner.query(`DROP TABLE IF EXISTS "antenna_note"`);
diff --git a/packages/backend/src/services/chart/core.ts b/packages/backend/src/services/chart/core.ts
index 36fe37326..812421271 100644
--- a/packages/backend/src/services/chart/core.ts
+++ b/packages/backend/src/services/chart/core.ts
@@ -15,7 +15,6 @@ import {
 	subtractTime,
 	addTime,
 } from "@/prelude/time.js";
-import { getChartInsertLock } from "@/misc/app-lock.js";
 import { db } from "@/db/postgre.js";
 import promiseLimit from "promise-limit";
 
@@ -430,6 +429,7 @@ export default abstract class Chart<T extends Schema> {
 			? `${this.name}:${date}:${span}:${group}`
 			: `${this.name}:${date}:${span}`;
 
+		const { getChartInsertLock } = await import("@/misc/app-lock.js");
 		const unlock = await getChartInsertLock(lockKey);
 		try {
 			// ロック内でもう1回チェックする