diff --git a/packages/backend/check_connect.js b/packages/backend/check_connect.js
index ef0a350fbf..ce31bd8fb6 100644
--- a/packages/backend/check_connect.js
+++ b/packages/backend/check_connect.js
@@ -1,4 +1,4 @@
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { loadConfig } from './built/config.js';
 
 const config = loadConfig();
diff --git a/packages/backend/src/GlobalModule.ts b/packages/backend/src/GlobalModule.ts
index 174d0d8beb..4574429c43 100644
--- a/packages/backend/src/GlobalModule.ts
+++ b/packages/backend/src/GlobalModule.ts
@@ -1,6 +1,6 @@
 import { setTimeout } from 'node:timers/promises';
 import { Global, Inject, Module } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DataSource } from 'typeorm';
 import { DI } from './di-symbols.js';
 import { loadConfig } from './config.js';
@@ -25,7 +25,7 @@ const $db: Provider = {
 const $redis: Provider = {
 	provide: DI.redis,
 	useFactory: (config) => {
-		return new Redis({
+		return new Redis.Redis({
 			port: config.redis.port,
 			host: config.redis.host,
 			family: config.redis.family == null ? 0 : config.redis.family,
@@ -40,7 +40,7 @@ const $redis: Provider = {
 const $redisForPub: Provider = {
 	provide: DI.redisForPub,
 	useFactory: (config) => {
-		const redis = new Redis({
+		const redis = new Redis.Redis({
 			port: config.redisForPubsub.port,
 			host: config.redisForPubsub.host,
 			family: config.redisForPubsub.family == null ? 0 : config.redisForPubsub.family,
@@ -56,7 +56,7 @@ const $redisForPub: Provider = {
 const $redisForSub: Provider = {
 	provide: DI.redisForSub,
 	useFactory: (config) => {
-		const redis = new Redis({
+		const redis = new Redis.Redis({
 			port: config.redisForPubsub.port,
 			host: config.redisForPubsub.host,
 			family: config.redisForPubsub.family == null ? 0 : config.redisForPubsub.family,
diff --git a/packages/backend/src/core/AntennaService.ts b/packages/backend/src/core/AntennaService.ts
index 166c78f479..2d4226a32d 100644
--- a/packages/backend/src/core/AntennaService.ts
+++ b/packages/backend/src/core/AntennaService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { Antenna } from '@/models/entities/Antenna.js';
 import type { Note } from '@/models/entities/Note.js';
 import type { User } from '@/models/entities/User.js';
diff --git a/packages/backend/src/core/AppLockService.ts b/packages/backend/src/core/AppLockService.ts
index ee179b7f01..8dd805552b 100644
--- a/packages/backend/src/core/AppLockService.ts
+++ b/packages/backend/src/core/AppLockService.ts
@@ -1,7 +1,7 @@
 import { promisify } from 'node:util';
 import { Inject, Injectable } from '@nestjs/common';
 import redisLock from 'redis-lock';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 
diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
index 561face5c3..cf1e81ffc8 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { BlockingsRepository, ChannelFollowingsRepository, FollowingsRepository, MutingsRepository, RenoteMutingsRepository, UserProfile, UserProfilesRepository, UsersRepository } from '@/models/index.js';
 import { MemoryKVCache, RedisKVCache } from '@/misc/cache.js';
 import type { LocalUser, User } from '@/models/entities/User.js';
diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index 185171dee2..4ffa179cab 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { DataSource, In, IsNull } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import { IdService } from '@/core/IdService.js';
 import { EmojiEntityService } from '@/core/entities/EmojiEntityService.js';
diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index 56660ae0d0..e028265bdc 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { InstancesRepository } from '@/models/index.js';
 import type { Instance } from '@/models/entities/Instance.js';
 import { MemoryKVCache, RedisKVCache } from '@/misc/cache.js';
diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index 2c2687a90c..0ed5241148 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { User } from '@/models/entities/User.js';
 import type { Note } from '@/models/entities/Note.js';
 import type { UserList } from '@/models/entities/UserList.js';
diff --git a/packages/backend/src/core/MetaService.ts b/packages/backend/src/core/MetaService.ts
index 1322927c2c..0b861be8d0 100644
--- a/packages/backend/src/core/MetaService.ts
+++ b/packages/backend/src/core/MetaService.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import { Meta } from '@/models/entities/Meta.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 79629cb2a8..50081f831b 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -1,7 +1,7 @@
 import { setImmediate } from 'node:timers/promises';
 import * as mfm from 'mfm-js';
 import { In, DataSource } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
 import { extractMentions } from '@/misc/extract-mentions.js';
 import { extractCustomEmojisFromMfm } from '@/misc/extract-custom-emojis-from-mfm.js';
diff --git a/packages/backend/src/core/NotificationService.ts b/packages/backend/src/core/NotificationService.ts
index 6691c42836..a245908c98 100644
--- a/packages/backend/src/core/NotificationService.ts
+++ b/packages/backend/src/core/NotificationService.ts
@@ -1,5 +1,5 @@
 import { setTimeout } from 'node:timers/promises';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
 import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
@@ -111,7 +111,7 @@ export class NotificationService implements OnApplicationShutdown {
 		// 2秒経っても(今回作成した)通知が既読にならなかったら「未読の通知がありますよ」イベントを発行する
 		setTimeout(2000, 'unread notification', { signal: this.#shutdownController.signal }).then(async () => {
 			const latestReadNotificationId = await this.redisClient.get(`latestReadNotification:${notifieeId}`);
-			if (latestReadNotificationId && (latestReadNotificationId >= await redisIdPromise)) return;
+			if (latestReadNotificationId && (latestReadNotificationId >= (await redisIdPromise)!)) return;
 
 			this.globalEventService.publishMainStream(notifieeId, 'unreadNotification', packed);
 			this.pushNotificationService.pushNotification(notifieeId, 'notification', packed);
diff --git a/packages/backend/src/core/PushNotificationService.ts b/packages/backend/src/core/PushNotificationService.ts
index 9b44cf6413..a4c569bdec 100644
--- a/packages/backend/src/core/PushNotificationService.ts
+++ b/packages/backend/src/core/PushNotificationService.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import push from 'web-push';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { Packed } from '@/misc/json-schema';
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 2a4271aa98..3878c147d0 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { In } from 'typeorm';
 import type { Role, RoleAssignment, RoleAssignmentsRepository, RolesRepository, UsersRepository } from '@/models/index.js';
 import { MemoryKVCache, MemorySingleCache } from '@/misc/cache.js';
diff --git a/packages/backend/src/core/UserKeypairService.ts b/packages/backend/src/core/UserKeypairService.ts
index 22a9fb2b8e..72c35c529c 100644
--- a/packages/backend/src/core/UserKeypairService.ts
+++ b/packages/backend/src/core/UserKeypairService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { User } from '@/models/entities/User.js';
 import type { UserKeypairsRepository } from '@/models/index.js';
 import { RedisKVCache } from '@/misc/cache.js';
diff --git a/packages/backend/src/core/WebhookService.ts b/packages/backend/src/core/WebhookService.ts
index 926115613b..57baade777 100644
--- a/packages/backend/src/core/WebhookService.ts
+++ b/packages/backend/src/core/WebhookService.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import type { WebhooksRepository } from '@/models/index.js';
 import type { Webhook } from '@/models/entities/Webhook.js';
 import { DI } from '@/di-symbols.js';
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 51e6b1d7ab..2c67cb772b 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { In, Not } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import Ajv from 'ajv';
 import { ModuleRef } from '@nestjs/core';
 import { DI } from '@/di-symbols.js';
diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index f413246a1f..5610929648 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -1,4 +1,4 @@
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { bindThis } from '@/decorators.js';
 
 export class RedisKVCache<T> {
@@ -38,7 +38,7 @@ export class RedisKVCache<T> {
 			await this.redisClient.set(
 				`kvcache:${this.name}:${key}`,
 				this.toRedisConverter(value),
-				'ex', Math.round(this.lifetime / 1000),
+				'EX', Math.round(this.lifetime / 1000),
 			);
 		}
 	}
@@ -122,7 +122,7 @@ export class RedisSingleCache<T> {
 			await this.redisClient.set(
 				`singlecache:${this.name}`,
 				this.toRedisConverter(value),
-				'ex', Math.round(this.lifetime / 1000),
+				'EX', Math.round(this.lifetime / 1000),
 			);
 		}
 	}
diff --git a/packages/backend/src/server/api/RateLimiterService.ts b/packages/backend/src/server/api/RateLimiterService.ts
index 1f8915ecca..fe2db1d66a 100644
--- a/packages/backend/src/server/api/RateLimiterService.ts
+++ b/packages/backend/src/server/api/RateLimiterService.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import Limiter from 'ratelimiter';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import type Logger from '@/logger.js';
 import { LoggerService } from '@/core/LoggerService.js';
diff --git a/packages/backend/src/server/api/StreamingApiServerService.ts b/packages/backend/src/server/api/StreamingApiServerService.ts
index 769a4490d6..258e8de034 100644
--- a/packages/backend/src/server/api/StreamingApiServerService.ts
+++ b/packages/backend/src/server/api/StreamingApiServerService.ts
@@ -1,6 +1,6 @@
 import { EventEmitter } from 'events';
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import * as websocket from 'websocket';
 import { DI } from '@/di-symbols.js';
 import type { UsersRepository, BlockingsRepository, ChannelFollowingsRepository, FollowingsRepository, MutingsRepository, UserProfilesRepository, RenoteMutingsRepository } from '@/models/index.js';
diff --git a/packages/backend/src/server/api/endpoints/admin/server-info.ts b/packages/backend/src/server/api/endpoints/admin/server-info.ts
index 9c576dffe9..4ef4fdc665 100644
--- a/packages/backend/src/server/api/endpoints/admin/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/admin/server-info.ts
@@ -2,7 +2,7 @@ import * as os from 'node:os';
 import si from 'systeminformation';
 import { Inject, Injectable } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { DI } from '@/di-symbols.js';
 
diff --git a/packages/backend/src/server/api/endpoints/antennas/notes.ts b/packages/backend/src/server/api/endpoints/antennas/notes.ts
index 88623ce26a..dca0f443b7 100644
--- a/packages/backend/src/server/api/endpoints/antennas/notes.ts
+++ b/packages/backend/src/server/api/endpoints/antennas/notes.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { NotesRepository, AntennasRepository } from '@/models/index.js';
 import { QueryService } from '@/core/QueryService.js';
diff --git a/packages/backend/src/server/api/endpoints/channels/timeline.ts b/packages/backend/src/server/api/endpoints/channels/timeline.ts
index 2491d14235..c881074bab 100644
--- a/packages/backend/src/server/api/endpoints/channels/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/channels/timeline.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { ChannelsRepository, Note, NotesRepository } from '@/models/index.js';
 import { QueryService } from '@/core/QueryService.js';
diff --git a/packages/backend/src/server/api/endpoints/i/notifications.ts b/packages/backend/src/server/api/endpoints/i/notifications.ts
index ba0487f223..e141be764a 100644
--- a/packages/backend/src/server/api/endpoints/i/notifications.ts
+++ b/packages/backend/src/server/api/endpoints/i/notifications.ts
@@ -1,5 +1,5 @@
 import { Brackets, In } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Inject, Injectable } from '@nestjs/common';
 import type { UsersRepository, FollowingsRepository, MutingsRepository, UserProfilesRepository, NotesRepository } from '@/models/index.js';
 import { obsoleteNotificationTypes, notificationTypes } from '@/types.js';
diff --git a/packages/backend/src/server/api/endpoints/reset-db.ts b/packages/backend/src/server/api/endpoints/reset-db.ts
index 655dd7cd83..4ced6d3ff1 100644
--- a/packages/backend/src/server/api/endpoints/reset-db.ts
+++ b/packages/backend/src/server/api/endpoints/reset-db.ts
@@ -1,6 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { DataSource } from 'typeorm';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { DI } from '@/di-symbols.js';
 import { resetDb } from '@/misc/reset-db.js';
diff --git a/packages/backend/src/server/api/endpoints/roles/notes.ts b/packages/backend/src/server/api/endpoints/roles/notes.ts
index b45d4af1fe..90c8281a49 100644
--- a/packages/backend/src/server/api/endpoints/roles/notes.ts
+++ b/packages/backend/src/server/api/endpoints/roles/notes.ts
@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
-import Redis from 'ioredis';
+import * as Redis from 'ioredis';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import type { NotesRepository, RolesRepository } from '@/models/index.js';
 import { QueryService } from '@/core/QueryService.js';