diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index c2695aa78..588931ff1 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -6,8 +6,8 @@ export class Cache<T> {
 	private ttl: number;
 	private prefix: string;
 
-	constructor(prefix: string, ttl: number) {
-		this.ttl = ttl;
+	constructor(prefix: string, ttlSeconds: number) {
+		this.ttl = ttlSeconds;
 		this.prefix = `cache:${prefix}`;
 	}
 
@@ -15,26 +15,28 @@ export class Cache<T> {
 		return key ? `${this.prefix}:${key}` : this.prefix;
 	}
 
-	public async set(key: string | null, value: T, transaction?: ChainableCommander): Promise<void> {
+	public async set(
+		key: string | null,
+		value: T,
+		transaction?: ChainableCommander,
+	): Promise<void> {
 		const _key = this.prefixedKey(key);
 		const _value = Buffer.from(encode(value));
 		const commander = transaction ?? redisClient;
-		if (this.ttl === Infinity) {
-			await commander.set(_key, _value);
-		} else {
-			await commander.set(_key, _value, "PX", this.ttl);
-		}
+		await commander.set(_key, _value, "EX", this.ttl);
 	}
 
-	public async get(key: string | null): Promise<T | undefined> {
+	public async get(key: string | null, renew = false): Promise<T | undefined> {
 		const _key = this.prefixedKey(key);
 		const cached = await redisClient.getBuffer(_key);
 		if (cached === null) return undefined;
 
+		if (renew) await redisClient.expire(_key, this.ttl);
+
 		return decode(cached) as T;
 	}
 
-	public async getAll(): Promise<Map<string, T>> {
+	public async getAll(renew = false): Promise<Map<string, T>> {
 		const keys = await redisClient.keys(`${this.prefix}*`);
 		const map = new Map<string, T>();
 		if (keys.length === 0) {
@@ -49,6 +51,14 @@ export class Cache<T> {
 			}
 		}
 
+		if (renew) {
+			const trans = redisClient.multi();
+			for (const key of map.keys()) {
+				trans.expire(key, this.ttl);
+			}
+			await trans.exec();
+		}
+
 		return map;
 	}
 
@@ -66,9 +76,10 @@ export class Cache<T> {
 	public async fetch(
 		key: string | null,
 		fetcher: () => Promise<T>,
+		renew = false,
 		validator?: (cachedValue: T) => boolean,
 	): Promise<T> {
-		const cachedValue = await this.get(key);
+		const cachedValue = await this.get(key, renew);
 		if (cachedValue !== undefined) {
 			if (validator) {
 				if (validator(cachedValue)) {
@@ -94,9 +105,10 @@ export class Cache<T> {
 	public async fetchMaybe(
 		key: string | null,
 		fetcher: () => Promise<T | undefined>,
+		renew = false,
 		validator?: (cachedValue: T) => boolean,
 	): Promise<T | undefined> {
-		const cachedValue = await this.get(key);
+		const cachedValue = await this.get(key, renew);
 		if (cachedValue !== undefined) {
 			if (validator) {
 				if (validator(cachedValue)) {
diff --git a/packages/backend/src/misc/check-hit-antenna.ts b/packages/backend/src/misc/check-hit-antenna.ts
index c422cca94..1ff09d629 100644
--- a/packages/backend/src/misc/check-hit-antenna.ts
+++ b/packages/backend/src/misc/check-hit-antenna.ts
@@ -11,7 +11,7 @@ import * as Acct from "@/misc/acct.js";
 import type { Packed } from "./schema.js";
 import { Cache } from "./cache.js";
 
-const blockingCache = new Cache<User["id"][]>("blocking", 1000 * 60 * 5);
+const blockingCache = new Cache<User["id"][]>("blocking", 60 * 5);
 
 // NOTE: フォローしているユーザーのノート、リストのユーザーのノート、グループのユーザーのノート指定はパフォーマンス上の理由で無効になっている
 
diff --git a/packages/backend/src/misc/emoji-meta.ts b/packages/backend/src/misc/emoji-meta.ts
index d2d15411f..2b9365b82 100644
--- a/packages/backend/src/misc/emoji-meta.ts
+++ b/packages/backend/src/misc/emoji-meta.ts
@@ -11,7 +11,7 @@ export type Size = {
 	height: number;
 };
 
-const cache = new Cache<boolean>("emojiMeta",1000 * 60 * 10); // once every 10 minutes for the same url
+const cache = new Cache<boolean>("emojiMeta", 60 * 10); // once every 10 minutes for the same url
 const logger = new Logger("emoji");
 
 export async function getEmojiSize(url: string): Promise<Size> {
diff --git a/packages/backend/src/misc/keypair-store.ts b/packages/backend/src/misc/keypair-store.ts
index b0e07c4ab..625577359 100644
--- a/packages/backend/src/misc/keypair-store.ts
+++ b/packages/backend/src/misc/keypair-store.ts
@@ -3,10 +3,12 @@ import type { User } from "@/models/entities/user.js";
 import type { UserKeypair } from "@/models/entities/user-keypair.js";
 import { Cache } from "./cache.js";
 
-const cache = new Cache<UserKeypair>("keypairStore", Infinity);
+const cache = new Cache<UserKeypair>("keypairStore", 60 * 30);
 
 export async function getUserKeypair(userId: User["id"]): Promise<UserKeypair> {
-	return await cache.fetch(userId, () =>
-		UserKeypairs.findOneByOrFail({ userId: userId }),
+	return await cache.fetch(
+		userId,
+		() => UserKeypairs.findOneByOrFail({ userId: userId }),
+		true,
 	);
 }
diff --git a/packages/backend/src/misc/populate-emojis.ts b/packages/backend/src/misc/populate-emojis.ts
index e6e6c2fb9..795a267f9 100644
--- a/packages/backend/src/misc/populate-emojis.ts
+++ b/packages/backend/src/misc/populate-emojis.ts
@@ -9,7 +9,7 @@ import config from "@/config/index.js";
 import { query } from "@/prelude/url.js";
 import { redisClient } from "@/db/redis.js";
 
-const cache = new Cache<Emoji | null>("populateEmojis", 1000 * 60 * 60 * 12);
+const cache = new Cache<Emoji | null>("populateEmojis", 60 * 60 * 12);
 
 /**
  * 添付用絵文字情報
diff --git a/packages/backend/src/models/repositories/user.ts b/packages/backend/src/models/repositories/user.ts
index 2bd8d4fba..5ca36e3d3 100644
--- a/packages/backend/src/models/repositories/user.ts
+++ b/packages/backend/src/models/repositories/user.ts
@@ -1,4 +1,3 @@
-import { URL } from "url";
 import { In, Not } from "typeorm";
 import Ajv from "ajv";
 import type { ILocalUser, IRemoteUser } from "@/models/entities/user.js";
@@ -40,7 +39,10 @@ import {
 } from "../index.js";
 import type { Instance } from "../entities/instance.js";
 
-const userInstanceCache = new Cache<Instance | null>("userInstance", 1000 * 60 * 60 * 3);
+const userInstanceCache = new Cache<Instance | null>(
+	"userInstance",
+	60 * 60 * 3,
+);
 
 type IsUserDetailed<Detailed extends boolean> = Detailed extends true
 	? Packed<"UserDetailed">
diff --git a/packages/backend/src/remote/activitypub/db-resolver.ts b/packages/backend/src/remote/activitypub/db-resolver.ts
index 4b4ea9627..a710b9f11 100644
--- a/packages/backend/src/remote/activitypub/db-resolver.ts
+++ b/packages/backend/src/remote/activitypub/db-resolver.ts
@@ -5,7 +5,6 @@ import type {
 	CacheableRemoteUser,
 	CacheableUser,
 } from "@/models/entities/user.js";
-import { User, IRemoteUser } from "@/models/entities/user.js";
 import type { UserPublickey } from "@/models/entities/user-publickey.js";
 import type { MessagingMessage } from "@/models/entities/messaging-message.js";
 import {
@@ -20,8 +19,11 @@ import type { IObject } from "./type.js";
 import { getApId } from "./type.js";
 import { resolvePerson } from "./models/person.js";
 
-const publicKeyCache = new Cache<UserPublickey | null>("publicKey", Infinity);
-const publicKeyByUserIdCache = new Cache<UserPublickey | null>("publicKeyByUserId", Infinity);
+const publicKeyCache = new Cache<UserPublickey | null>("publicKey", 60 * 30);
+const publicKeyByUserIdCache = new Cache<UserPublickey | null>(
+	"publicKeyByUserId",
+	60 * 30,
+);
 
 export type UriParseResult =
 	| {
@@ -123,17 +125,23 @@ export default class DbResolver {
 			if (parsed.type !== "users") return null;
 
 			return (
-				(await userByIdCache.fetchMaybe(parsed.id, () =>
-					Users.findOneBy({
-						id: parsed.id,
-					}).then((x) => x ?? undefined),
+				(await userByIdCache.fetchMaybe(
+					parsed.id,
+					() =>
+						Users.findOneBy({
+							id: parsed.id,
+						}).then((x) => x ?? undefined),
+					true,
 				)) ?? null
 			);
 		} else {
-			return await uriPersonCache.fetch(parsed.uri, () =>
-				Users.findOneBy({
-					uri: parsed.uri,
-				}),
+			return await uriPersonCache.fetch(
+				parsed.uri,
+				() =>
+					Users.findOneBy({
+						uri: parsed.uri,
+					}),
+				true,
 			);
 		}
 	}
@@ -156,14 +164,17 @@ export default class DbResolver {
 
 				return key;
 			},
+			true,
 			(key) => key != null,
 		);
 
 		if (key == null) return null;
 
 		return {
-			user: (await userByIdCache.fetch(key.userId, () =>
-				Users.findOneByOrFail({ id: key.userId }),
+			user: (await userByIdCache.fetch(
+				key.userId,
+				() => Users.findOneByOrFail({ id: key.userId }),
+				true,
 			)) as CacheableRemoteUser,
 			key,
 		};
@@ -183,6 +194,7 @@ export default class DbResolver {
 		const key = await publicKeyByUserIdCache.fetch(
 			user.id,
 			() => UserPublickeys.findOneBy({ userId: user.id }),
+			true,
 			(v) => v != null,
 		);
 
diff --git a/packages/backend/src/remote/activitypub/models/person.ts b/packages/backend/src/remote/activitypub/models/person.ts
index c541e9ae5..c5519ba03 100644
--- a/packages/backend/src/remote/activitypub/models/person.ts
+++ b/packages/backend/src/remote/activitypub/models/person.ts
@@ -135,7 +135,7 @@ export async function fetchPerson(
 ): Promise<CacheableUser | null> {
 	if (typeof uri !== "string") throw new Error("uri is not string");
 
-	const cached = await uriPersonCache.get(uri);
+	const cached = await uriPersonCache.get(uri, true);
 	if (cached) return cached;
 
 	// Fetch from the database if the URI points to this server
diff --git a/packages/backend/src/server/api/authenticate.ts b/packages/backend/src/server/api/authenticate.ts
index b6fa973eb..460a0ce84 100644
--- a/packages/backend/src/server/api/authenticate.ts
+++ b/packages/backend/src/server/api/authenticate.ts
@@ -9,7 +9,7 @@ import {
 	localUserByNativeTokenCache,
 } from "@/services/user-cache.js";
 
-const appCache = new Cache<App>("app", Infinity);
+const appCache = new Cache<App>("app", 60 * 30);
 
 export class AuthenticationError extends Error {
 	constructor(message: string) {
@@ -49,6 +49,7 @@ export default async (
 		const user = await localUserByNativeTokenCache.fetch(
 			token,
 			() => Users.findOneBy({ token }) as Promise<ILocalUser | null>,
+			true,
 		);
 
 		if (user == null) {
@@ -82,11 +83,14 @@ export default async (
 				Users.findOneBy({
 					id: accessToken.userId,
 				}) as Promise<ILocalUser>,
+			true,
 		);
 
 		if (accessToken.appId) {
-			const app = await appCache.fetch(accessToken.appId, () =>
-				Apps.findOneByOrFail({ id: accessToken.appId! }),
+			const app = await appCache.fetch(
+				accessToken.appId,
+				() => Apps.findOneByOrFail({ id: accessToken.appId! }),
+				true,
 			);
 
 			return [
diff --git a/packages/backend/src/server/nodeinfo.ts b/packages/backend/src/server/nodeinfo.ts
index 28cefd2cf..940ca2e13 100644
--- a/packages/backend/src/server/nodeinfo.ts
+++ b/packages/backend/src/server/nodeinfo.ts
@@ -100,7 +100,10 @@ const nodeinfo2 = async () => {
 	};
 };
 
-const cache = new Cache<Awaited<ReturnType<typeof nodeinfo2>>>("nodeinfo", 1000 * 60 * 10);
+const cache = new Cache<Awaited<ReturnType<typeof nodeinfo2>>>(
+	"nodeinfo",
+	60 * 10,
+);
 
 router.get(nodeinfo2_1path, async (ctx) => {
 	const base = await cache.fetch(null, () => nodeinfo2());
diff --git a/packages/backend/src/services/instance-actor.ts b/packages/backend/src/services/instance-actor.ts
index 1822cb3c7..a8b34ea57 100644
--- a/packages/backend/src/services/instance-actor.ts
+++ b/packages/backend/src/services/instance-actor.ts
@@ -6,10 +6,10 @@ import { IsNull } from "typeorm";
 
 const ACTOR_USERNAME = "instance.actor" as const;
 
-const cache = new Cache<ILocalUser>("instanceActor", Infinity);
+const cache = new Cache<ILocalUser>("instanceActor", 60 * 30);
 
 export async function getInstanceActor(): Promise<ILocalUser> {
-	const cached = await cache.get(null);
+	const cached = await cache.get(null, true);
 	if (cached) return cached;
 
 	const user = (await Users.findOneBy({
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index ca0f05f2c..095c75f42 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -29,17 +29,14 @@ import {
 	Notes,
 	Instances,
 	UserProfiles,
-	Antennas,
-	Followings,
 	MutedNotes,
 	Channels,
 	ChannelFollowings,
-	Blockings,
 	NoteThreadMutings,
 } from "@/models/index.js";
 import type { DriveFile } from "@/models/entities/drive-file.js";
 import type { App } from "@/models/entities/app.js";
-import { Not, In, IsNull } from "typeorm";
+import { Not, In } from "typeorm";
 import type { User, ILocalUser, IRemoteUser } from "@/models/entities/user.js";
 import { genId } from "@/misc/gen-id.js";
 import {
@@ -73,7 +70,7 @@ import { Mutex } from "redis-semaphore";
 
 const mutedWordsCache = new Cache<
 	{ userId: UserProfile["userId"]; mutedWords: UserProfile["mutedWords"] }[]
->("mutedWords", 1000 * 60 * 5);
+>("mutedWords", 60 * 5);
 
 type NotificationType = "reply" | "renote" | "quote" | "mention";
 
diff --git a/packages/backend/src/services/register-or-fetch-instance-doc.ts b/packages/backend/src/services/register-or-fetch-instance-doc.ts
index e0c288037..c0ead0819 100644
--- a/packages/backend/src/services/register-or-fetch-instance-doc.ts
+++ b/packages/backend/src/services/register-or-fetch-instance-doc.ts
@@ -4,7 +4,7 @@ import { genId } from "@/misc/gen-id.js";
 import { toPuny } from "@/misc/convert-host.js";
 import { Cache } from "@/misc/cache.js";
 
-const cache = new Cache<Instance>("registerOrFetchInstanceDoc", 1000 * 60 * 60);
+const cache = new Cache<Instance>("registerOrFetchInstanceDoc", 60 * 60);
 
 export async function registerOrFetchInstanceDoc(
 	host: string,
diff --git a/packages/backend/src/services/relay.ts b/packages/backend/src/services/relay.ts
index 1ec2891e8..6f7829c21 100644
--- a/packages/backend/src/services/relay.ts
+++ b/packages/backend/src/services/relay.ts
@@ -15,7 +15,7 @@ import { createSystemUser } from "./create-system-user.js";
 
 const ACTOR_USERNAME = "relay.actor" as const;
 
-const relaysCache = new Cache<Relay[]>("relay", 1000 * 60 * 10);
+const relaysCache = new Cache<Relay[]>("relay", 60 * 10);
 
 export async function getRelayActor(): Promise<ILocalUser> {
 	const user = await Users.findOneBy({
diff --git a/packages/backend/src/services/user-cache.ts b/packages/backend/src/services/user-cache.ts
index 7fde21d87..ed700185d 100644
--- a/packages/backend/src/services/user-cache.ts
+++ b/packages/backend/src/services/user-cache.ts
@@ -7,13 +7,19 @@ import { Users } from "@/models/index.js";
 import { Cache } from "@/misc/cache.js";
 import { redisClient, subscriber } from "@/db/redis.js";
 
-export const userByIdCache = new Cache<CacheableUser>("userById", Infinity);
+export const userByIdCache = new Cache<CacheableUser>("userById", 60 * 30);
 export const localUserByNativeTokenCache = new Cache<CacheableLocalUser | null>(
 	"localUserByNativeToken",
-	Infinity,
+	60 * 30,
+);
+export const localUserByIdCache = new Cache<CacheableLocalUser>(
+	"localUserByIdCache",
+	60 * 30,
+);
+export const uriPersonCache = new Cache<CacheableUser | null>(
+	"uriPerson",
+	60 * 30,
 );
-export const localUserByIdCache = new Cache<CacheableLocalUser>("localUserByIdCache", Infinity);
-export const uriPersonCache = new Cache<CacheableUser | null>("uriPerson", Infinity);
 
 subscriber.on("message", async (_, data) => {
 	const obj = JSON.parse(data);