diff --git a/packages/backend/src/@types/redis-lock.d.ts b/packages/backend/src/@types/redis-lock.d.ts
index b037cde5ee..e27b943956 100644
--- a/packages/backend/src/@types/redis-lock.d.ts
+++ b/packages/backend/src/@types/redis-lock.d.ts
@@ -4,9 +4,14 @@
  */
 
 declare module 'redis-lock' {
-	import type Redis from 'ioredis';
+	export interface NodeRedis {
+		readonly v4: true;
+		set(key: string, value: string | number, opts?: { PX?: number, NX?: boolean }): Promise<'OK' | null>;
+		del(key: string): Promise<number>;
+	}
 
-	type Lock = (lockName: string, timeout?: number, taskToPerform?: () => Promise<void>) => void;
+	export type Unlock = () => Promise<void>;
+	export type Lock = (lockName: string, timeout?: number) => Promise<Unlock>;
 	function redisLock(client: Redis.Redis, retryDelay: number): Lock;
 
 	export = redisLock;
diff --git a/packages/backend/src/core/AppLockService.ts b/packages/backend/src/core/AppLockService.ts
index bd2749cb87..9d31247e25 100644
--- a/packages/backend/src/core/AppLockService.ts
+++ b/packages/backend/src/core/AppLockService.ts
@@ -5,7 +5,7 @@
 
 import { promisify } from 'node:util';
 import { Inject, Injectable } from '@nestjs/common';
-import redisLock from 'redis-lock';
+import redisLock, { Unlock, NodeRedis } from 'redis-lock';
 import * as Redis from 'ioredis';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
@@ -17,13 +17,13 @@ const retryDelay = 100;
 
 @Injectable()
 export class AppLockService {
-	private lock: (key: string, timeout?: number, _?: (() => Promise<void>) | undefined) => Promise<() => void>;
+	private lock: (key: string, timeout?: number) => Promise<Unlock>;
 
 	constructor(
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis,
 	) {
-		this.lock = promisify(redisLock(this.redisClient, retryDelay));
+		this.lock = redisLock(adaptRedis(this.redisClient), retryDelay);
 	}
 
 	/**
@@ -33,12 +33,36 @@ export class AppLockService {
 	 * @returns Unlock function
 	 */
 	@bindThis
-	public getApLock(uri: string, timeout = 30 * 1000): Promise<() => void> {
+	public getApLock(uri: string, timeout = 30 * 1000): Promise<Unlock> {
 		return this.lock(`ap-object:${uri}`, timeout);
 	}
 
 	@bindThis
-	public getChartInsertLock(lockKey: string, timeout = 30 * 1000): Promise<() => void> {
+	public getChartInsertLock(lockKey: string, timeout = 30 * 1000): Promise<Unlock> {
 		return this.lock(`chart-insert:${lockKey}`, timeout);
 	}
 }
+
+/**
+ * Adapts an ioredis instance into something close enough to NodeRedis that it works with redis-lock.
+ */
+function adaptRedis(ioredis: Redis.Redis): NodeRedis {
+	return {
+		v4: true,
+		async set(key: string, value: string | number, opts?: { PX?: number, NX?: boolean }) {
+			if (opts) {
+				if (opts.PX != null && opts.NX) {
+					return ioredis.set(key, value, 'PX', opts.PX, 'NX');
+				} else if (opts.PX != null) {
+					return ioredis.set(key, value, 'PX', opts.PX);
+				} else if (opts.NX) {
+					return ioredis.set(key, value, 'NX');
+				}
+			}
+			return ioredis.set(key, value);
+		},
+		async del(key: string) {
+			return await ioredis.del(key);
+		},
+	};
+}
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index 6c6d576114..97fbab9e69 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -399,7 +399,7 @@ export class ApInboxService {
 				uri,
 			});
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}
 
@@ -549,7 +549,7 @@ export class ApInboxService {
 			await this.apNoteService.createNote(note, actor, resolver, silent);
 			return 'ok';
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}
 
@@ -634,7 +634,7 @@ export class ApInboxService {
 			await this.noteDeleteService.delete(actor, note);
 			return 'ok: note deleted';
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}
 
diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index 6afe15b1f3..def6058c4e 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -562,7 +562,7 @@ export class ApNoteService implements OnModuleInit {
 			const createFrom = haveSameAuthority ? value : uri;
 			return await this.createNote(createFrom, undefined, options.resolver, true);
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}
 
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index a991516577..69d808b9f1 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -829,7 +829,7 @@ export class ApPersonService implements OnModuleInit {
 			const createFrom = haveSameAuthority ? value : uri;
 			return await this._createPerson(createFrom, resolver);
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}
 
diff --git a/packages/backend/src/core/chart/core.ts b/packages/backend/src/core/chart/core.ts
index 07c19deca5..2f1ed27132 100644
--- a/packages/backend/src/core/chart/core.ts
+++ b/packages/backend/src/core/chart/core.ts
@@ -16,6 +16,7 @@ import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 import { MiRepository, miRepository } from '@/models/_.js';
 import type { DataSource, Repository } from 'typeorm';
+import type { Lock } from 'redis-lock';
 
 const COLUMN_PREFIX = '___' as const;
 const UNIQUE_TEMP_COLUMN_PREFIX = 'unique_temp___' as const;
@@ -258,11 +259,11 @@ export default abstract class Chart<T extends Schema> {
 		};
 	}
 
-	private lock: (key: string) => Promise<() => void>;
+	private lock: Lock;
 
 	constructor(
 		db: DataSource,
-		lock: (key: string) => Promise<() => void>,
+		lock: Lock,
 		logger: Logger,
 		name: string,
 		schema: T,
@@ -400,7 +401,7 @@ export default abstract class Chart<T extends Schema> {
 
 			return log;
 		} finally {
-			unlock();
+			await unlock();
 		}
 	}