diff --git a/package.json b/package.json
index e5eb6b81fc5ed8acac0510e881314d5bcb73802e..23bcced515f2c48dd2fca8dc810849a059dab744 100644
--- a/package.json
+++ b/package.json
@@ -114,7 +114,6 @@
 		"cssnano": "4.1.10",
 		"dateformat": "3.0.3",
 		"deep-equal": "1.0.1",
-		"deepcopy": "0.6.3",
 		"diskusage": "1.0.0",
 		"double-ended-queue": "2.1.0-0",
 		"elasticsearch": "15.4.1",
diff --git a/src/@types/deepcopy.d.ts b/src/@types/deepcopy.d.ts
deleted file mode 100644
index 3eb08d57727ece0c8c35c059084da51c11ecb0ff..0000000000000000000000000000000000000000
--- a/src/@types/deepcopy.d.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-declare module 'deepcopy';
-
-declare namespace deepcopy {
-	type DeepcopyCustomizerValueType = 'Object';
-
-	type DeepcopyCustomizer<T> = (
-		value: T,
-		valueType: DeepcopyCustomizerValueType) => T;
-
-	interface DeepcopyOptions<T> {
-		customizer: DeepcopyCustomizer<T>;
-	}
-
-	export function deepcopy<T>(
-		value: T,
-		options?: DeepcopyOptions<T> | DeepcopyCustomizer<T>): T;
-}
diff --git a/src/misc/deepcopy.ts b/src/misc/deepcopy.ts
new file mode 100644
index 0000000000000000000000000000000000000000..b3bf09ddb205e325d458715859b2dfb0fd079c7b
--- /dev/null
+++ b/src/misc/deepcopy.ts
@@ -0,0 +1,3 @@
+export function deepcopy(x: any) {
+	return JSON.parse(JSON.stringify(x));
+}
diff --git a/src/models/abuse-user-report.ts b/src/models/abuse-user-report.ts
index f3900d348dc1d647d6af190a0af8d1255e9d38f1..5a1530deb3b2c2593e1729b4e7d9c20bdebcd735 100644
--- a/src/models/abuse-user-report.ts
+++ b/src/models/abuse-user-report.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import { pack as packUser } from './user';
diff --git a/src/models/app.ts b/src/models/app.ts
index 45d50bccda87b444b14830172b6eff537eff1f11..f46995ea2f8935958d92a21254d9b672bfcd3e77 100644
--- a/src/models/app.ts
+++ b/src/models/app.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import AccessToken from './access-token';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
diff --git a/src/models/auth-session.ts b/src/models/auth-session.ts
index 428c707470d1bd812024ca9828d110a9f293ca7d..66454d732e06b6a587889699a7bc8b728e70ddce 100644
--- a/src/models/auth-session.ts
+++ b/src/models/auth-session.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import { pack as packApp } from './app';
diff --git a/src/models/blocking.ts b/src/models/blocking.ts
index 4bdaa741e95828e872a0097ba4bf2f90f0e0e06b..a8025c0ca7daa56282897d1d80c93795a058dc16 100644
--- a/src/models/blocking.ts
+++ b/src/models/blocking.ts
@@ -1,7 +1,7 @@
 import * as mongo from 'mongodb';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import { pack as packUser, IUser } from './user';
 
 const Blocking = db.get<IBlocking>('blocking');
diff --git a/src/models/drive-file.ts b/src/models/drive-file.ts
index c31e9a709f2ceed94f042d71a42474d03982f877..626ab4ce4f2ccc1767c70aa397eb34000070f3e6 100644
--- a/src/models/drive-file.ts
+++ b/src/models/drive-file.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import { pack as packFolder } from './drive-folder';
 import { pack as packUser } from './user';
 import monkDb, { nativeDbConn } from '../db/mongodb';
diff --git a/src/models/drive-folder.ts b/src/models/drive-folder.ts
index b0f6e4273e2c6372a03bfb9b7460fece32366439..f9d599950ac3617f07f5d7f5572ac1b0862751a1 100644
--- a/src/models/drive-folder.ts
+++ b/src/models/drive-folder.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import DriveFile from './drive-file';
diff --git a/src/models/favorite.ts b/src/models/favorite.ts
index 2008edbfaf47625ccd38200fdd1ed272d07e8cd1..a7504088fb20cb8e1b3728c032d8277ed697231f 100644
--- a/src/models/favorite.ts
+++ b/src/models/favorite.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import { pack as packNote } from './note';
diff --git a/src/models/follow-request.ts b/src/models/follow-request.ts
index 4f75c63a32285da131504c57b665441df5218680..8f7c2b0f609929ad931c9920341cdcbf13b27ed4 100644
--- a/src/models/follow-request.ts
+++ b/src/models/follow-request.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import { pack as packUser } from './user';
diff --git a/src/models/games/reversi/game.ts b/src/models/games/reversi/game.ts
index 57c493cff50687b9307f2b9a2faaf979dfa95955..22710424de8c881f0a129ff6fbb85e05974ca9ae 100644
--- a/src/models/games/reversi/game.ts
+++ b/src/models/games/reversi/game.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../../../misc/deepcopy';
 import db from '../../../db/mongodb';
 import isObjectId from '../../../misc/is-objectid';
 import { IUser, pack as packUser } from '../../user';
diff --git a/src/models/games/reversi/matching.ts b/src/models/games/reversi/matching.ts
index ba2ac1bc051e55bd359a9f2c484cf700b1836894..29a6f9a9abbf297611b8836c32a4b9e6ad82ab1d 100644
--- a/src/models/games/reversi/matching.ts
+++ b/src/models/games/reversi/matching.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../../../misc/deepcopy';
 import db from '../../../db/mongodb';
 import isObjectId from '../../../misc/is-objectid';
 import { IUser, pack as packUser } from '../../user';
diff --git a/src/models/messaging-message.ts b/src/models/messaging-message.ts
index 67abb4d111f0ef7cfc00ab57e358dddaae37fe2e..e5ffba68b389b2e18297e32f2e2d6a2b0e4cfebf 100644
--- a/src/models/messaging-message.ts
+++ b/src/models/messaging-message.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import { pack as packUser } from './user';
 import { pack as packFile } from './drive-file';
 import db from '../db/mongodb';
diff --git a/src/models/mute.ts b/src/models/mute.ts
index 52775e13ca5fd5147861dcf352c8c8548c3fed06..317beaf0b8536595e0590e7279d3a869844f1617 100644
--- a/src/models/mute.ts
+++ b/src/models/mute.ts
@@ -1,7 +1,7 @@
 import * as mongo from 'mongodb';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import { pack as packUser, IUser } from './user';
 
 const Mute = db.get<IMute>('mute');
diff --git a/src/models/note-reaction.ts b/src/models/note-reaction.ts
index 4e449b400c506dfb7d20def9b8460e38cb864009..aaa0c48664fea2f09d5954f63d2b260359995e44 100644
--- a/src/models/note-reaction.ts
+++ b/src/models/note-reaction.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import Reaction from './note-reaction';
diff --git a/src/models/note.ts b/src/models/note.ts
index af45ff966de181cbfa2851c152b090de0d5db366..4eab0dd6b4aef9971aaacecb0b87bb28935f2f37 100644
--- a/src/models/note.ts
+++ b/src/models/note.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import rap from '@prezzemolo/rap';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
diff --git a/src/models/notification.ts b/src/models/notification.ts
index 75456af57b34036abad50d771a1e1216a8b81dcf..fc2b829cd3cbabd97f2f9f49b45f0439279e3f3b 100644
--- a/src/models/notification.ts
+++ b/src/models/notification.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 import { IUser, pack as packUser } from './user';
diff --git a/src/models/signin.ts b/src/models/signin.ts
index d8b05c0e3060dcc91ea16616c15e9dfb67a1f331..2739f214db35e4a76a10f45a32638a92d22805f8 100644
--- a/src/models/signin.ts
+++ b/src/models/signin.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 
 const Signin = db.get<ISignin>('signin');
diff --git a/src/models/user-list.ts b/src/models/user-list.ts
index e7dd74bdd176cfab1ce15e7c544384e2c3cb0331..b67a6e130b38c0744633ab8964f632c1b2c8a91b 100644
--- a/src/models/user-list.ts
+++ b/src/models/user-list.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
 
diff --git a/src/models/user.ts b/src/models/user.ts
index 0c3f7b5508792e4282f3dffb6955875c2fb68f6c..f09cf294a4b34489779ffe2a732913164058b87c 100644
--- a/src/models/user.ts
+++ b/src/models/user.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../misc/deepcopy';
 import rap from '@prezzemolo/rap';
 import db from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
diff --git a/src/services/note/create.ts b/src/services/note/create.ts
index 5f69329a4e4043cbd7148ff5c5a1b0695e35a68a..933f5671ad8dba0fd97b9ed8b6e13585fd3d4232 100644
--- a/src/services/note/create.ts
+++ b/src/services/note/create.ts
@@ -25,7 +25,7 @@ import notesChart from '../../services/chart/notes';
 import perUserNotesChart from '../../services/chart/per-user-notes';
 import activeUsersChart from '../../services/chart/active-users';
 import instanceChart from '../../services/chart/instance';
-import * as deepcopy from 'deepcopy';
+import { deepcopy } from '../../misc/deepcopy';
 
 import { erase, concat } from '../../prelude/array';
 import insertNoteUnread from './unread';