diff --git a/package.json b/package.json
index e67b33ceb7..3806074de2 100644
--- a/package.json
+++ b/package.json
@@ -95,7 +95,7 @@
 		"css-loader": "0.28.11",
 		"debug": "3.1.0",
 		"deep-equal": "1.0.1",
-		"deepcopy": "1.0.0",
+		"deepcopy": "0.6.3",
 		"diskusage": "0.2.4",
 		"dompurify": "1.0.4",
 		"elasticsearch": "15.0.0",
diff --git a/src/models/app.ts b/src/models/app.ts
index 45c95d92d8..7926f2fac2 100644
--- a/src/models/app.ts
+++ b/src/models/app.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import AccessToken from './access-token';
 import db from '../db/mongodb';
 import config from '../config';
diff --git a/src/models/auth-session.ts b/src/models/auth-session.ts
index 6fe3468a7b..219b1a4c8b 100644
--- a/src/models/auth-session.ts
+++ b/src/models/auth-session.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import { pack as packApp } from './app';
 
diff --git a/src/models/drive-file.ts b/src/models/drive-file.ts
index a3a567038e..bb98c11a93 100644
--- a/src/models/drive-file.ts
+++ b/src/models/drive-file.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import { pack as packFolder } from './drive-folder';
 import config from '../config';
 import monkDb, { nativeDbConn } from '../db/mongodb';
diff --git a/src/models/drive-folder.ts b/src/models/drive-folder.ts
index e7961936aa..cafb9cdf13 100644
--- a/src/models/drive-folder.ts
+++ b/src/models/drive-folder.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import DriveFile from './drive-file';
 
diff --git a/src/models/favorite.ts b/src/models/favorite.ts
index d24833f191..45417212e3 100644
--- a/src/models/favorite.ts
+++ b/src/models/favorite.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import { pack as packNote } from './note';
 
diff --git a/src/models/messaging-message.ts b/src/models/messaging-message.ts
index a6a50fc8cf..ad2d1657e6 100644
--- a/src/models/messaging-message.ts
+++ b/src/models/messaging-message.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import { pack as packUser } from './user';
 import { pack as packFile } from './drive-file';
 import db from '../db/mongodb';
diff --git a/src/models/note-reaction.ts b/src/models/note-reaction.ts
index 706ae54c16..e5e108c017 100644
--- a/src/models/note-reaction.ts
+++ b/src/models/note-reaction.ts
@@ -1,6 +1,6 @@
 import * as mongo from 'mongodb';
 import $ from 'cafy';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import Reaction from './note-reaction';
 import { pack as packUser } from './user';
diff --git a/src/models/note.ts b/src/models/note.ts
index 1274901d45..5d7bab3833 100644
--- a/src/models/note.ts
+++ b/src/models/note.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import rap from '@prezzemolo/rap';
 import db from '../db/mongodb';
 import { IUser, pack as packUser } from './user';
diff --git a/src/models/notification.ts b/src/models/notification.ts
index 76871166a9..c4cf1e4efd 100644
--- a/src/models/notification.ts
+++ b/src/models/notification.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import { IUser, pack as packUser } from './user';
 import { pack as packNote } from './note';
diff --git a/src/models/othello-game.ts b/src/models/othello-game.ts
index 297aee3028..1dd375d2e5 100644
--- a/src/models/othello-game.ts
+++ b/src/models/othello-game.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import { IUser, pack as packUser } from './user';
 
diff --git a/src/models/othello-matching.ts b/src/models/othello-matching.ts
index 8082c258c8..0efba3ae5d 100644
--- a/src/models/othello-matching.ts
+++ b/src/models/othello-matching.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 import { IUser, pack as packUser } from './user';
 
diff --git a/src/models/signin.ts b/src/models/signin.ts
index 7f56e1a283..d8b05c0e30 100644
--- a/src/models/signin.ts
+++ b/src/models/signin.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from '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 7100fced7e..4cf1de61a4 100644
--- a/src/models/user-list.ts
+++ b/src/models/user-list.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import db from '../db/mongodb';
 
 const UserList = db.get<IUserList>('userList');
diff --git a/src/models/user.ts b/src/models/user.ts
index ff1ae57d73..74ddcc77f9 100644
--- a/src/models/user.ts
+++ b/src/models/user.ts
@@ -1,5 +1,5 @@
 import * as mongo from 'mongodb';
-import deepcopy = require('deepcopy');
+import * as deepcopy from 'deepcopy';
 import sequential = require('promise-sequential');
 import rap from '@prezzemolo/rap';
 import db from '../db/mongodb';