diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a25f6fa6..b2b99ff72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 - UIの改善
 
 ### Bugfixes
+- アカウントデータのエクスポート/インポート処理ができない問題を修正
 - popupで設定ページを表示すると、アカウントの削除ページにアクセスすることができない問題を修正
 
 ## 12.90.1 (2021/09/05)
diff --git a/src/queue/processors/db/export-blocking.ts b/src/queue/processors/db/export-blocking.ts
index a0fc38500..8b8aa259d 100644
--- a/src/queue/processors/db/export-blocking.ts
+++ b/src/queue/processors/db/export-blocking.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import addFile from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Blockings } from '@/models/index';
 import { MoreThan } from 'typeorm';
diff --git a/src/queue/processors/db/export-following.ts b/src/queue/processors/db/export-following.ts
index 361215036..a0ecf5f56 100644
--- a/src/queue/processors/db/export-following.ts
+++ b/src/queue/processors/db/export-following.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import addFile from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Followings } from '@/models/index';
 import { MoreThan } from 'typeorm';
diff --git a/src/queue/processors/db/export-mute.ts b/src/queue/processors/db/export-mute.ts
index 70b2272cd..d5976f7d5 100644
--- a/src/queue/processors/db/export-mute.ts
+++ b/src/queue/processors/db/export-mute.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import addFile from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, Mutings } from '@/models/index';
 import { MoreThan } from 'typeorm';
diff --git a/src/queue/processors/db/export-notes.ts b/src/queue/processors/db/export-notes.ts
index 3f146aff1..49850aa70 100644
--- a/src/queue/processors/db/export-notes.ts
+++ b/src/queue/processors/db/export-notes.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import addFile from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { Users, Notes, Polls } from '@/models/index';
 import { MoreThan } from 'typeorm';
 import { Note } from '@/models/entities/note';
diff --git a/src/queue/processors/db/export-user-lists.ts b/src/queue/processors/db/export-user-lists.ts
index 89bbd5af1..8a86c4df5 100644
--- a/src/queue/processors/db/export-user-lists.ts
+++ b/src/queue/processors/db/export-user-lists.ts
@@ -4,7 +4,7 @@ import * as fs from 'fs';
 
 import { queueLogger } from '../../logger';
 import addFile from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { getFullApAccount } from '@/misc/convert-host';
 import { Users, UserLists, UserListJoinings } from '@/models/index';
 import { In } from 'typeorm';