diff --git a/packages/backend/package.json b/packages/backend/package.json
index d756a134b..05641389f 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -87,7 +87,7 @@
 		"cli-highlight": "2.1.11",
 		"content-disposition": "0.5.4",
 		"crc-32": "1.2.1",
-		"dateformat": "5.0.2",
+		"dateformat": "4.5.1",
 		"deep-email-validator": "0.1.21",
 		"escape-regexp": "0.0.1",
 		"eslint": "8.8.0",
diff --git a/packages/backend/src/queue/processors/db/export-blocking.ts b/packages/backend/src/queue/processors/db/export-blocking.ts
index 7e23b0eb4..01edaaeb6 100644
--- a/packages/backend/src/queue/processors/db/export-blocking.ts
+++ b/packages/backend/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/packages/backend/src/queue/processors/db/export-custom-emojis.ts b/packages/backend/src/queue/processors/db/export-custom-emojis.ts
index f93231763..240a542fe 100644
--- a/packages/backend/src/queue/processors/db/export-custom-emojis.ts
+++ b/packages/backend/src/queue/processors/db/export-custom-emojis.ts
@@ -7,7 +7,7 @@ const mime = require('mime-types');
 const archiver = require('archiver');
 import { queueLogger } from '../../logger';
 import { addFile } from '@/services/drive/add-file';
-import dateFormat from 'dateformat';
+import * as dateFormat from 'dateformat';
 import { Users, Emojis } from '@/models/index';
 import {  } from '@/queue/types';
 import { downloadUrl } from '@/misc/download-url';
diff --git a/packages/backend/src/queue/processors/db/export-following.ts b/packages/backend/src/queue/processors/db/export-following.ts
index d5f58b11b..06572acec 100644
--- a/packages/backend/src/queue/processors/db/export-following.ts
+++ b/packages/backend/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, Mutings } from '@/models/index';
 import { In, MoreThan, Not } from 'typeorm';
diff --git a/packages/backend/src/queue/processors/db/export-mute.ts b/packages/backend/src/queue/processors/db/export-mute.ts
index b673f810a..4a856f8ef 100644
--- a/packages/backend/src/queue/processors/db/export-mute.ts
+++ b/packages/backend/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/packages/backend/src/queue/processors/db/export-notes.ts b/packages/backend/src/queue/processors/db/export-notes.ts
index 84d4c8bd8..305abf44c 100644
--- a/packages/backend/src/queue/processors/db/export-notes.ts
+++ b/packages/backend/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/packages/backend/src/queue/processors/db/export-user-lists.ts b/packages/backend/src/queue/processors/db/export-user-lists.ts
index 71d7377bd..f907cf952 100644
--- a/packages/backend/src/queue/processors/db/export-user-lists.ts
+++ b/packages/backend/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';
diff --git a/packages/backend/yarn.lock b/packages/backend/yarn.lock
index cffc4f8ad..202d70b5e 100644
--- a/packages/backend/yarn.lock
+++ b/packages/backend/yarn.lock
@@ -2099,10 +2099,10 @@ data-urls@^3.0.1:
     whatwg-mimetype "^3.0.0"
     whatwg-url "^10.0.0"
 
-dateformat@5.0.2:
-  version "5.0.2"
-  resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-5.0.2.tgz#0f275609b02e3306ff76d6a2067a6ebb98e6114b"
-  integrity sha512-h9vywpuz+ReixnJTwFx5JLtZpS8eLCbRm8shwwKkCKOZA547N6yoMtD3W91Z6+NFZ8wOaZlcaCcK/w+kELhSVg==
+dateformat@4.5.1:
+  version "4.5.1"
+  resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-4.5.1.tgz#c20e7a9ca77d147906b6dc2261a8be0a5bd2173c"
+  integrity sha512-OD0TZ+B7yP7ZgpJf5K2DIbj3FZvFvxgFUuaqA/V5zTjAtAAXZ1E8bktHxmAGs4x5b7PflqA9LeQ84Og7wYtF7Q==
 
 debug@2, debug@^2.2.0, debug@^2.5.2, debug@^2.6.9:
   version "2.6.9"