diff --git a/package-lock.json b/package-lock.json
index d9c667f71c..897efb9118 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@mdi/js": "^7.4.47",
         "@sapphi-red/web-noise-suppressor": "^0.3.5",
         "@shiguredo/virtual-background": "^2023.2.0",
-        "@traptitech/traq": "^3.17.0-3",
+        "@traptitech/traq": "^3.20.1-1",
         "@traptitech/traq-markdown-it": "^6.3.0",
         "autosize": "^6.0.1",
         "cropperjs": "^1.6.2",
@@ -4104,14 +4104,14 @@
       "integrity": "sha512-tH/Fk1WMsnSuLpuRsXw8iHtdivoCEI5V08hQ7doVm6WmzAnBf/cUzyH9+GbOldPq9Hwv9v9tuy5t/MxmdNAGXg=="
     },
     "node_modules/@traptitech/traq": {
-      "version": "3.17.0-3",
-      "resolved": "https://registry.npmjs.org/@traptitech/traq/-/traq-3.17.0-3.tgz",
-      "integrity": "sha512-PsZltFNiguEfRoAmtOJ7R3wuiLQLh0m6RXfpuFdIaUvP+Z43GI4M1fX7AOOBHXoUIRgHEhLxNNFAo3/IzL/ELQ==",
+      "version": "3.20.1-1",
+      "resolved": "https://registry.npmjs.org/@traptitech/traq/-/traq-3.20.1-1.tgz",
+      "integrity": "sha512-8NOIUWplHlOJQrQDaMxwKI0T6KjUYoFCBzu8SmmDSqr1DQMgReVmOYsekUHry7DnsvAmEha23zhIRAkOwj2Z+Q==",
       "dependencies": {
-        "axios": "^1.6.8"
+        "axios": "^1.7.7"
       },
       "engines": {
-        "node": "20.x"
+        "node": ">=20.0.0"
       }
     },
     "node_modules/@traptitech/traq-markdown-it": {
diff --git a/package.json b/package.json
index b78a4f0f8f..67334a6422 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "@mdi/js": "^7.4.47",
     "@sapphi-red/web-noise-suppressor": "^0.3.5",
     "@shiguredo/virtual-background": "^2023.2.0",
-    "@traptitech/traq": "^3.17.0-3",
+    "@traptitech/traq": "^3.20.1-1",
     "@traptitech/traq-markdown-it": "^6.3.0",
     "autosize": "^6.0.1",
     "cropperjs": "^1.6.2",
diff --git a/src/components/GroupManager/GroupMemberList.vue b/src/components/GroupManager/GroupMemberList.vue
index ff8c4b9351..51545d54bb 100644
--- a/src/components/GroupManager/GroupMemberList.vue
+++ b/src/components/GroupManager/GroupMemberList.vue
@@ -57,15 +57,8 @@ const onClickAdd = () => {
 const onClickDeleteAll = async () => {
   if (!confirm('本当に全メンバーを削除しますか？')) return
 
-  const ONCE = 10
   try {
-    for (let i = 0; i < Math.ceil(props.members.length / ONCE); i++) {
-      await Promise.all(
-        props.members
-          .slice(i * ONCE, (i + 1) * ONCE)
-          .map(m => apis.removeUserGroupMember(props.groupId, m.id))
-      )
-    }
+    apis.removeUserGroupMembers(props.groupId)
   } catch {
     addErrorToast('全メンバーの削除に失敗しました')
   }
diff --git a/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue b/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
index ce5bbd55ed..8109831582 100644
--- a/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
+++ b/src/components/Modal/GroupMemberAddModal/GroupMemberAddModal.vue
@@ -51,13 +51,12 @@ const role = ref('')
 const isAdding = ref(false)
 const add = async () => {
   isAdding.value = true
+  const reqIds = Array.from(userIds.value)
   try {
-    for (const userId of userIds.value) {
-      await apis.addUserGroupMember(props.id, {
-        id: userId,
-        role: role.value
-      })
-    }
+    await apis.addUserGroupMember(
+      props.id,
+      reqIds.map(id => ({ id, role: role.value }))
+    )
   } catch {
     addErrorToast('グループメンバーの追加に失敗しました')
   }
diff --git a/src/lib/apis.ts b/src/lib/apis.ts
index 601a7dc461..0c5467880b 100644
--- a/src/lib/apis.ts
+++ b/src/lib/apis.ts
@@ -1,5 +1,4 @@
 import type {
-  WebRTCUserStateSessionsInner,
   ChannelEvent,
   ChannelEventTypeEnum,
   ChildCreatedEvent,
@@ -8,6 +7,7 @@ import type {
   ParentChangedEvent,
   PinAddedEvent,
   PinRemovedEvent,
+  Session,
   SubscribersChangedEvent,
   TopicChangedEvent,
   VisibilityChangedEvent
@@ -18,7 +18,7 @@ import { DEV_SERVER } from '/@/lib/define'
 import type { AxiosError } from 'axios'
 import { constructFilesPath } from '/@/router'
 
-export type { WebRTCUserStateSessionsInner as WebRTCUserStateSessions }
+export type { Session as WebRTCUserStateSessions }
 
 export const BASE_PATH = '/api/v3'
 export const WEBSOCKET_ENDPOINT = '/api/v3/ws'