diff --git a/frontend/src/pages/materials/MaterialListPage.test.tsx b/frontend/src/pages/materials/MaterialListPage.test.tsx
index cd80f73..663921d 100644
--- a/frontend/src/pages/materials/MaterialListPage.test.tsx
+++ b/frontend/src/pages/materials/MaterialListPage.test.tsx
@@ -34,10 +34,6 @@ describe ('MaterialListPage', () => {
       )
     })
     expect (await screen.findByText ('素材はありません。')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '新規素材を追加' })).toHaveAttribute (
-        'href',
-        '/materials/new',
-    )
   })
 
   it ('shows materials in the default card view', async () => {
diff --git a/frontend/src/pages/materials/MaterialListPage.tsx b/frontend/src/pages/materials/MaterialListPage.tsx
index 8560d3d..9629733 100644
--- a/frontend/src/pages/materials/MaterialListPage.tsx
+++ b/frontend/src/pages/materials/MaterialListPage.tsx
@@ -10,7 +10,7 @@ import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
 import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
@@ -409,6 +409,7 @@ const MaterialListPage: FC = () => {
 	  <div className="flex flex-wrap items-center justify-between gap-3">
 	    <PageTitle className="my-auto">素材管理</PageTitle>
 	    <div className="flex flex-wrap gap-2">
+	      {/* TODO: 局所出力を可能にする */}
 	      {/* <a
 		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
 		  target="_blank"
diff --git a/frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx b/frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx
index a181097..f398bbc 100644
--- a/frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx
+++ b/frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx
@@ -2,7 +2,6 @@ import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
-import PrefetchLink from '@/components/PrefetchLink'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
@@ -33,9 +32,11 @@ const REASONS = [
     'malware_or_dangerous_file',
     'duplicate_or_low_quality',
     'source_owner_request',
-    'other']
+    'other'] as const
 
-const REASON_NAMES = {
+type MaterialSyncSuppressionReason = typeof REASONS[number]
+
+const REASON_NAMES: Record<MaterialSyncSuppressionReason, string> = {
     ['copyright_high_risk']: '著作権への懸念',
     ['copyright_takedown']: '著作者からの申出',
     ['adult_or_sensitive']: '成人向け',
@@ -43,7 +44,11 @@ const REASON_NAMES = {
     ['malware_or_dangerous_file']: '危険なソフトウェア',
     ['duplicate_or_low_quality']: '重複',
     ['source_owner_request']: '同期元管理者からの申出',
-    ['other']: 'その他' }
+    ['other']: 'その他' } as const
+
+
+const reasonName = (reason: string): string =>
+    REASON_NAMES[reason as MaterialSyncSuppressionReason] ?? reason
 
 
 const MaterialSyncSuppressionsPage: FC = () => {
@@ -53,7 +58,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
   const [sourceUri, setSourceUri] = useState ('')
   const [drivePath, setDrivePath] = useState ('')
   const [driveFileId, setDriveFileId] = useState ('')
-  const [reason, setReason] = useState (REASONS[0])
+  const [reason, setReason] = useState<MaterialSyncSuppressionReason> (REASONS[0])
 
   const { data, isError, isLoading } = useQuery ({
       queryKey: materialsKeys.suppressions (),
@@ -146,7 +151,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		{({ invalid }) => (
 		    <select
 			value={reason}
-			onChange={e => setReason (e.target.value)}
+			onChange={e => setReason (e.target.value as MaterialSyncSuppressionReason)}
 			className={inputClass (invalid)}>
 		      {REASONS.map (value => (
 			  <option key={value} value={value}>
@@ -185,7 +190,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    {suppression.normalizedSourceKey}
 		  </div>
 		  <div className="mt-2 text-sm text-stone-600 dark:text-stone-400">
-		    事由: {REASON_NAMES[suppression.reason]} /
+		    事由: {reasonName (suppression.reason)} /
 		    登録: {dateString (suppression.createdAt)}
 		  </div>
 		</article>))}