diff --git a/frontend/src/pages/posts/PostDetailPage.tsx b/frontend/src/pages/posts/PostDetailPage.tsx
index 4c11c62..16697ba 100644
--- a/frontend/src/pages/posts/PostDetailPage.tsx
+++ b/frontend/src/pages/posts/PostDetailPage.tsx
@@ -14,7 +14,7 @@ import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
 import { fetchPost, toggleViewedFlg } from '@/lib/posts'
-import { postsKeys } from '@/lib/queryKeys'
+import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { cn } from '@/lib/utils'
 import NotFound from '@/pages/NotFound'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
@@ -140,6 +140,7 @@ export default (({ user }: Props) => {
 			      qc.setQueryData (postsKeys.show (postId),
 					       (prev: any) => newPost ?? prev)
 			      qc.invalidateQueries ({ queryKey: postsKeys.root })
+			      qc.invalidateQueries ({ queryKey: tagsKeys.root })
 			      toast ({ description: '更新しました．' })
 			    }}/>
 		      </Tab>)}