diff --git a/packages/backend/package.json b/packages/backend/package.json
index 7bae448609..8ad3b0e3ba 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -87,7 +87,6 @@
 		"koa-send": "5.0.1",
 		"koa-slow": "2.1.0",
 		"koa-views": "7.0.2",
-		"langdetect": "0.2.1",
 		"megalodon": "workspace:*",
 		"meilisearch": "0.34.1",
 		"mfm-js": "0.23.3",
diff --git a/packages/backend/src/models/repositories/note.ts b/packages/backend/src/models/repositories/note.ts
index b553c71c06..082455f42a 100644
--- a/packages/backend/src/models/repositories/note.ts
+++ b/packages/backend/src/models/repositories/note.ts
@@ -28,7 +28,6 @@ import {
 import { db } from "@/db/postgre.js";
 import { IdentifiableError } from "@/misc/identifiable-error.js";
 import { detect as detectLanguage_ } from "tinyld";
-import { detect } from "langdetect";
 
 export async function populatePoll(note: Note, meId: User["id"] | null) {
 	const poll = await Polls.findOneByOrFail({ noteId: note.id });
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 51ece395e9..9f1749dc34 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -279,9 +279,6 @@ importers:
       koa-views:
         specifier: 7.0.2
         version: 7.0.2(@types/koa@2.13.8)(ejs@3.1.9)(pug@3.0.2)
-      langdetect:
-        specifier: 0.2.1
-        version: 0.2.1
       megalodon:
         specifier: workspace:*
         version: link:../megalodon
@@ -12971,12 +12968,6 @@ packages:
     engines: {node: '>=14.16'}
     dev: false
 
-  /langdetect@0.2.1:
-    resolution: {integrity: sha512-vWK2xz8Urp6J0RFwnrR8+d0DQ2yIGjCOqAxBoXNMVFv4ZDmFsbCcNEtwuVnaQ5+ltwZ4Z5rTtuTwHSaEWFdw+A==}
-    dependencies:
-      unicode-9.0.0: 0.7.0
-    dev: false
-
   /last-run@1.1.1:
     resolution: {integrity: sha512-U/VxvpX4N/rFvPzr3qG5EtLKEnNI0emvIQB3/ecEwv+8GHaUKbIB8vxv1Oai5FAF0d0r7LXHhLLe5K/yChm5GQ==}
     engines: {node: '>= 0.10'}
@@ -18043,11 +18034,6 @@ packages:
       busboy: 1.6.0
     dev: false
 
-  /unicode-9.0.0@0.7.0:
-    resolution: {integrity: sha512-aqL0GQ3LB2nC3ZEKBZ93hfn7QY80sVGk+OT9Sc6lTxl4wRiwzUBRlAjJB9Fe4+5XydXOV+tb8udp5oRBoED5Tw==}
-    deprecated: Use @unicode/unicode-9.0.0 instead.
-    dev: false
-
   /unicode-emoji-json@0.4.0:
     resolution: {integrity: sha512-lVNOwh2AnmbwqtSrEVjAWKQoVzWgyWmXVqPuPkPfKb0tnA0+uYN/4ILCTdy9IRj/+3drAVhmjwjNJQr2dhCwnA==}
     dev: true