diff --git a/packages/backend/src/server/api/index.ts b/packages/backend/src/server/api/index.ts
index 40ecd10ecd..593c7a284c 100644
--- a/packages/backend/src/server/api/index.ts
+++ b/packages/backend/src/server/api/index.ts
@@ -12,7 +12,6 @@ import { Instances, AccessTokens, Users } from "@/models/index.js";
 import config from "@/config/index.js";
 import endpoints from "./endpoints.js";
 import compatibility from "./compatibility.js";
-import {koaBody} from "koa-body";
 import handler from "./api-handler.js";
 import signup from "./private/signup.js";
 import signin from "./private/signin.js";
@@ -24,6 +23,15 @@ import twitter from "./service/twitter.js";
 // Init app
 const app = new Koa();
 
+// Init multer instance
+const upload = multer({
+	storage: multer.diskStorage({}),
+	limits: {
+		fileSize: config.maxFileSize || 262144000,
+		files: 1,
+	},
+});
+
 app.use(
 	cors({
 		origin: "*",
@@ -36,13 +44,6 @@ app.use(async (ctx, next) => {
 	await next();
 });
 
-app.use(
-	koaBody({
-		json: false,
-		multipart: true
-	})
-);
-
 app.use(
 	bodyParser({
 		// リクエストが multipart/form-data でない限りはJSONだと見なす
@@ -54,14 +55,9 @@ app.use(
 	}),
 );
 
-// Init multer instance
-const upload = multer({
-	storage: multer.diskStorage({}),
-	limits: {
-		fileSize: config.maxFileSize || 262144000,
-		files: 1,
-	},
-});
+app.use(
+	upload.any()
+);
 
 // Init router
 const router = new Router();
@@ -75,7 +71,6 @@ for (const endpoint of [...endpoints, ...compatibility]) {
 	if (endpoint.meta.requireFile) {
 		router.post(
 			`/${endpoint.name}`,
-			upload.single("file"),
 			handler.bind(null, endpoint),
 		);
 	} else {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 476fd2fbbb..54880d9c92 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3335,7 +3335,7 @@ packages:
   /axios/0.24.0:
     resolution: {integrity: sha512-Q6cWsys88HoPgAaFAVUb0WpPk0O8iTeisR9IMqy9G8AbO4NlpVknrnQS03zzF9PGAWgO3cgletO3VjV/P7VztA==}
     dependencies:
-      follow-redirects: 1.15.2
+      follow-redirects: 1.15.2_debug@4.3.4
     transitivePeerDependencies:
       - debug
     dev: false
@@ -3343,7 +3343,7 @@ packages:
   /axios/0.25.0_debug@4.3.4:
     resolution: {integrity: sha512-cD8FOb0tRH3uuEe6+evtAbgJtfxr7ly3fQjYcMcuPlgkwVS9xboaVIpcDV+cYQe+yGykgwZCs1pzjntcGa6l5g==}
     dependencies:
-      follow-redirects: 1.15.2
+      follow-redirects: 1.15.2_debug@4.3.4
     transitivePeerDependencies:
       - debug
     dev: true
@@ -3351,7 +3351,7 @@ packages:
   /axios/1.2.2:
     resolution: {integrity: sha512-bz/J4gS2S3I7mpN/YZfGFTqhXTYzRho8Ay38w2otuuDR322KzFIWm/4W2K6gIwvWaws5n+mnb7D1lN9uD+QH6Q==}
     dependencies:
-      follow-redirects: 1.15.2
+      follow-redirects: 1.15.2_debug@4.3.4
       form-data: 4.0.0
       proxy-from-env: 1.1.0
     transitivePeerDependencies:
@@ -3361,7 +3361,7 @@ packages:
   /axios/1.3.2:
     resolution: {integrity: sha512-1M3O703bYqYuPhbHeya5bnhpYVsDDRyQSabNja04mZtboLNSuZ4YrltestrLXfHgmzua4TpUqRiVKbiQuo2epw==}
     dependencies:
-      follow-redirects: 1.15.2
+      follow-redirects: 1.15.2_debug@4.3.4
       form-data: 4.0.0
       proxy-from-env: 1.1.0
     transitivePeerDependencies:
@@ -6301,7 +6301,7 @@ packages:
       readable-stream: 2.3.7
     dev: true
 
-  /follow-redirects/1.15.2:
+  /follow-redirects/1.15.2_debug@4.3.4:
     resolution: {integrity: sha512-VQLG33o04KaQ8uYi2tVNbdrWp1QWxNNea+nmIB4EVM28v0hmP17z7aG1+wAkNzVq4KeXTq3221ye5qTJP91JwA==}
     engines: {node: '>=4.0'}
     peerDependencies:
@@ -6309,6 +6309,8 @@ packages:
     peerDependenciesMeta:
       debug:
         optional: true
+    dependencies:
+      debug: 4.3.4
 
   /for-each/0.3.3:
     resolution: {integrity: sha512-jqYfLp7mo9vIyQf8ykW2v7A+2N4QjeCeI5+Dz9XraiO1ign81wjiH7Fb9vSOWvQfNtmSa4H2RoQTrrXivdUZmw==}