diff --git a/packages/backend/src/core/CreateSystemUserService.ts b/packages/backend/src/core/CreateSystemUserService.ts
index 3419d0b497ca..10400402d6f2 100644
--- a/packages/backend/src/core/CreateSystemUserService.ts
+++ b/packages/backend/src/core/CreateSystemUserService.ts
@@ -38,7 +38,7 @@ export class CreateSystemUserService {
 		// Generate secret
 		const secret = generateNativeUserToken();
 
-		const keyPair = await genRsaKeyPair();
+		const keyPair = await genRsaKeyPair(3072);
 
 		let account!: MiUser;
 
diff --git a/packages/backend/src/core/SignupService.ts b/packages/backend/src/core/SignupService.ts
index dfec0cfcfe15..aa37933003fc 100644
--- a/packages/backend/src/core/SignupService.ts
+++ b/packages/backend/src/core/SignupService.ts
@@ -93,7 +93,7 @@ export class SignupService {
 
 		const keyPair = await new Promise<string[]>((res, rej) =>
 			generateKeyPair('rsa', {
-				modulusLength: 2048,
+				modulusLength: 3072,
 				publicKeyEncoding: {
 					type: 'spki',
 					format: 'pem',