diff --git a/backend/src/federation/client/Client_1_1.ts b/backend/src/federation/client/Client_1_1.ts
index 7ef17694e..9a67757f4 100644
--- a/backend/src/federation/client/Client_1_1.ts
+++ b/backend/src/federation/client/Client_1_1.ts
@@ -1,5 +1,3 @@
-import { FederatedCommunity as DbFederatedCommunity } from '@entity/FederatedCommunity'
-
 import { getPublicCommunityInfo } from '@/federation/query/getPublicCommunityInfo'
 import { backendLogger as logger } from '@/server/logger'
 
@@ -13,12 +11,7 @@ export interface PublicCommunityInfo {
   publicKey: string
 }
 
-// eslint-disable-next-line camelcase
 export class Client_1_1 extends Client_1_0 {
-  constructor(dbCom: DbFederatedCommunity) {
-    super(dbCom)
-  }
-
   getPublicCommunityInfo = async (): Promise<PublicCommunityInfo | undefined> => {
     logger.info(`getPublicCommunityInfo with endpoint='${this.endpoint}'...`)
     try {
diff --git a/backend/src/federation/validateCommunities.ts b/backend/src/federation/validateCommunities.ts
index f00f4b4b3..adca47f77 100644
--- a/backend/src/federation/validateCommunities.ts
+++ b/backend/src/federation/validateCommunities.ts
@@ -7,7 +7,7 @@ import { FederatedCommunity as DbFederatedCommunity } from '@entity/FederatedCom
 import { backendLogger as logger } from '@/server/logger'
 
 import { Client } from './client/Client'
-import { PublicCommunityInfo } from './client/Client_1_1'
+import { PublicCommunityInfo, Client_1_1 } from './client/Client_1_1'
 import { ApiVersionType } from './enum/apiVersionType'
 
 export function startValidateCommunities(timerInterval: number): void {
@@ -44,10 +44,12 @@ export async function validateCommunities(): Promise<void> {
       if (pubKey && pubKey === dbCom.publicKey.toString()) {
         await DbFederatedCommunity.update({ id: dbCom.id }, { verifiedAt: new Date() })
         logger.info('Federation: verified community', dbCom)
-        const pubComInfo = await client?.getPublicCommunityInfo()
-        if (pubComInfo) {
-          await writeForeignCommunity(dbCom, pubComInfo)
-          logger.info(`Federation: write foreign community... successfully`)
+        if (client instanceof Client_1_1) {
+          const pubComInfo = await client.getPublicCommunityInfo()
+          if (pubComInfo) {
+            await writeForeignCommunity(dbCom, pubComInfo)
+            logger.info(`Federation: write foreign community... successfully`)
+          }
         }
       } else {
         logger.warn(
diff --git a/federation/src/graphql/api/1_0/model/GetPublicCommunityInfoResult.ts b/federation/src/graphql/api/1_0/model/GetPublicCommunityInfoResult.ts
index ea225203a..91ed5e2ff 100644
--- a/federation/src/graphql/api/1_0/model/GetPublicCommunityInfoResult.ts
+++ b/federation/src/graphql/api/1_0/model/GetPublicCommunityInfoResult.ts
@@ -1,6 +1,6 @@
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { Community as DbCommunity } from '@entity/Community'
-/* @typescript-eslint/no-unused-vars */
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 import { Field, ObjectType } from 'type-graphql'
 
 @ObjectType()
diff --git a/federation/tsconfig.json b/federation/tsconfig.json
index b38c43ba1..2326786ac 100644
--- a/federation/tsconfig.json
+++ b/federation/tsconfig.json
@@ -4,7 +4,7 @@
 
     /* Basic Options */
     // "incremental": true,                         /* Enable incremental compilation */
-    "target": "es6",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */
+    "target": "esNext",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */
     "module": "commonjs",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
     // "lib": [],                                   /* Specify library files to be included in the compilation. */
     // "allowJs": true,                             /* Allow javascript files to be compiled. */