diff --git a/bun.lockb b/bun.lockb
index de9546f..219c54a 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index 3fe6fc6..6edec34 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,6 @@
   "devDependencies": {
     "@types/bun": "1.1.6",
     "@woohm402/eslint-config-base": "0.7.0",
-    "dotenv": "16.4.5",
     "eslint": "9.9.0",
     "knip": "5.27.2",
     "prettier": "3.3.3",
diff --git a/src/server.ts b/src/server.ts
index 85772b2..9c5fc2f 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -1,5 +1,3 @@
-import dotenv from 'dotenv';
-
 import { SlackEvent } from './entities/Slack';
 import { implementGitHubDeployWebhookController } from './infrastructures/implementGitHubDeployWebhookController';
 import { implementMemberWaffleDotComRepository } from './infrastructures/implementMemberWaffleDotComRepository';
@@ -8,8 +6,6 @@ import { implementSlackPresenter } from './infrastructures/implementSlackPresent
 import { implementDeploymentService } from './services/GithubDeploymentService';
 import { implementSlackEventService } from './services/SlackEventService';
 
-dotenv.config({ path: '.env.local' });
-
 const slackAuthToken = process.env.SLACK_AUTH_TOKEN;
 const slackBotToken = process.env.SLACK_BOT_TOKEN;
 const slackWatcherChannelId = process.env.SLACK_WATCHER_CHANNEL_ID;
diff --git a/src/weekly-dashboard.ts b/src/weekly-dashboard.ts
index 229ffbc..6e3c028 100644
--- a/src/weekly-dashboard.ts
+++ b/src/weekly-dashboard.ts
@@ -1,12 +1,8 @@
-import dotenv from 'dotenv';
-
 import { implementGithubOctokitRepository } from './infrastructures/implementGithubOctokitRepository';
 import { implementMemberWaffleDotComRepository } from './infrastructures/implementMemberWaffleDotComRepository';
 import { implementSlackPresenter } from './infrastructures/implementSlackPresenter';
 import { implementDashboardService } from './services/DashboardService';
 
-dotenv.config({ path: '.env.local' });
-
 const slackAuthToken = process.env.SLACK_AUTH_TOKEN;
 const githubAccessToken = process.env.GHP_ACCESS_TOKEN;
 const slackWeeklyChannelId = process.env.SLACK_WEEKLY_CHANNEL_ID;
@@ -23,7 +19,7 @@ if (githubOrganization === undefined) throw new Error('Missing Github Organizati
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-╚═════╝ ╚══════╝╚═╝     ╚══════╝╚═╝  ╚═══╝╚═════╝ ╚══════╝╚═╝  ╚═══╝ ╚═════╝╚═╝╚══════╝╚══════╝                                    
+╚═════╝ ╚══════╝╚═╝     ╚══════╝╚═╝  ╚═══╝╚═════╝ ╚══════╝╚═╝  ╚═══╝ ╚═════╝╚═╝╚══════╝╚══════╝
  */
 
 const dashboardService = implementDashboardService({