diff --git a/.github/workflows/deploy_api.yml b/.github/workflows/deploy_api.yml
index ea36011c..5ae0a0cc 100644
--- a/.github/workflows/deploy_api.yml
+++ b/.github/workflows/deploy_api.yml
@@ -10,9 +10,9 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - uses: akhileshns/heroku-deploy@v3.13.15 # This is the action
-        with:
-          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
-          heroku_app_name: "case-study-sales-api" #Must be unique in Heroku
-          heroku_email: "kakimomokuri@gmail.com"
-          appdir: "api" # <- This will point to the api folder in your project
+      - name: Deploy to Heroku
+        env:
+          HEROKU_API_KEY: ${{ secrets.HEROKU_API_KEY }}
+        run: |
+          git remote add heroku https://git.heroku.com/${{ secrets.HEROKU_APP_NAME }}.git
+          git subtree push --prefix api heroku main  # mainブランチをHerokuのmasterブランチにデプロイ