diff --git a/.github/workflows/bot_daily_posting_pyzotero.yml b/.github/workflows/bot_daily_posting_pyzotero.yml
index 1b2d1ff..5be9d73 100644
--- a/.github/workflows/bot_daily_posting_pyzotero.yml
+++ b/.github/workflows/bot_daily_posting_pyzotero.yml
@@ -47,6 +47,13 @@ jobs:
             --zotero_library_id "${{ secrets.ZOTERO_LIBRARY_ID }}" \
             --slack_token "${{ secrets.SLACK_API_KEY }}"
       
+      - name: Upload state file to Google Drive
+        run: |
+          python upload_google_file.py \
+            --file_id "${{ secrets.STATEFILE_FILE_ID }}" \
+            --input_path state.csv \
+            --service_account_file service_account.json
+      
       - name: Upload bot log artifact
         uses:  actions/upload-artifact@v4
         with:
diff --git a/upload_google_file.py b/upload_google_file.py
new file mode 100644
index 0000000..f18fd7d
--- /dev/null
+++ b/upload_google_file.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+import argparse
+import os
+from google.oauth2 import service_account
+from googleapiclient.discovery import build
+from googleapiclient.http import MediaFileUpload
+
+def upload_file(file_id, input_path, service_account_file):
+    """
+    Upload (update) a file on Google Drive using a service account.
+    
+    This function updates the file with ID `file_id` using the local file at `input_path`.
+    It uses a resumable upload to report progress.
+    """
+    if not os.path.exists(service_account_file):
+        raise FileNotFoundError(f"Service account file not found: {service_account_file}")
+    if not os.path.exists(input_path):
+        raise FileNotFoundError(f"Input file not found: {input_path}")
+    
+    # Authenticate using the service account file.
+    credentials = service_account.Credentials.from_service_account_file(
+        service_account_file, scopes=['https://www.googleapis.com/auth/drive']
+    )
+    service = build('drive', 'v3', credentials=credentials)
+    
+    # Prepare the file upload. Adjust the mimetype if your file is not CSV.
+    media = MediaFileUpload(input_path, mimetype='text/csv', resumable=True)
+    
+    # Request to update the existing file on Drive.
+    request = service.files().update(fileId=file_id, media_body=media)
+    
+    response = None
+    while response is None:
+        status, response = request.next_chunk()
+        if status:
+            print(f"Upload progress: {int(status.progress() * 100)}%")
+    print(f"File uploaded successfully from '{input_path}' to file ID '{file_id}'.")
+
+def validate_arguments(args):
+    """Basic validation for user inputs."""
+    if not args.file_id:
+        raise ValueError("--file_id is required.")
+    if not args.input_path:
+        raise ValueError("--input_path is required.")
+    if args.service_account_file and not os.path.exists(args.service_account_file):
+        raise FileNotFoundError(f"Service account file not found: {args.service_account_file}")
+
+def main():
+    # Parse command-line arguments
+    parser = argparse.ArgumentParser(description="Upload (update) a file on Google Drive using a service account.")
+    parser.add_argument("--file_id", required=True, help="The ID of the Google Drive file to update.")
+    parser.add_argument("--input_path", required=True, help="The local path of the file to upload.")
+    parser.add_argument(
+        "--service_account_file", 
+        default="./service_account.json", 
+        help="Path to the service account JSON file (default: ./service_account.json)."
+    )
+    
+    args = parser.parse_args()
+
+    # Validate arguments
+    try:
+        validate_arguments(args)
+    except Exception as e:
+        print(f"Error: {e}")
+        return
+
+    # Upload the file
+    try:
+        upload_file(args.file_id, args.input_path, args.service_account_file)
+    except Exception as e:
+        print(f"Failed to upload file: {e}")
+
+if __name__ == "__main__":
+    main()