diff --git a/app.py b/app.py
index c9c346a..9ef9ca4 100644
--- a/app.py
+++ b/app.py
@@ -7,7 +7,8 @@ import os
 
 app = Flask(__name__)
 app.config['SECRET_KEY'] = os.urandom(24)
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
+# Use DATABASE_URL from environment if available, else default to SQLite
+app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('DATABASE_URL', 'sqlite:///site.db')
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 app.config['UPLOAD_FOLDER'] = 'static/uploads'
 app.config['MAX_CONTENT_LENGTH'] = 2 * 1024 * 1024  # 2MB max file size