diff --git a/examples/google_cloud_run/flask-gunicorn/main.py b/examples/google_cloud_run/flask-gunicorn/main.py
index 70bf437cb..6b4320d5a 100644
--- a/examples/google_cloud_run/flask-gunicorn/main.py
+++ b/examples/google_cloud_run/flask-gunicorn/main.py
@@ -3,8 +3,10 @@
 
 from slack_bolt import App
 
+# Initialize the Slack app with the bot token from an environment variable
+app = App(token=os.environ.get('SLACK_BOT_TOKEN'))
+
 logging.basicConfig(level=logging.DEBUG)
-app = App()
 
 
 @app.command("/hey-google")
@@ -27,4 +29,4 @@ def slack_events():
 
 # Only for local debug
 if __name__ == "__main__":
-    flask_app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 3000)))
+    flask_app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 3000)))
\ No newline at end of file