Every time you log in to the Magento Admin Panel, you see an admin notification popop message telling you there's a new Magento version. As a developer, it's best to stay informed about new releases by reading blogs, tweets and lots of other news channels - besides this, upgrades should never be taken lightly. It's possible to remove this notification popup message.
To remove this notification popup message.
- Login to your Magento Admin Panel
- Go to System >> Configuration >> Advanced
- Disable the Mage_AdminNotification module