A new feature release 3.3.12 is available. Please read the release announcement to learn about what it has to offer, and how to upgrade.

phpBB 3.3.11 설치해서 쓰고 있었는데...

A new feature release 3.3.12 is available. Please read the release announcement to learn about what it has to offer, and how to upgrade.

라고 나온다. 

겁 난다. 업그레이드 하다가 잘못되어서 다 날아가 버릴까봐.