Z:gnu-www-ja-gpl-faq--2b8830-4: If you have the ability to/en

4: If you have the ability to release the project under LGPLv2.1 or any later version, you can choose to release it under LGPLv3 or any later version&mdash;and once you do that, you'll be able to incorporate the code released under LGPLv3.