You can focus on solid, timeless theories, and use Google Scholar or journal alerts to track new research right up to submission. And try to add a “recent developments” section to discuss any fresh trends. Reviewing recent dissertations in your field can also help you spot new insights and keep your work up-to-date.

That is simply said: not possible. Once you publish - due to the production process - time goes on, and hence, new developments and more recent publication on the topic will emerge. Fact of life.