This is a problem for any project, and yet another reason to prefer static files for as much as your stack as possible and do not follow the latest tech-stack trends too closely. It is called the bleeding edge because it is covered in the blood of dead projects that cannot be maintained.

My advice is to use as few technologies in your stack as possible. Sure, your project might work best with a relational db and a dedicated document store but it might be less ongoing effort to emulate one with the other.

And freeze (or at least document) the versions of any dependencies for release. Your project runs fine with CoolTech.1.4 now but in 5 years when you come to rebuild you will find that the interface to CoolTech.6.44 is completely different.

And even then things might fail. 20+ years ago I made some Java applets that were well received and useful. Technically they still work (I think) but nobody runs Java in the browser so those projects have been unusable for years. We can be smug about our pure HTML5 static sites now but who knows what the browser landscape will be like in 2050.