I'm experiencing this with Laravel. I'm stuck on 5.2 while they're on v9 now because the author thought it would be a good idea to arbitrarily change some method signatures because he regretted his decisions earlier, while not providing any additional value and I don't have the time to hunt all these down and refactor everything, and I feel unmotivated when he's made it clear he's a bad steward. He refused semver for the longest time, not sure if they're using it now but even if so, 4 more major breaks is not encouraging
There is no reason to be stuck on a previous version of Laravel.
With the help of rector, it should be an afternoon's work to upgrade.