error update form 4.3.7 to 4.4

If you use v4.3.7, read the all related upgrading guides and do the things needed:
https://codeigniter4.github.io/CodeIgnit...e_438.html
https://codeigniter4.github.io/CodeIgnit...e_440.html
https://codeigniter4.github.io/CodeIgnit...e_441.html
https://codeigniter4.github.io/CodeIgnit...e_442.html
https://codeigniter4.github.io/CodeIgnit...e_443.html

Thanks for you're reply!
I have found out that I am using version 4.3.6.
My question is should Composer have taken care for a smooth upgrade? 
Now I have to rebuild 3 different projects from the ground, that cannot be the intention of (using) a framework?