wbntff you may try this trick..
On cpanel, back to home dir you would find a folder by name: .composer , delete all files inside this folder and files inside the sub 2 folders. Delete all files but not the folders.
2nd, go to public_html dir, here delete the folder: vendor , then delete files inside the sub folders in storage folder. (files in cache, logs, less, formatter, session e.t.c)
Then now run composer update
The site would pick on everything latest.
