Keep Slackware up to date in a few simple steps.
Slackpkg is an automated (for the most part) tool to do just that. In the /extra directory on a Slackware mirror you can find it. Download slackpkg for your version and do the following as root after it is installed.
Edit /etc/slackpkg/mirrors. Read the top of the file for information on this. Basically you need to un-comment a mirror of choice. You should also list any package you don’t want upgraded in the file /etc/slackpkg/blacklist.
Run slackpkg update to get the current file listing:
Once it is done do the deed, here we check everything:
Follow the prompts from there.