It should be noted that a reboot should be done so your systems starts with the new packages/libraries.
Updating doesn't mean you are automatically running the new installed files. Some people mistake an upgrade for a fully updated kernel/services running in memory. Some you can get away with by restarting the services.
If you happen to be on a zypper package manager run zypper ps -s, it will list packages that have been installed but are pending a restart, moreso it notes things running on deleted files.
Maybe there is a similar command for apt