1. Download the latest patch from https://www.vmware.com/patchmgr/findPatch.portal
2. Upload this file to the datastore visible by your ESXi host.
3. Put your host in maintenance mode (right click > enter maintenance mode) and connect via putty. Note that SSh must be enabled. (configuration > security profile > properties > ssh). Now run this command to update the host:
esxcli software vib update -d /vmfs/volumes/
Reboot your host and exit maintenance mode.