To update to the latest 5.5 image profile directly from the VMware online repository (requires internet access for the host) do this:
# esxcli network firewall ruleset set -e true -r httpClient
# esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/vmw-depot-index.xml -p ESXi-5.5.0-20151004001-standard
If your ESXi host does not have direct internet access, then download the ESXi 5.5 Update 3a Offline Bundle from here and upload it to the host:
https://my.vmware.com/group/vmware/details?downloadGroup=ESXI55U3&productId=353&rPId=9553
Then apply the update with:
# esxcli software vib update -d "/full/path/to/offline/bundle.zip"
Also see:
VMware KB: Installing patches on an ESXi 5.x/6.x host from the command line
Both methods will update every ESXi package on host to the latest version.
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