cannot install arachni (1.4-0kali2) - unmet dependencies

Hi:
After sorting out (I thought) my dist-upgrade, I had held back package (arachni).
I tried removing and then installing, but get unmet dependency:

Code:

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root@kali:~# cat /etc/apt/sources.list
deb http://http.kali.org/kali kali-rolling main non-free contrib

root@kali:~# apt-get update && apt-get dist-upgrade
Hit:1 http://ftp.hands.com/kali kali-rolling InRelease
Reading package lists... Done
Reading package lists... Done
Building dependency tree     
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

root@kali:~# apt-get install arachni
Reading package lists... Done
Building dependency tree     
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 arachni : Depends: ruby-watir-webdriver (>= 0.8.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

root@kali:~# apt-get -f install
Reading package lists... Done
Building dependency tree     
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

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And 'apt-mark showhold' returns nothing,
Any clues anyone?