I have gcalctool 6.4.1.1 on Ubuntu 12.04   

I am using the Currency conversion in Financial mode.

Got to know from [Launchpad Answers](https://answers.launchpad.net/ubuntu/+source/gcalctool/+question/141205) that the tool updates the rates from European Central Bank every 7 days.  

I would like to know if i can force update the rates.