npm outdated and npm update doesn't work

I want to check if my modules are Latest

i do: sudo npm outdated

and I have this results

Package              Current  Wanted  Latest  Location

oauth                  0.9.9   0.9.9  0.9.10  twit > oauth
require-all            0.0.3   0.0.3   0.0.8  mysql > require-all
bignumber.js           1.0.1   1.0.1   1.3.0  mysql > bignumber.js
request               2.27.0  2.27.0  2.30.0  facebook-chat > node-xmpp > node-xmpp-client > request
through                2.2.7   2.2.7   2.3.4  facebook-chat > node-xmpp > brfs > through

then i do this:sudo npm update but if I repeat sudo npm outdated i have the same results... also if I do for example Info:

Package              Current  Wanted  Latest  Location
oauth                  0.9.9   0.9.9  0.9.10  twit > oauth

Then Update

sudo npm update oauth

Then

sudo npm outdated oauth

My Result:

Package  Current  Wanted  Latest  Location
oauth      0.9.9   0.9.9  0.9.10  twit > oauth