you could try a pattern like that. use index to fret the 9 ring for 11 and pinky for 12. play that down and back up. get comfortable then try moving the pattern up a fret, until your playing with your index at the first fret and pinky on the 4th
or play VI's fret for example the 10th fret E string with your pinky and and play a VI at the 9th fret D string with your ring finger. not only will it work your pinky out but your ring finger will work a ton also