Gibson just has to hold on to the football. He's had more drops in his limited opportunities in 2014 than he had all of last season (when he had just one).
I do feel like our receiving corps, while better than any we've had in a long time, just isn't particularly well constructed. Gibson, Hartline, and Landry all seem to fill sort of the same role to me, except Hartline has better chemistry with the QB and Landry can actually catch a contested football and keep his feet. That leaves Gibson sort of lost in the shuffle and he hasn't made the best of his opportunities.