Plateaus are so frustrating. One thing you can do is shock your body by changing your diet for awhile. Go low carb at night for a couple of weeks by eating just plenty of lean protein and some leafy veggies or salad and cut out the potatoes,pasta,bread,rice type plate fillers altogether. (It's a bit hard for most of us to contemplate dinner without these items, but it will give your weight loss a nudge).
Another good thing to do is to alter your exercise routine - try throwing in one or two high intensity interval training type activities in the week, like if you go walking, find a few sets of steps or a couple of hills to challenge you. Our cunning bodies very quickly adapt to "steady state" diet and exercise programs and learn how to conserve energy (fat deposits) if we don't outsmart them