If this does not help, then tamp boots with old newspapers. Then thoroughly soaked with water and put out to dry in a warm place, but not near the battery. After about two days can pull out the paper and try a new thing. If they are not increased in size, repeat all over again, but tamp slightly more newspapers in the shaft. This method helps to stretch the boots made of genuine leather as well as of other synthetic materials. Do not forget to put on them water-repellent cream before going out.
When the water does not help to solve the problem, there is still a fallback - special extensions for footwear that is sold in hardware stores. Put it on the shaft, put on boots and walk until complete evaporation of the liquid. Of course, you can write them and newspapers, but it was on foot, they acquire the desired shape. From the first time stretching can not help, apply it again if required.
When all else fails - wear boots in a shoe shop. Shoemaker bootleg to increase the size you want at a reasonable cost. The very next day, you can go to the new thing without discomfort. In some cases, stretching a shoe repair shop may take more time, it all depends on the workload of the master and the method of treatment of the material.