When apps update, they typically get larger. Also, many apps accumulate large cache storage (often unnecessarily). There's not much you can do about growing app size, unless you have the option to uninstall updates. However, there are many good cache cleaning apps available on Google Play - check them out. If you prefer, you can also clear cache manually. Go into Settings > Manage apps > All. Next, press the Menu key and select Sort by size. The largest memory hogs will be listed at the top. Go through each one and Clear cache.