Why flash plugin is not updating?

I don't know why the flashplugin-nonfree isn't updating, but I have one solution:

1. First, install the flashplugin: sudo apt-get install flashplugin-nonfree
2. Then, download the latest version of flash from adobe site (https://get.adobe.com/br/flashplayer/otherversions/) .. USE .TAR.GZ version!
3. Extract the file libflashplayer.so from the tar.gz and put it on /usr/lib/flashplugin-nonfree , replacing the older one.
4. Check if you have the latest version working: sudo update-flashplugin-nonfree --status
5. Enjoy!

The update signatures aren't available yet; flashplugin-nonfree checks these to make sure the files being installed are OK (i.e. you're not downloading corrupted files). A bug already exists for this, you need to wait for the maintainer to react (or install the plugin manually).