Resolving dependencies with different pageage version

[syip]

Hi, I am trying to install certbot in my Archarm v7 and got a error:
error: failed retrieving file 'python2-cryptography-1.5-1-armv7h.pkg.tar.xz' from mirror.archlinuxarm.org : The requested URL returned error: 404

I tried to google it and I found that in
http://us.mirror.archlinuxarm.org/armv7h/extra/
that is a package call python2-cryptography-1.5.1-1-armv7h.pkg.tar.xz

Please note that the version are different. May I know how could I install certbot?

[WarheadsSE]

Apparently, your package indexes are out of date.