How do I upgrade pear from 1.4.9 to the latest version?

It's now

pear upgrade --force --alldeps http://pear.php.net/get/PEAR-1.10.1

Then upgrade the rest

pear clear-cache
pear update-channels
pear upgrade
pear upgrade-all

pear upgrade --force http://pear.php.net/get/PEAR-1.9.0

I am using Debian 8 and apt-get install php-pear only installs 1.9.

I then found this works:

pear upgrade pear

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