Duplicity issued a new stable version with a few bugfixes. I didn't want to wait for the Debian sid package to update so I updated it myself.
This was very simple as the Debian duplicity package uses dpatch to manage all the patches to the original source code. The patches go to debian/patches.
When the package is built debian/rules applies these patches:
Creating a new dpatch is also automated::
# 1. create a new patch: invokes a new shell. Edit files and exit # when you're done dpatch-edit-patch <patch_name>