The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line http://code.google.com/p/spi/downloads/list?can=1 .*/spi-src-(\d[\d.]*)\.(?:zip|tgz|tbz2|txz|tar\.gz|tar\.bz2|tar\.xz)