The syntax in the /etc/src2pkg.conf file has changed. If you already have a previous version of src2pkg installed, you should remove or change the name of the old src2pkg.conf file before upgrading the src2pkg package.
The src2pkg-helpers version has been upgraded, so if you have a previous version of src2pkg installed, you'll need to run the command: src2pkg --setup as user root after upgrading to this version of src2pkg.
The version of the libsentry program and library has been upgraded. This requires the src2pkg-helpers package to be upgraded for use with src2pkg. src2pkg now includes code which detects the version of any installed package of src2pkg-helpers and notifies the user of the need to upgrade when the new src2pkg version is installed. The old src2pkg-helpers does not have to be manually removed. Simply running src2pkg --setup after src2pkg is installed will build and package the new src2pkg-helper and install the package.