The package backoff 1.11.1-0kali1~jan+nur5 migrated to kali-experimental. The .changes file shown below gives you more information about this new version: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Thu, 19 Aug 2021 21:25:51 -0000 Source: backoff Architecture: source Version: 1.11.1-0kali1~jan+nur5 Distribution: kali-experimental Urgency: low Maintainer: Kali Developers <[email protected]> Changed-By: Kali Janitor <[email protected]> Changes: backoff (1.11.1-0kali1~jan+nur5) kali-experimental; urgency=low . * New upstream release. * Build for debian-janitor apt repository. Checksums-Sha1: edfe01fbaf68b78c0d138acffeafa9de69d25674 1919 backoff_1.11.1-0kali1~jan+nur5.dsc 2834e4893fb3f937518fcb7c1e06cb1702450c49 17581 backoff_1.11.1.orig.tar.gz d5662f97ea9509e8b43795a727f0c3022d5008f1 2960 backoff_1.11.1-0kali1~jan+nur5.debian.tar.xz Checksums-Sha256: 46eb9d3540729fb6ca3abed59c8d0091aaa6e8ec3347c2e50fb9f08c26700357 1919 backoff_1.11.1-0kali1~jan+nur5.dsc 29170f1628bfa61e9d37a84ac274fec48211331e6b0f0df7eb8fa6d624446f70 17581 backoff_1.11.1.orig.tar.gz 1bb9000a8d04474e2b824f5c8f0ce8cb0b577a53838ff2c7669018ae2542d06e 2960 backoff_1.11.1-0kali1~jan+nur5.debian.tar.xz Files: 65ea3a15dc6d4ac4b7d6b5aef0f41257 1919 python optional backoff_1.11.1-0kali1~jan+nur5.dsc a56ff28f9d90ffa9b7f4813f159629e7 17581 python optional backoff_1.11.1.orig.tar.gz 8d0a03657bb08b99414a3abee15feaf6 2960 python optional backoff_1.11.1-0kali1~jan+nur5.debian.tar.xz -----BEGIN PGP SIGNATURE----- iQHFBAEBCgAvFiEES09zQYVZp+q1h39IpZnvjcfYkGkFAmEezeERHGphbml0b3JA a2FsaS5vcmcACgkQpZnvjcfYkGlSCwv/RHKEIVEAgMVP/buGPHjQvsZ1nlzifcdy qCMnr4FLcpggEV5E7memaG2QYbQGrhsB9r9cRb0FSDXts55OhQJ4uS+69exUqSAV GFmvP7sRcU5PR7hsCgV/O6t/f0cNrWpozfJ7m/2w79vuUBSlApBUKV5AdaDuM5dB 7TtmXeIHDkxjasprw+8xLZcjKtCMAwkkB4dYwSd9nVDMB3JMinFkYomS729cKVyH VyIy4lepr2Ttg7/7/ZVvVjbRhn+9NHJ66Qsmhz3dqzd6XPNqX9nbd/ntGjKETifZ 82tXBWcRmXcPV5+C+0FJCjH/9Jg4EQC+zWzu8UrFbH59a9kfFUWqh5zTuRfRou9g QpPAP60xQqkJg1A75WcgjnV77Zul7UaHI59OWSarcRkwdXq0OJ11tEjSb1tHUn6I k8ze8ncyN0DRI6JgomBQVQM8pwiQY2MuGvRXVc7z7BDKfxO5TRp7aqvTMCwZgOeE 2MGlet1t5HfEU/I4qVN664BeAV/gljLc =gSy+ -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff