The package backoff 1.11.1-0kali1~jan+nur4 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: Wed, 18 Aug 2021 23:38:20 -0000 Source: backoff Architecture: source Version: 1.11.1-0kali1~jan+nur4 Distribution: kali-experimental Urgency: low Maintainer: Kali Developers <[email protected]> Changed-By: Kali Janitor <[email protected]> Changes: backoff (1.11.1-0kali1~jan+nur4) kali-experimental; urgency=low . * New upstream release. * Build for debian-janitor apt repository. Checksums-Sha1: 7c1443c58adc446517f6777727e36809f0db4413 1919 backoff_1.11.1-0kali1~jan+nur4.dsc 2834e4893fb3f937518fcb7c1e06cb1702450c49 17581 backoff_1.11.1.orig.tar.gz 2e176735c3d2585f4275198e4978e27c19aba593 2956 backoff_1.11.1-0kali1~jan+nur4.debian.tar.xz Checksums-Sha256: f02598c3caa187a16a507194cc6b61ec93baa5dd7eeadc2e1b198f41ae352218 1919 backoff_1.11.1-0kali1~jan+nur4.dsc 29170f1628bfa61e9d37a84ac274fec48211331e6b0f0df7eb8fa6d624446f70 17581 backoff_1.11.1.orig.tar.gz 0ca8bdc50872a2c60bfdaf010c57ca27a2a05231e84103d30dcecf2508ae2895 2956 backoff_1.11.1-0kali1~jan+nur4.debian.tar.xz Files: b152b9b10767b96d77afe276264871c7 1919 python optional backoff_1.11.1-0kali1~jan+nur4.dsc a56ff28f9d90ffa9b7f4813f159629e7 17581 python optional backoff_1.11.1.orig.tar.gz 0a8cc12788c8ccce4ff954f4c964ece5 2956 python optional backoff_1.11.1-0kali1~jan+nur4.debian.tar.xz -----BEGIN PGP SIGNATURE----- iQHFBAEBCgAvFiEES09zQYVZp+q1h39IpZnvjcfYkGkFAmEdnAsRHGphbml0b3JA a2FsaS5vcmcACgkQpZnvjcfYkGk0PQv/SX2APhH+gJG4JTpvCVRf03n/0UH2RlP5 FqATEZs0yEbdy4XBxf557x37dGyb4CkD0GkV9fvJHmbg3WxTm/Bn/sh4AYGGzeOr 6qAjekQldivnZfHSZhx3ff37ri7muoh259ORSIF/+Pa2YgsbtaMboqGujixCzvpr wdon6asOKRdh98x5RbP4E2qN1/iJCnU9FrRwUp/MR947anQxwXo1f8ELS8ctGDbs j8YcNk9LSIucGxRNbpiUUdYJIi83DPBWYsH3ezrdG+0X9sYSZQHfXpCaoHIYKDSX iW2BW1d873W/l0yl8kx7h0qv4/VvD8hHawmjHGyVSRYXKexfBw1OW5wb/MB+ZZmJ g0y/VHCBQTM+Mu6MhNBc7zs8NnPSbzBI9dM4usqy2zAdGS7xevoCKRe0MYVUOIL2 RUR7eZ9pBvu/xTIydf7+bcBF4vraZSxjof2Bb9YZh1D4a0p1XddIxq2TEVrwYMCB Wv1GBtho/0QfGzu0bqhOm5Hvwv82yVxL =VmbR -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff