The package backoff 1.11.1-0kali1~jan+nur2 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: Mon, 16 Aug 2021 22:29:30 -0000 Source: backoff Architecture: source Version: 1.11.1-0kali1~jan+nur2 Distribution: kali-experimental Urgency: low Maintainer: Kali Developers <[email protected]> Changed-By: Kali Janitor <[email protected]> Changes: backoff (1.11.1-0kali1~jan+nur2) kali-experimental; urgency=low . * New upstream release. * Build for debian-janitor apt repository. Checksums-Sha1: c34deee47ba6ddabd43d9c0dd12c354986cbc2b2 1919 backoff_1.11.1-0kali1~jan+nur2.dsc 2834e4893fb3f937518fcb7c1e06cb1702450c49 17581 backoff_1.11.1.orig.tar.gz 4bd01d5d9c671698fdbf3d3d49a2d4f641bdc098 2956 backoff_1.11.1-0kali1~jan+nur2.debian.tar.xz Checksums-Sha256: a27ce3b2cb7180a8a81bcece3a0741cbd36b9e39f0c19eed74c709fc6c547142 1919 backoff_1.11.1-0kali1~jan+nur2.dsc 29170f1628bfa61e9d37a84ac274fec48211331e6b0f0df7eb8fa6d624446f70 17581 backoff_1.11.1.orig.tar.gz fecfefddafbaa9cfa6704711d825221cce6ee7580c705e336b917095994c7a01 2956 backoff_1.11.1-0kali1~jan+nur2.debian.tar.xz Files: 37c799a91825d3044c6b970fa4209ff6 1919 python optional backoff_1.11.1-0kali1~jan+nur2.dsc a56ff28f9d90ffa9b7f4813f159629e7 17581 python optional backoff_1.11.1.orig.tar.gz 9ab7576e830158b0b3eb3a5f53bcb2ec 2956 python optional backoff_1.11.1-0kali1~jan+nur2.debian.tar.xz -----BEGIN PGP SIGNATURE----- iQHFBAEBCgAvFiEES09zQYVZp+q1h39IpZnvjcfYkGkFAmEa6GgRHGphbml0b3JA a2FsaS5vcmcACgkQpZnvjcfYkGkvNQv7B0cc8PYUjgQZfMJI259n7iP02FQ1x6PJ 5CtyMFBLSx+kTal+h/9jYnbl6ximaURpNS3vG5Gm6uwJxZ1/CPVmsB/t9qdKDMZx WREQTyHa0FSg1fFzr1We/STaHYnbUqRNWSlbzAbjvNo1Pff2X10v9tJB0qzJAXvd DINT77Sm7t0Ov8HjPbeY3p3IFMcbr9cbj/yoMGsMrZjRMuBABP1y8wWnhhlG3hkX jfe7+7h0v9H2zQSDbEO+WTbzfteqFhQK+bilyeJrHQp6tkDEVLiO9lnlJkqni9gd asQKM2s8gwNAzeXYRZPdqpsDE1sDQxfhrGR1f97ctoP8RKYS0KIgzfehLbmJ+zSP OoF7FhR1gaWghz1V1GRlLltVjdda2vLmmPAXLezwtvolkKUn1ut9eN9ljoi9U/lO ZJQmxR4YoiLS67MHQPsvap8magZs+m3C9xmKppWzzpD8Yyo1TUiIX9i8Z57GsxEK lr2IyqGiNNmsdwVKRv1DWmuZsahbpMoz =Jtqu -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff