The package backoff 1.11.1-0kali1~jan+nur7 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: Tue, 24 Aug 2021 23:55:11 -0000 Source: backoff Architecture: source Version: 1.11.1-0kali1~jan+nur7 Distribution: kali-experimental Urgency: low Maintainer: Kali Developers <[email protected]> Changed-By: Kali Janitor <[email protected]> Changes: backoff (1.11.1-0kali1~jan+nur7) kali-experimental; urgency=low . * New upstream release. * Build for debian-janitor apt repository. Checksums-Sha1: 9d568a51d8ce7b7f1f781d66252c94f1707853a1 1919 backoff_1.11.1-0kali1~jan+nur7.dsc 2834e4893fb3f937518fcb7c1e06cb1702450c49 17581 backoff_1.11.1.orig.tar.gz 2a209ff25ee19f01af6505f47892b60d1fab8e16 2960 backoff_1.11.1-0kali1~jan+nur7.debian.tar.xz Checksums-Sha256: 800d39ed730438237994bd07f01f4ae259e9ec7f9b27ec605fead23045389723 1919 backoff_1.11.1-0kali1~jan+nur7.dsc 29170f1628bfa61e9d37a84ac274fec48211331e6b0f0df7eb8fa6d624446f70 17581 backoff_1.11.1.orig.tar.gz 69c5b878c71a14ed444ccf7e9e54d431c0831a6409bd19e8df04f3853df85fd6 2960 backoff_1.11.1-0kali1~jan+nur7.debian.tar.xz Files: cf0abf531c5549044c15af638ebb36bf 1919 python optional backoff_1.11.1-0kali1~jan+nur7.dsc a56ff28f9d90ffa9b7f4813f159629e7 17581 python optional backoff_1.11.1.orig.tar.gz ca2792473672bfb2739ec86579b3c1ac 2960 python optional backoff_1.11.1-0kali1~jan+nur7.debian.tar.xz -----BEGIN PGP SIGNATURE----- iQHFBAEBCgAvFiEES09zQYVZp+q1h39IpZnvjcfYkGkFAmEliJsRHGphbml0b3JA a2FsaS5vcmcACgkQpZnvjcfYkGkgIgv/WtmyBvnHs9q6b/4ppFDQv4d92OIuDBuF BGjXweMVgzuAXVAhx8llycGsQlwLEk7fWZB8DQMc7qQIvzymIii8Q/t0WfUqLHX3 h+1J9n4952wK4+REI1d8GSIt+7bI4iBFft3mB4I9A5IEVOnDy8CjFy5kArA9CxJt ENamsButW/e9qlAr2kWCw2PtpMQ8cxj0yoWMQVlYy2cIyfSDRJKf2xuV2eiZIS6g RbRLkn22fKIRoxPFGgvjul7vIYmWjhSDimDORCA4BU94GUkb/NKCc9iF+P/Wg7i5 5ANCjdPEtGikwWdrclpeS1RiluQiShGdi08hbl63lGaRJvz/24rgBlFaVPFabOMz kQC229jDsDZ0TRiPm4FmYt2z4IZzNoWe4mtLYxur+pPu7LKq3n2mis4C5fQu6nz/ ZLhLhzerrfyKG+iZRPYJdRPey67t+Ev2eGEt7+xP/mXkF4KH7n4WaS3XpfRBONES FyfY60qj79LCA7n6PXesqLLAA+D/P1s3 =2/pl -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff