Keep getting Invalid version: 'unstable-2022-01-20'

[CodeWithOz]

I keep getting this error packaging.version.InvalidVersion: Invalid version: 'unstable-2022-01-20' when trying to start up my nix environment. Below is a more complete stack trace of the error:

Stack trace

building '/nix/store/911dvip5w647kdq0pxiwsahlgg01wqa7-mach_nix_file.drv'...
Traceback (most recent call last):
  File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/generate.py", line 110, in <module>
    main()
  File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/generate.py", line 103, in main
    do()
  File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/generate.py", line 46, in do
    nixpkgs = NixpkgsIndex(nixpkgs_json)
  File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/data/nixpkgs.py", line 32, in __init__
    version = parse_ver(nix_data["version"])
  File "/nix/store/ixxrk9r5yvdmqfcp4axk9nb6gzjaby5y-python3-3.9.16-env/lib/python3.9/site-packages/packaging/version.py", line 52, in parse
    return Version(version)
  File "/nix/store/ixxrk9r5yvdmqfcp4axk9nb6gzjaby5y-python3-3.9.16-env/lib/python3.9/site-packages/packaging/version.py", line 197, in __init__
    raise InvalidVersion(f"Invalid version: '{version}'")
packaging.version.InvalidVersion: Invalid version: 'unstable-2022-01-20'
error: builder for '/nix/store/911dvip5w647kdq0pxiwsahlgg01wqa7-mach_nix_file.drv' failed with exit code 1;
       last 10 log lines:
       >     do()
       >   File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/generate.py", line 46, in do
       >     nixpkgs = NixpkgsIndex(nixpkgs_json)
       >   File "/nix/store/bl1hg4jv6m0xqaqzlfifs4ykqqd0g9jv-596icq9xnd5b4qipna0rv458y4vgrq5r-mach-nix-src/mach_nix/data/nixpkgs.py", line 32, in __init__
       >     version = parse_ver(nix_data["version"])
       >   File "/nix/store/ixxrk9r5yvdmqfcp4axk9nb6gzjaby5y-python3-3.9.16-env/lib/python3.9/site-packages/packaging/version.py", line 52, in parse
       >     return Version(version)
       >   File "/nix/store/ixxrk9r5yvdmqfcp4axk9nb6gzjaby5y-python3-3.9.16-env/lib/python3.9/site-packages/packaging/version.py", line 197, in __init__
       >     raise InvalidVersion(f"Invalid version: '{version}'")
       > packaging.version.InvalidVersion: Invalid version: 'unstable-2022-01-20'
       For full logs, run 'nix log /nix/store/911dvip5w647kdq0pxiwsahlgg01wqa7-mach_nix_file.drv'.

This is my sources.json file:

sources.json

{
    "gitignore": {
        "branch": "master",
        "description": "Nix functions for filtering local git sources",
        "homepage": "",
        "owner": "hercules-ci",
        "repo": "gitignore.nix",
        "rev": "bff2832ec341cf30acb3a4d3e2e7f1f7b590116a",
        "sha256": "0va0janxvmilm67nbl81gdbpppal4aprxzb25gp9pqvf76ahxsci",
        "type": "tarball",
        "url": "https://github.com/hercules-ci/gitignore.nix/archive/bff2832ec341cf30acb3a4d3e2e7f1f7b590116a.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "mach-nix": {
        "branch": "3.5.0",
        "description": "Create highly reproducible python environments",
        "homepage": "",
        "owner": "DavHau",
        "repo": "mach-nix",
        "rev": "7e14360bde07dcae32e5e24f366c83272f52923f",
        "sha256": "185qf6d5xg8qk1hb1y0b5gggr71vdz8v9d5ga4zg7dmcb1aypxcg",
        "type": "tarball",
        "url": "https://github.com/DavHau/mach-nix/archive/7e14360bde07dcae32e5e24f366c83272f52923f.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "niv": {
        "branch": "master",
        "description": "Easy dependency management for Nix projects",
        "homepage": "https://github.com/nmattia/niv",
        "owner": "nmattia",
        "repo": "niv",
        "rev": "82e5cd1ad3c387863f0545d7591512e76ab0fc41",
        "sha256": "090l219mzc0gi33i3psgph6s2pwsc8qy4lyrqjdj4qzkvmaj65a7",
        "type": "tarball",
        "url": "https://github.com/nmattia/niv/archive/82e5cd1ad3c387863f0545d7591512e76ab0fc41.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "nixpkgs": {
        "branch": "nixos-23.05",
        "description": "Nix Packages collection",
        "homepage": "",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "4ecab3273592f27479a583fb6d975d4aba3486fe",
        "sha256": "10wn0l08j9lgqcw8177nh2ljrnxdrpri7bp0g7nvrsn9rkawvlbf",
        "type": "tarball",
        "url": "https://github.com/NixOS/nixpkgs/archive/4ecab3273592f27479a583fb6d975d4aba3486fe.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "pypi-deps-db": {
        "branch": "master",
        "description": "Probably the most complete python dependency database",
        "homepage": "",
        "owner": "DavHau",
        "repo": "pypi-deps-db",
        "rev": "570d3543eb53dad7d1eb0bb88ecbcf450bc69847",
        "sha256": "1xhk812r208ppz325wxhzksqjalka6n1sdqgag5x8ilfj506pgr6",
        "type": "tarball",
        "url": "https://github.com/DavHau/pypi-deps-db/archive/570d3543eb53dad7d1eb0bb88ecbcf450bc69847.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    }
}

This began to happen after I updated the revs and sha sums of both nixpkgs and pypi-deps-db. The previous revs were e64df9c5c8ffa0c9a82006e410ad630e32e6063d and c6a6acdbc1320cbb36d0fee0be00a0c5baf76ad9, respectively. Any idea what's going on or suggestions I could try?