fetchTarball {
  url = "https://github.com/NixOS/nixpkgs/archive/3140fa89c51233397f496f49014f6b23216667c2.tar.gz";
  sha256 = "18p0d5lnfvzsyfah02mf6bi249990pfwnylwhqdh8qi70ncrk3f8";
}

fetchTarball {
  url = "https://github.com/NixOS/nixpkgs/archive/b0bbacb52134a7e731e549f4c0a7a2a39ca6b481.tar.gz";
  sha256 = "15ix4spjpdm6wni28camzjsmhz0gzk3cxhpsk035952plwdxhb67";
}

Upgrade to latest commit in nixos-unstable channel
Upgrade to latest commit in nixos-unstable channel

- db                               5.3.28
  git                              2.24.0   -> 2.24.1
  libffi                           3.2.1    -> 3.3
  nghttp2                          1.39.2   -> 1.40.0
  pcre2                            10.33    -> 10.34
  perl                             5.30.0   -> 5.30.1
- perl5.30.0-CGI                   4.44
- perl5.30.0-CGI-Fast              2.15
- perl5.30.0-Encode-Locale         1.05
- perl5.30.0-FCGI                  0.78
- perl5.30.0-FCGI-ProcManager      0.28
- perl5.30.0-File-Listing          6.04
- perl5.30.0-HTML-Parser           3.72
- perl5.30.0-HTML-TagCloud         0.38
- perl5.30.0-HTML-Tagset           3.20
- perl5.30.0-HTTP-Cookies          6.04
- perl5.30.0-HTTP-Daemon           6.01
- perl5.30.0-HTTP-Date             6.02
- perl5.30.0-HTTP-Message          6.18
- perl5.30.0-HTTP-Negotiate        6.01
- perl5.30.0-IO-HTML               1.001
- perl5.30.0-LWP-MediaTypes        6.04
- perl5.30.0-Net-HTTP              6.19
- perl5.30.0-TermReadKey           2.38
- perl5.30.0-Test-Fatal            0.014
- perl5.30.0-Test-Needs            0.002006
- perl5.30.0-Test-RequiresInternet 0.05
- perl5.30.0-Try-Tiny              0.30
- perl5.30.0-URI                   1.76
- perl5.30.0-WWW-RobotRules        6.02
- perl5.30.0-libwww-perl           6.39
+ perl5.30.1-CGI                               4.44
+ perl5.30.1-CGI-Fast                          2.15
+ perl5.30.1-Encode-Locale                     1.05
+ perl5.30.1-FCGI                              0.78
+ perl5.30.1-FCGI-ProcManager                  0.28
+ perl5.30.1-File-Listing                      6.04
+ perl5.30.1-HTML-Parser                       3.72
+ perl5.30.1-HTML-TagCloud                     0.38
+ perl5.30.1-HTML-Tagset                       3.20
+ perl5.30.1-HTTP-Cookies                      6.07
+ perl5.30.1-HTTP-Daemon                       6.01
+ perl5.30.1-HTTP-Date                         6.05
+ perl5.30.1-HTTP-Message                      6.18
+ perl5.30.1-HTTP-Negotiate                    6.01
+ perl5.30.1-IO-HTML                           1.001
+ perl5.30.1-LWP-MediaTypes                    6.04
+ perl5.30.1-Net-HTTP                          6.19
+ perl5.30.1-TermReadKey                       2.38
+ perl5.30.1-Test-Fatal                        0.014
+ perl5.30.1-Test-Needs                        0.002006
+ perl5.30.1-Test-RequiresInternet             0.05
+ perl5.30.1-Time-Local                        1.28
+ perl5.30.1-TimeDate                          2.30
+ perl5.30.1-Try-Tiny                          0.30
+ perl5.30.1-URI                               1.76
+ perl5.30.1-WWW-RobotRules                    6.02
+ perl5.30.1-libwww-perl                       6.42
- python                           2.7.17
+ python3                                      3.7.5
+ xz                                           5.2.4
