Unable to update packages

I am unable to update packages. I am trying to find out if the problem is with Julia or some internet routing problem. Can anyone help?

$ julia -O3
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _  |  |
  | | |_| | | | (_| |  |  Version 1.6.3 (2021-09-23)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.6) pkg> up
    Updating registry at `~/.julia/registries/General`
┌ Warning: could not download https://pkg.julialang.org/registries
└ @ Pkg.Types /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Pkg/src/Types.jl:997
  No Changes to `~/.julia/environments/v1.6/Project.toml`
  No Changes to `~/.julia/environments/v1.6/Manifest.toml`

julia> import Downloads

julia> Downloads.download("https://pkg.julialang.org/registries",stdout)
ERROR: HTTP/1.1 301 Australian region -> AU internal redirect trigger (SSL certificate problem: Invalid certificate chain) while requesting https://pkg.julialang.org/registries
Stacktrace:
  [1] (::Downloads.var"#9#18"{Base.TTY, Base.DevNull, Nothing, Vector{Pair{String, String}}, Float64, Nothing, Bool, Bool, String, Int64, Bool, Bool})(easy::Downloads.Curl.Easy)
    @ Downloads /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.6/Downloads/src/Downloads.jl:369
  [2] with_handle(f::Downloads.var"#9#18"{Base.TTY, Base.DevNull, Nothing, Vector{Pair{String, String}}, Float64, Nothing, Bool, Bool, String, Int64, Bool, Bool}, handle::Downloads.Curl.Easy)