I cannot update to the latest Mux.jl

General Usage
1

I don’t know exactly why this happens.

(v1.0) pkg> st
    Status `~/.julia/environments/v1.0/Project.toml`
  ···
  [a975b10e] Mux v0.4.0

(v1.0) pkg> up
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
  Updating `~/.julia/environments/v1.0/Project.toml`
 [no changes]
  Updating `~/.julia/environments/v1.0/Manifest.toml`
 [no changes]

I see that the latest release of Mux.jl is v0.5.0. Thanks for the help.

2

The new Mux version has not been registered yet: https://github.com/JuliaLang/METADATA.jl/tree/metadata-v2/Mux.

You can do add Mux#master to get the master version.