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.