JuMP 0.23 is released

We are happy to announce the release of JuMP v0.23.

This is an important release for two reasons.

First, it serves as a release candidate for JuMP v1.0. Our criteria for tagging an official JuMP 1.0 release are:

• there have been no bugs requiring a breaking change detected in JuMP v0.23 for at least one week
• all commonly used solvers in the JuMP ecosystem have been updated to be compatible with JuMP v0.23. You can track our progress in Issue #2564.

Second, this release contains a number of breaking changes in preparation for JuMP v1.0. These include:

• Julia 1.6 is now the minimum supported version
• All previously deprecated functionality has been removed. See the troubleshooting section below for advice on how to update code that uses previously deprecated functionality.
• PrintMode, REPLMode and IJuliaMode have been removed in favor of the MIME types MIME"text/plain" and MIME"text/latex". Replace instances of ::Type{REPLMode} with ::MIME"text/plain", REPLMode with MIME("text/plain"), ::Type{IJuliaMode} with ::MIME"text/latex", and IJuliaMode with MIME("text/latex").
• Functions containing the nl_ acronym have been renamed to the more explicit nonlinear_. For example, num_nl_constraints is now num_nonlinear_constraints and set_NL_objective is now set_nonlinear_objective. Calls to the old functions throw an error explaining the new name.
• SymMatrixSpace has been renamed to SymmetricMatrixSpace

Troubleshooting problems when updating

If you experience problems when updating, you are likely using previously deprecated functionality. (By default, Julia does not warn when you use deprecated features.)

To find the deprecated features you are using, start Julia with --depwarn=yes:

$ julia --depwarn=yes

Then install JuMP v0.22.3:

julia> using Pkg
julia> pkg"add JuMP@0.22.3"

And then run your code. Apply any suggestions, or search the release notes for advice on updating a specific deprecated feature.

Onward to JuMP 1.0!

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