# Problem with optimisation code

**URL:** <https://discourse.julialang.org/t/problem-with-optimisation-code/27936>\
**Category:** General Usage\
**Tags:** question\
**Created:** [August 24, 2019, 2:52pm UTC](https://discourse.julialang.org/t/problem-with-optimisation-code/27936 "2019-08-24T14:52:45Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [August 24, 2019, 3:18pm UTC](https://discourse.julialang.org/t/problem-with-optimisation-code/27936/4 "2019-08-24T15:18:57Z")

</div>

Please see [JuMP v0.19.2 ⇒ v0.18.6 - #3 by odow](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917/3).

This is an unfortunate result of `Pkg` choosing to downgrade JuMP in order to update GLPK. Run

```nohighlight
rm GLPK
up JuMP@0.19
add GLPK@0.10

```

It will be fixed by an upcoming release of JuMP.

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_[View the full topic](https://discourse.julialang.org/t/problem-with-optimisation-code/27936)._