# JuMP v0.19.2 ⇒ v0.18.6

**URL:** <https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917>\
**Category:** Optimization (Mathematical)\
**Created:** [August 24, 2019, 12:39am UTC](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917 "2019-08-24T00:39:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![raktim](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raktim/32/11188_2.png) [@raktim](https://discourse.julialang.org/u/raktim)\
**Post date:** [August 24, 2019, 12:39am UTC](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917/1 "2019-08-24T00:39:56Z")

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Just installed Julia 1.2 along with JuMP and other packages. Did an update and noticed that JuMP was downgraded from version v0.19.2 ⇒ v0.18.6. Not sure why this is happening. Any clues?

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**Author:** ![evanfields](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/evanfields/32/1744_2.png) [@evanfields](https://discourse.julialang.org/u/evanfields)\
**Post date:** [August 24, 2019, 1:15am UTC](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917/2 "2019-08-24T01:15:07Z")

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I would guess it has something to do with this [issue](https://github.com/JuliaLang/julia/issues/32167#issuecomment-523645974). Seems like under 1.2, compiling MOI code (and by extension JuMP) can hang. I’m super not an expert, perhaps one of the JuMP or MOI devs can illuminate the situation.

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**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, 1:36am UTC](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917/3 "2019-08-24T01:36:47Z")

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This is a unfortunate result of Pkg choosing to downgrade JuMP instead of one of the solvers you have installed.

See [https://github.com/JuliaOpt/GLPK.jl/issues/106#issuecomment-523659797](https://github.com/JuliaOpt/GLPK.jl/issues/106#issuecomment-523659797)

However. If you use Julia 1.2 at present, you will encounter the compiler hang mentioned above. The new version of JuMP will fix this, but until it’s released, we recommend you stick with Julia 1.1.

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**Author:** ![raktim](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raktim/32/11188_2.png) [@raktim](https://discourse.julialang.org/u/raktim)\
**Post date:** [August 26, 2019, 1:57pm UTC](https://discourse.julialang.org/t/jump-v0-19-2-v0-18-6/27917/4 "2019-08-26T13:57:09Z")

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Thanks! Today when I updated the packages, JuMP got upgraded to 0.20.