# Optimization code

**URL:** <https://discourse.julialang.org/t/optimization-code/58744>\
**Category:** General Usage\
**Tags:** question\
**Created:** [April 7, 2021, 10:39am UTC](https://discourse.julialang.org/t/optimization-code/58744 "2021-04-07T10:39:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dires](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@dires](https://discourse.julialang.org/u/dires)\
**Post date:** [April 7, 2021, 10:39am UTC](https://discourse.julialang.org/t/optimization-code/58744/1 "2021-04-07T10:39:19Z")

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I have got a warning message below,

┌ Warning: `with_optimizer` is deprecated. Adapt the following example to update your code:  
│ `with_optimizer(Ipopt.Optimizer)` becomes `Ipopt.Optimizer`.  
│ caller = top-level scope at ETMODEL 10.jl:155  
└  
I don’t understand what to update.

---

<div class="post-metadata">

**Author:** ![hendri54](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/hendri54/32/9621_2.png) [@hendri54](https://discourse.julialang.org/u/hendri54)\
**Post date:** [April 7, 2021, 12:10pm UTC](https://discourse.julialang.org/t/optimization-code/58744/2 "2021-04-07T12:10:45Z")

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You are probably looking at (with instructions):

> <https://github.com/jump-dev/JuMP.jl/blob/master/NEWS.md#version-021-feb-16-2020>