# Creating an environment to use specific versions of packages, Julia uses most current anyway

**URL:** <https://discourse.julialang.org/t/creating-an-environment-to-use-specific-versions-of-packages-julia-uses-most-current-anyway/38021>\
**Category:** General Usage\
**Created:** [April 22, 2020, 11:22am UTC](https://discourse.julialang.org/t/creating-an-environment-to-use-specific-versions-of-packages-julia-uses-most-current-anyway/38021 "2020-04-22T11:22:47Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**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 22, 2020, 4:21pm UTC](https://discourse.julialang.org/t/creating-an-environment-to-use-specific-versions-of-packages-julia-uses-most-current-anyway/38021/3 "2020-04-22T16:21:15Z")

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You may be running into stacked environments:

[https://docs.julialang.org/en/v1/manual/code-loading/#Environment-stacks-1](https://docs.julialang.org/en/v1/manual/code-loading/#Environment-stacks-1)

> [@Shared environments](https://discourse.julialang.org/t/shared-environments/35999):
>
> I recently [learned](https://discourse.julialang.org/t/why-start-domain-specific-scientific-projects-as-packages/34752/11) about “shared environments”, aka the default v1.3 environment. It’s quite a revelation, but I don’t understand how it works. Suppose I have Package A which depends on B@v1.0.0, and is compatible with no other version of B. A is in the shared environment’s Project.toml. Environment E, which has package C in its Project.toml. C depends on B@v2.0.0 (compatible with no other version). When I am in E and I using A, which version of B is loaded?

If you previously activated an environment that (even indirectly) loaded the newer version of JuMP, the Manifest entry no longer matters.

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_[View the full topic](https://discourse.julialang.org/t/creating-an-environment-to-use-specific-versions-of-packages-julia-uses-most-current-anyway/38021)._