# How to prevent version upgrade when adding package?
**URL:** https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464
**Category:** New to Julia
**Created:** [April 30, 2020, 4:42am UTC](https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464 "2020-04-30T04:42:40Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@jaynick](https://discourse.julialang.org/u/jaynick)
#### Post date: [April 30, 2020, 4:42am UTC](https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464/1 "2020-04-30T04:42:40Z")
In the particular scenario, Flux.jl depends on Zygote.jl,
so `Pkg.add("Flux")` also adds a version of Zygote behind the scene.
However, when it is necessary to access something in Zygote,
it is still necessary to explicitly Pkg.add(“Zygote”), even though a
version of Zygote is already loaded.
The question and issue: currently when doing this,
_it triggers a package upgrade_, **Zygote v0.4.13 → v0.4.17**
That is probably a good thing, however my program needs to be exactly reproducable, and so I want to be in control of when packages change versions.
How can I prevent `Pkg.add()` from changing the version of the added package.
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### Author:  [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)
#### Post date: [April 30, 2020, 5:05am UTC](https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464/2 "2020-04-30T05:05:51Z")
There are several answers to this. One answer is to add `Zygote` directly, which will tell the package manager not to mess with it (unless you tell it to). A perhaps more practical one is to trust semantic versioning to know that `v0.4.13` and `v0.4.17` should be compatible since they just differ by point releases.
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### Author:  [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [April 30, 2020, 6:32am UTC](https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464/3 "2020-04-30T06:32:11Z")
See [`Pkg.pin`](https://julialang.github.io/Pkg.jl/dev/api/#Pkg.pin).
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### Author:  [@jaynick](https://discourse.julialang.org/u/jaynick)
#### Post date: [April 30, 2020, 5:52pm UTC](https://discourse.julialang.org/t/how-to-prevent-version-upgrade-when-adding-package/38464/4 "2020-04-30T17:52:14Z")
Thank you I think both of these would work