# Installing ReinforcementLearning.jl downgrades Flux.jl
**URL:** https://discourse.julialang.org/t/installing-reinforcementlearning-jl-downgrades-flux-jl/97880
**Category:** Package Management
**Tags:** package
**Created:** [April 24, 2023, 8:55pm UTC](https://discourse.julialang.org/t/installing-reinforcementlearning-jl-downgrades-flux-jl/97880 "2023-04-24T20:55:00Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@karim](https://discourse.julialang.org/u/karim)
#### Post date: [April 24, 2023, 8:55pm UTC](https://discourse.julialang.org/t/installing-reinforcementlearning-jl-downgrades-flux-jl/97880/1 "2023-04-24T20:55:00Z")
HI,
I’m trying to install both Flux.jl and ReinforcementLearning.jl, but I noticed that when I first install Flux.jl I get v0.13.15 but once I add ReinforcementLearning.jl (v0.10.2) Flux.jl gets downgraded to v0.13.4. Is there any way around this? I’m just starting to learn how to use these packages, so I would really like to get the latest package versions mostly to be able to follow the documentation.
If try to add Flux@0.13.15 I get the following
```julia
(grokking-drl) pkg> add Flux@0.13.15
Updating registry at `~/.julia/registries/JuliaPOMDP`
Updating git-repo `https://github.com/JuliaPOMDP/Registry`
Updating registry at `~/.julia/registries/General.toml`
Resolving package versions...
ERROR: Unsatisfiable requirements detected for package CUDA [052768ef]:
CUDA [052768ef] log:
├─possible versions are: 0.1.0-4.1.4 or uninstalled
├─restricted to versions * by an explicit requirement, leaving only versions 0.1.0-4.1.4
├─restricted by compatibility requirements with Flux [587475ba] to versions: 3.0.0-4.1.4
│ └─Flux [587475ba] log:
│ ├─possible versions are: 0.4.1-0.13.15 or uninstalled
│ └─restricted to versions 0.13.15 by an explicit requirement, leaving only versions 0.13.15
├─restricted by compatibility requirements with LLVM [929cbde3] to versions: 3.3.3-4.1.4 or uninstalled, leaving only versions: 3.3.3-4.1.4
│ └─LLVM [929cbde3] log:
│ ├─possible versions are: 0.9.0-5.0.0 or uninstalled
│ ├─restricted to versions * by an explicit requirement, leaving only versions 0.9.0-5.0.0
│ ├─restricted by compatibility requirements with CUDA [052768ef] to versions: 3.0.0-5.0.0
│ │ └─CUDA [052768ef] log: see above
│ └─restricted by julia compatibility requirements to versions: 4.0.0-5.0.0 or uninstalled, leaving only versions: 4.0.0-5.0.0
├─restricted by compatibility requirements with ReinforcementLearningZoo [d607f57d] to versions: 3.0.0-3.13.1, leaving only versions: 3.3.3-3.13.1
│ └─ReinforcementLearningZoo [d607f57d] log:
│ ├─possible versions are: 0.1.0-0.6.0 or uninstalled
│ ├─restricted by compatibility requirements with Flux [587475ba] to versions: 0.5.12-0.6.0 or uninstalled
│ │ └─Flux [587475ba] log: see above
│ └─restricted by compatibility requirements with ReinforcementLearning [158674fc] to versions: [0.1.0-0.1.7, 0.2.1-0.5.12], leaving only versions: 0.5.12
│ └─ReinforcementLearning [158674fc] log:
│ ├─possible versions are: 0.2.0-0.10.2 or uninstalled
│ ├─restricted to versions * by an explicit requirement, leaving only versions 0.2.0-0.10.2
│ ├─restricted by compatibility requirements with Flux [587475ba] to versions: 0.4.0-0.10.2 or uninstalled, leaving only versions: 0.4.0-0.10.2
│ │ └─Flux [587475ba] log: see above
│ └─restricted by compatibility requirements with ReinforcementLearningZoo [d607f57d] to versions: [0.2.0-0.3.0, 0.10.0-0.10.2] or uninstalled, leaving only versions: 0.10.0-0.10.2
│ └─ReinforcementLearningZoo [d607f57d] log: see above
├─restricted by compatibility requirements with NNlibCUDA [a00861dc] to versions: 3.11.0-4.1.4, leaving only versions: 3.11.0-3.13.1
│ └─NNlibCUDA [a00861dc] log:
│ ├─possible versions are: 0.1.0-0.2.7 or uninstalled
│ └─restricted by compatibility requirements with Flux [587475ba] to versions: 0.2.6-0.2.7
│ └─Flux [587475ba] log: see above
└─restricted by compatibility requirements with cuDNN [02a925ec] to versions: 4.0.0-4.1.4 — no versions left
└─cuDNN [02a925ec] log:
├─possible versions are: 1.0.0-1.0.2 or uninstalled
```
Thank you!
Karim
---
### Author:  [@mrufsvold](https://discourse.julialang.org/u/mrufsvold)
#### Post date: [April 25, 2023, 12:55am UTC](https://discourse.julialang.org/t/installing-reinforcementlearning-jl-downgrades-flux-jl/97880/2 "2023-04-25T00:55:41Z")
Intercomparability of packages in your environment is required.
However, it looks like the core problem here may be solvable by the maintainers? It appears that [ReinforcementLearningZoo](https://github.com/JuliaReinforcementLearning/ReinforcementLearningZoo.jl) is holding back CUDA which messes with all the other packages. The repo says it’s been archived since 2021, so it might be possible for ReinforcementLearning.jl to drop it as a dependency.
If there isn’t one already, it would be worth filing an issue with them.
Edit: looking a little deeper, [per this issue](https://github.com/JuliaReinforcementLearning/ReinforcementLearning.jl/issues/860) they are in the midst of a refactor so getting versions lined up might be a low priority, but I don’t see an issue open about this, so no harm opening one!
---
### Author:  [@karim](https://discourse.julialang.org/u/karim)
#### Post date: [April 25, 2023, 9:53pm UTC](https://discourse.julialang.org/t/installing-reinforcementlearning-jl-downgrades-flux-jl/97880/3 "2023-04-25T21:53:55Z")
Thank you, for digging into this issue. I will go ahead an file a bug. In the meantime, I’ve decided to use PyCall and use the environment I want from the Python gym package.