# Watch out! 1.6 can mess up your environment
**URL:** https://discourse.julialang.org/t/watch-out-1-6-can-mess-up-your-environment/52019
**Category:** General Usage
**Created:** [December 18, 2020, 2:29am UTC](https://discourse.julialang.org/t/watch-out-1-6-can-mess-up-your-environment/52019 "2020-12-18T02:29:20Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [December 18, 2020, 2:29am UTC](https://discourse.julialang.org/t/watch-out-1-6-can-mess-up-your-environment/52019/1 "2020-12-18T02:29:20Z")
If you are like me and you like to try things out, you might be tempted to test your packages with 1.6. If you then commit your environment files, you might not be able to go back to 1.5 without some work. Some of the packages that end up in your environment will not run with Pkg used with 1.5.
---
### Author:  [@mbauman](https://discourse.julialang.org/u/mbauman)
#### Post date: [December 18, 2020, 3:38am UTC](https://discourse.julialang.org/t/watch-out-1-6-can-mess-up-your-environment/52019/2 "2020-12-18T03:38:37Z")
I believe it’s just the `Manifest.toml`s created by 1.6 that are not backwards compatible. The packages themselves (by default) should be installed separately.
[https://github.com/JuliaLang/Pkg.jl/issues/2289](https://github.com/JuliaLang/Pkg.jl/issues/2289)
---
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [December 18, 2020, 3:48am UTC](https://discourse.julialang.org/t/watch-out-1-6-can-mess-up-your-environment/52019/3 "2020-12-18T03:48:02Z")
Yes, that is what I meant. The installation of the said packages would be broken.