# openHAB 4.0 Milestone discussion

**URL:** <https://community.openhab.org/t/openhab-4-0-milestone-discussion/145133>\
**Category:** News & Important Changes\
**Created:** [March 10, 2023, 11:01pm UTC](https://community.openhab.org/t/openhab-4-0-milestone-discussion/145133 "2023-03-10T23:01:43Z")\
**Posts on this page:** 1\
**Showing post:** 261

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**Author:** ![Andrew\_Rowe](https://community.openhab.org/user_avatar/community.openhab.org/andrew_rowe/32/37075_2.png) [@Andrew\_Rowe](https://community.openhab.org/u/Andrew_Rowe)\
**Post date:** [May 8, 2023, 10:19pm UTC](https://community.openhab.org/t/openhab-4-0-milestone-discussion/145133/261 "2023-05-08T22:19:11Z")

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> [@milo](#):
>
> steps for upgrading from oh3.4.4 to oh4.0m2

what is host operating system? Here is how I did my Linux host

> [@Upgrading OH3 to OH4 Linux Mint](https://community.openhab.org/t/upgrading-oh3-to-oh4-linux-mint/145156):
>
> I run openHAB on a small desktop PC running Linux Mint 19.2 This is an apt-get installed openHAB, this is NOT an openHABian install. This is not a headless system, I have a monitor, keyboard and mouse. Here is how I upgraded my install to the brand new M1 version WARNING: “Here be dragons”\* This worked for me but version 4 at this time is NOT officially released! Follow these instruction at your own peril!!! I am just documenting how I did it. First I checked which version of Java was runn…

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