# Problem with 1.20.1
**URL:** https://forum.syncthing.net/t/problem-with-1-20-1/18414
**Category:** Support
**Created:** [May 10, 2022, 1:16am UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414 "2022-05-10T01:16:23Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@mwolczko](https://forum.syncthing.net/u/mwolczko)
#### Post date: [May 10, 2022, 1:16am UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/1 "2022-05-10T01:16:23Z")
I’ve been doing daily syncs of a few files between 2 Macs for a few years. A few days ago it stopped working; one end would not run. Reverting from 1.20.1 to 1.19.2-1 fixed the problem. The machine is a Mac mini (mid 2011) running Sierra (10.12.6). Maybe it’s too old to be supported? But, I got no warnings when I last updated (unless they were in a doc I didn’t read).
The other end is a MBP running Catalina and is still fine on 1.20.1.
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 10, 2022, 5:19am UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/2 "2022-05-10T05:19:08Z")
Syncthing’s old-OS compatibility is mostly determined by the Go compiler & runtime we use. The previous version required 10.13 (High Sierra), now the requirement is 11 (Big Sur). Things sometimes work even on older versions, if we don’t tickle the specific thing that bumped the requirement.
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### Author:  [@mwolczko](https://forum.syncthing.net/u/mwolczko)
#### Post date: [May 10, 2022, 6:50pm UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/3 "2022-05-10T18:50:33Z")
Thanks for the explanation!
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### Author:  [@Arunas](https://forum.syncthing.net/u/Arunas)
#### Post date: [May 11, 2022, 7:07am UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/4 "2022-05-11T07:07:21Z")
Thats a pity, Big Sur dropped support of very capable machines, which work perfectly on Catalina. IMHO Catalina should be the lower limit for few years still.
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### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 11, 2022, 2:28pm UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/5 "2022-05-11T14:28:54Z")
Luckily, you can still use very capable versions of Syncthing on those machines or, if you care enough, build even the latest version of Syncthing using an older Go compiler.
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### Author:  [@system](https://forum.syncthing.net/u/system)
#### Post date: [June 10, 2022, 2:29pm UTC](https://forum.syncthing.net/t/problem-with-1-20-1/18414/6 "2022-06-10T14:29:24Z")
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