When was UniFi OS (Dream Machines) 5.1.31 released?

UniFi OS (Dream Machines) 5.1.31 was released on 2026-08-20.

Is there a newer UniFi OS (Dream Machines) release than 5.1.31?

Yes. The latest stable UniFi OS (Dream Machines) release is 5.1.33 (2026-09-09).

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UniFi OS (Dream Machines) 5.1.31 – safe to update?

Q: Is UniFi OS (Dream Machines) 5.1.31 safe to update to?

No problems reported. 0 problem reports and 0 positive reports found on Reddit (plus 7 other mentions). Out for 58 days and we haven't found any problem reports. Quiet isn't proof — but most bad releases get noticed within a week.

No problems reported

0 problem reports and 0 positive reports found on Reddit (plus 7 other mentions). Out for 58 days and we haven't found any problem reports. Quiet isn't proof — but most bad releases get noticed within a week.

Newer release in this line: UniFi OS (Dream Machines) 5.1.33 (2026-09-09). If you're updating now, check that one instead — it may already fix the issues reported here.

Security update: this release fixes security issues. Waiting carries its own risk — if your device is exposed, weigh that against the reports below.

2026-08-20released

58days ago

0problem reports

0fine reports

0CVEs mapped

Did you install 5.1.31?

What's in this release

Overview UniFi OS 5.1.31 includes the improvements and bugfixes below. Bundled • UniFi Network 10.5.67 • Identity Sync Service 1.8.4 Improvements • Improved Shadow Mode resiliency. • Improved device stability. Bugfixes • Fixed the security issues mentioned in Security Advisory Bulletin 067 . • Fixed the security issue…

Official release notes →

Source: community.ui.com RSS

CVEs fixed

No CVEs mapped to this release, though the vendor flags it as a security update.

Community reports

Mention UniFi Security Advisory - 6 High-Severity DoS Vulnerabilities Affect Dream Machines, Cloud Gateways, Dream Routers, Dream Wall, Express & UniFi Gateways - CVSS 7.5 - Update Now · Reddit · 2026-09-22
https://community.ui.com/releases/Security-Advisory-Bulletin-069-069/07e367a7-edec-4d85-a058-f97e5ce9ac9c Update your Dream Machines, Enterprise Firewalls, Dream Routers, Cloud Gateways, and Dream Wall to Version 5.1.31 or later. Update your Express to Version 4.0.21 or later. U…
Mention UniFi Security Advisory - 6 High-Severity DoS Vulnerabilities Affect Dream Machines, Cloud Gateways, Dream Routers, Dream Wall, Express & UniFi Gateways - CVSS 7.5 - Update Now · Reddit · 2026-09-22
https://community.ui.com/releases/Security-Advisory-Bulletin-069-069/07e367a7-edec-4d85-a058-f97e5ce9ac9c Update your Dream Machines, Enterprise Firewalls, Dream Routers, Cloud Gateways, and Dream Wall to Version 5.1.31 or later. Update your Express to Version 4.0.21 or later. U…
Mention Does Region blocking work with firewall rules?? · Reddit · 2026-09-15
I've got a Dream Machine Pro Max ver. 5.1.31 and trying to create some firewall rules to only allow USA and block everything else and it still blocks USA.
Mention It finally happened to me, an update that I didn't request · Reddit · 2026-09-12
I updated my UDM Pro Unifi OS from 5.1.31 to 5.1.33 and Network 10.6.106 came along for the ride. So much for honoring my release channel and auto update settings. After the update, they are still set to Official and Off, not that they appear to mean anything.
Mention UCF-Fiber - update 5.1.31 -> 5.1.33 failed. router is not responsive ;/ · Reddit · 2026-09-10
Struggling with my UCG-fiber right now, I noticed an update for the UCG-fiber (official channel) appeared under control plane to update to the latest version ~1hr ago. I clicked it, followed by an update screen take will 5min or so and reboot. Fast forward about an hour, its sti…
Mention Admin Creation / Permission Change logs... Broken? · Reddit · 2026-09-08
Hi all, Just wanted to bounce this question off of the Reddit hivemind before I go too far down into the weeds on this. Today while troubleshooting one of my consoles, I noticed the Audit logs aren't showing changes to Admin Permissions (such as adding or removing application ri…
Mention UDM Pro Access installation fails due to Debian EOL on Aug 31, 2026 · Reddit · 2026-09-07
As per title, UniFi Access fails to install because the UDM Pro UniFi OS 5.1.31 is trying to download required packages from Debian 11s expired repository. Debian 11 reached end-of-life on August 31, 2026 the repository metadata and package links are no longer valid, causing APT…
Mention First time trying to use Ethernet from my Dream Machine failed twice · Reddit · 2026-09-06
I installed a Dream Machine SE and APs, along with Cat6 cabling and, etc. a few months ago. The WiFi has been working great, including for my PC and TV. I went to try and switch these over to Ethernet to see if everything was working, and neither of those devices recognized the…

Reports are found automatically and labelled by an AI model plus keyword rules — they can be wrong. Open the post to judge for yourself.

Other UniFi OS (Dream Machines) versions

5.1.33 2026-09-09
5.1.31 2026-08-20
5.1.30 Release candidate / early access 2026-08-17
5.1.27 Release candidate / early access 2026-08-04
5.1.26 2026-07-22
5.1.19 2026-06-17
5.1.15 2026-06-01
5.1.12 2026-05-21