One UI 9 Is the Last Major Update for Galaxy S23, Z Fold 5

If you own a 2023 Samsung Galaxy phone, the update you just received — or are about to receive — is the last big one. One UI 9, Samsung’s software based on Android 17, is the final major upgrade for the Galaxy S23 series, the Galaxy Z Fold 5, the Galaxy Z Flip 5 and several 2023 mid-range models, according to reports published on November 14, 2026.

The phones will keep working, and security patches will keep arriving for a while yet. But there will be no Android 18 on these devices — and the next big Samsung software release is expected to pass them by.

Which Galaxy phones stop at One UI 9

The models for which One UI 9 is the last major update are:

Galaxy S23, Galaxy S23+ and Galaxy S23 Ultra
Galaxy S23 FE
Galaxy Z Fold 5 and Galaxy Z Flip 5
Galaxy A54, Galaxy A34 and Galaxy M54
Galaxy Tab S9 series (also reported)

That is the full list reported so far. If your phone is not on it, it is not affected by this cut-off.

Why One UI 9 is the end of the road

The Galaxy S23 series launched in February 2023 with Android 13 and One UI 5.1. Under the software policy Samsung announced in early 2022, these phones were promised up to four generations of Android upgrades — and One UI 9, based on Android 17, is the fourth, after Android 14, 15 and 16.

The cut-off was reportedly confirmed by Samsung itself. A Samsung support representative reportedly told a customer in August 2026 that One UI 9 is the final major OS upgrade for the Galaxy S23 series, in an exchange shared by tipster Tarun Vats and reported by SamMobile. The message was blunt: “Initially, updates up to Android 18 were planned, but now the last one is Android 17.”

That is a reported support-chat confirmation, not a formal Samsung announcement — but it matches the four-upgrade promise exactly, and the rollout has now reached these phones, so the picture is consistent.

Security patches continue into 2028

The end of major updates is not the end of support. The same 2022 policy promised up to five years of security updates, and the S23 series, Z Fold 5, Z Flip 5, A54, A34 and M54 are all still scheduled for monthly patches. TechRadar lists 2028 as the final year the S23 series will receive security patches, in line with five years from its 2023 launch.

The October 2026 security update bundled with the stable S23 One UI 9 build fixed 79 vulnerabilities, according to Engadget — a reminder that these monthly patches still matter, especially for banking apps and work email.

When One UI 9 arrived

One UI 9 began reaching the Galaxy S23, S23+ and S23 Ultra in South Korea on October 14, 2026, arriving in Europe a few days later. The Galaxy Z Fold 5 and Z Flip 5 picked it up in the United States on October 23. The global rollout for the S23 series then expanded to more countries, with the October 2026 security patch included.

The contrast with newer phones is stark. Samsung brought One UI 9 to the Galaxy S26 in September 2026, and that phone is supported until 2033 under Samsung’s newer seven-year policy — a policy the 2023 models missed.

What this means for owners

If you own one of the affected phones, the advice is simple: install One UI 9, keep installing the monthly security patches, and plan your next upgrade for 2028 at the latest — that is when the patches are expected to stop.

One UI 9.5, Samsung’s next software release, is expected to arrive with the Galaxy S27 series in early 2027, built on Android 17 QPR2. Reports suggest these 2023 models are very unlikely to get it. For now, though, a Galaxy S23 running One UI 9 with monthly patches remains a fully usable phone — it has simply reached the end of its feature road.

For a closer look at the phone at the centre of this story, see our Samsung Galaxy S23 Ultra review. Samsung’s next flagship line is also taking shape — see our report on the Galaxy S27 leaks.

Source: Engadget