Summary
- One UI 9 (Android 17) is the final major update for the Galaxy S23 series, the Z Fold 5, the Z Flip 5 and several 2023 mid-range Galaxy phones.
- The update has already reached the Galaxy S23 series in South Korea and Europe, and the Z Fold 5 and Z Flip 5 in the United States.
- Security patches will keep coming until 2028, so these phones are not about to stop working — but they will almost certainly never get Android 18 or One UI 9.5.
If you bought a Galaxy phone in 2023, the update now rolling out to your phone is the last big one it will ever get. One UI 9, Samsung’s version of Android 17, completes the four major upgrades Samsung promised at launch — and after it, the company is expected to move on to newer models.
A Samsung support representative reportedly confirmed 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. The message was blunt: “Initially, updates up to Android 18 were planned, but now the last one is Android 17.” Your phone will not stop working, and security patches will keep coming for years. What ends is the flow of new Android versions and new features. The Galaxy S23 FE is on the same list, but Samsung has not given it a One UI 9 release date yet.
The confirmation: four upgrades, then done
The Galaxy S23, S23+ and S23 Ultra launched in February 2023 running Android 13 with One UI 5.1. Under the software policy Samsung announced in early 2022, selected Galaxy devices were promised up to four generations of Android and One UI upgrades, plus up to five years of security updates. One UI 9 is the fourth: Android 14, then 15, then 16, and now 17. The promise is fulfilled, and Samsung’s policy draws the line there.
The support exchange shared by Tarun Vats concerned the Galaxy S23 FE, the cheaper Fan Edition model that arrived later in 2023. The representative’s reply said the FE’s last One UI update would be One UI 9, “like the Galaxy S23 Series”. The S23 FE also launched with Android 13, so it sits on the same four-upgrade clock. Samsung has not published a blog post declaring the end of major updates for these phones, but the support exchange, the update policy and recent rollouts all point the same way.
Every Galaxy phone stopping at One UI 9
The devices for which One UI 9 is the last major update:
- Galaxy S23, Galaxy S23+ and Galaxy S23 Ultra
- Galaxy S23 FE
- Galaxy Z Fold 5 and Galaxy Z Flip 5
- Galaxy A54 5G and Galaxy A34 5G
- Galaxy M54 5G
- Galaxy Tab S9, Tab S9+ and Tab S9 Ultra
Wider roundups put the total at 19 devices, adding the Galaxy A24 4G, M34 5G, F54 5G and F34 5G — all 2023 models under the same four-upgrade promise. If your phone is on this list, Android 17 is the end of the road for major upgrades.
Rollout so far: who has One UI 9 already
One UI 9 began reaching the Galaxy S23, S23+ and S23 Ultra in South Korea on October 14, 2026, and arrived in Europe a few days later. The Galaxy Z Fold 5 and Z Flip 5 picked up One UI 9 in the United States on October 23.
The Galaxy S23 FE is the exception: Samsung has not given it a One UI 9 release date, and it was not part of the first S23 wave. The mid-range models are following their own schedules, with the A54 and A34 receiving One UI 9 in more countries through October and November.
Why One UI 9 is the end: the QPR2 problem
There is a technical reason One UI 9.5 is unlikely to reach these phones. In previous years, Samsung’s mid-cycle updates — One UI 6.1, One UI 6.1.1 and the like — were built on exactly the same Android foundation as the major release before them, so porting them to older phones was straightforward.
One UI 8.5 broke that pattern: it is built on Android 16 QPR2, a quarterly platform release with extra platform changes, updated APIs and newer developer tools. It is different enough from the original Android 16 release that Samsung appears to treat it more like a new platform than a feature drop — part of why the Galaxy S22 never received One UI 8.5.
One UI 9.5 will almost certainly follow the same pattern, built on Android 17 QPR2 — due from Google in the fourth quarter of 2026 — and likely arriving in early to mid 2027 on the Galaxy S27 series. By then Samsung will have fulfilled the S23’s four-upgrade promise, putting it in the same position the S22 is in now.
Security patches continue into 2028
The end of major updates is not the end of support: Samsung’s 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 get a security patch. The October 2026 security update bundled with the stable S23 build fixed 79 vulnerabilities. The cadence may slow in the final year as devices leave the monthly list, and carrier-locked models may get patches quarterly rather than monthly.
That matters: patch deadlines are what keep banking apps and work email safe on your phone. A missing feature is an inconvenience; a missing security patch is a risk.
What is new for S23 owners in One UI 9
One UI 9 is still a substantial update, worth installing when it arrives. For S23 owners it brings a more customisable Quick Panel, improvements to Samsung DeX and Samsung Notes, new accessibility features and a location privacy indicator, plus support for One UI 9’s AI-powered Privacy Alerts.
There is a catch: several of the newest Galaxy AI tools skip these phones. SamMobile’s compatibility table shows none of the four AI features added in One UI 9 — My FanCam, Now Nudge, custom Now Brief cards and Call Brief — run on the S23 series or the S23 FE. Samsung’s Korean changelog for the S23 Ultra lists just one Galaxy AI item: scrollback for live Interpreter conversations. One caution before you update: after the One UI 8.5 rollout in May 2026, some S23 owners reported permanent green or pink lines on their displays, though there is no evidence One UI 9 causes it.
You are not required to install One UI 9, but since One UI is Samsung’s version of Android rather than an app, it cannot be removed. As the last major update these phones will get, installing it is the way to get the final features Samsung intends them to have.
What about the Galaxy S24 and newer?
Things are very different if you own a Galaxy S24 or later. At the S24’s launch in early 2024, Samsung promised seven generations of OS upgrades and seven years of security updates, covering the S24, S25 and S26 series — the S26 got One UI 9 in September 2026 and will be supported until 2033. The catch is that Samsung decided the seven-year promise would not apply retroactively to phones already on the market, like the S23.
For anyone buying a used Galaxy today, that gap is worth knowing: a used S23 is still capable, with security patches until 2028, but a used S24 costs more for a reason — it has years of major updates ahead.
The bottom line
One UI 9 is the last major update for the Galaxy S23 series, the Z Fold 5, the Z Flip 5, the Galaxy A54, A34 and M54, and the Galaxy Tab S9 series. The update is already rolling out, with the S23 FE still waiting for its date. Security patches will continue into 2028, so there is no rush to replace a phone that still does its job — but there will be no Android 18, and One UI 9.5 is very unlikely on these models. Install One UI 9 when it reaches you, keep installing the monthly patches, and plan on 2028 as the sensible moment to move on.
FAQs
Q1: Is One UI 9 the last major update for the Galaxy S23?
Yes. One UI 9 (Android 17) is the fourth and final major upgrade for the Galaxy S23, S23+ and S23 Ultra. The phones launched in 2023 with Android 13 under Samsung’s four-upgrade policy, and Android 14, 15, 16 and 17 have now used up all four. They will not get Android 18.
Q2: Which Galaxy phones stop at One UI 9?
The Galaxy S23, S23+, S23 Ultra and S23 FE, the Z Fold 5 and Z Flip 5, the A54 5G and A34 5G, the M54 5G, and the Tab S9 series. Wider roundups put the total at 19 devices, also adding the A24 4G, M34 5G, F54 5G and F34 5G.
Q3: Will the Galaxy S23 get One UI 9.5?
Almost certainly not. One UI 9.5 is expected to be built on Android 17 QPR2, and Samsung skipped the equivalent One UI 8.5 update for the Galaxy S22 for the same reason. One UI 9.5 is expected to debut on the Galaxy S27 in early 2027. Samsung has not ruled it out officially, but the precedent points against it.
Q4: How long will the Galaxy S23 keep getting security updates?
Until 2028. Samsung promised up to five years of security updates, and the S23 series remains on its monthly schedule. The October 2026 update bundled with the stable One UI 9 build fixed 79 vulnerabilities. The pace may slow in the final year, and carrier-locked models may get patches quarterly.
Q5: Should I upgrade my Galaxy S23 now that One UI 9 is its last update?
Not necessarily. The phone will keep working normally, and security patches run until 2028. Install One UI 9 when it arrives, keep installing the monthly patches, and treat 2028 as the sensible time to replace it. If you want years of new Android versions ahead, a Galaxy S24 or newer — covered by Samsung’s seven-year promise — is the safer buy.
Sources: Engadget, “One UI 9 Is The Final Major Update For These Older Samsung Galaxy Phones”, November 14, 2026. SamMobile, “Why One UI 9 could be last One UI update for Galaxy S23 series”, published June 15, 2026, updated November 3, 2026.
