Apple today pushed out the watchOS 26.4 developer preview Beta 3 update (build number: 23T5226e) to Apple Watch users. This update comes 7 days after the last Beta/RC release.
How do I upgrade to the iOS/iPadOS/watchOS/macOS developer and public beta versions?
• Public beta: Requires registration for the Apple Beta Software Program, then upgrade via Settings > General > Software Update > Beta Update;
• Developer Preview: You need to log in and register for the Apple Developer Program, and then upgrade through Settings > General > Software Update.
Here is a complete list of Apple iOS historical firmware downloads:
Apple iOS / iPadOS / macOS Firmware Downloads / Update Logs (Complete List )
watchOS 26.4 adds a new “average bedtime” metric to the sleep feature that syncs with the Health app, so you can better monitor the impact of bedtime on overall sleep quality.
Appendix: watchOS 26 release history:
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2026-02-24: watchOS 26.4 Beta 2 (23T5221e)
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2026-02-17: watchOS 26.4 Beta (23T5209m)
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2026-02-12: watchOS 26.3 (23S620)
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2026-02-05: watchOS 26.3 RC (23S618)
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2026-01-27: watchOS 26.2.1 (23S314)
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2026-01-27: watchOS 26.3 Beta 3 (23S5611c)
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2026-01-13: watchOS 26.3 Beta 2 (23S5600d)
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2025-12-16: watchOS 26.3 Beta (23S5586d)
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2025-12-13: watchOS 26.2 (23S303)
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2025-12-04: watchOS 26.2 RC (23S303)
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2025-11-18: watchOS 26.2 Beta 3 (23S5297b)
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2025-11-13: watchOS 26.2 Beta 2 (23S5286d)
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2025-11-05: watchOS 26.2 Beta (23S5280e)
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2025-11-04: watchOS 26.1 (23S37)
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2025-10-29: watchOS 26.1 RC (23S36)
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2025-10-21: watchOS 26.1 Beta 4 (23S5031a)
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2025-10-14: watchOS 26.1 Beta 3 (23S5022e)
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2025-10-07: watchOS 26.1 Beta 2 (23S5017d)
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2025-09-30: watchOS 26.0.1 (23R8362)
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2025-09-23: watchOS 26.1 Beta (23S5002i)
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2025-09-10: watchOS 26 RC (23R351)
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2025-09-03: watchOS 26 Beta 9 (23R5350b)
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2025-08-26: watchOS 26 Beta 8 (23R5350a)
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2025-08-19: watchOS 26 Beta 7 (23R5346a)
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2025-08-12: watchOS 26 Beta 6 (23R5340a)
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2025-08-06: watchOS 26 Beta 5 (23R5328g)
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2025-07-23: watchOS 26 Beta 4 (23R5317g)
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2025-07-08: watchOS 26 Beta 3 (23R5307g)
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2025-06-24: watchOS 26 Beta 2 (23R5296f)
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2025-06-10: watchOS 26 Beta (23R5280m)
