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Windows 11 update history

Every Windows 11 update Microsoft has released in the last 12 months, newest first: the KB number, the build it installs, what kind of update it is, and whether Microsoft lists known issues for it.

Latest: KB5127646 (security update), released Oct 13, 2026, build 28000.3231.

Source: Microsoft's Windows 11 update history, checked every few hours. Open problems are listed on Windows known issues right now.

Update types

Security update: the monthly update released on the second Tuesday. It installs automatically.

Optional preview: next month's fixes, early. It only installs if you choose it in Windows Update.

Out-of-band: an emergency update released outside the normal schedule to fix a serious problem.

October 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Oct 13, 2026KB5127646Windows 11 26H128000.3231Security updateNone listed
Oct 13, 2026KB5127648Windows 11 24H2, 25H2, 26H226300.9711, 26200.9711, 26100.9711Security updateNone listed
Oct 13, 2026KB5126653Windows 11 23H222621.7652Security updateNone listedWhat's new in KB5126653 (Windows 11 build 22621.7652)

September 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Sep 22, 2026KB5124006Windows 11 26H128000.3086Optional preview1 open
Sep 22, 2026KB5124010Windows 11 24H2, 25H226300.9550, 26200.9550, 26100.9550Optional preview2 open, 2 resolvedKB5124010 not installing or stuck in Windows 11
Sep 14, 2026KB5129194Windows 11 26H128000.2956Out-of-bandNone listed
Sep 14, 2026KB5129195Windows 11 24H2, 25H226200.9457, 26100.9457Out-of-bandNone listed
Sep 14, 2026KB5129242Windows 11 23H222631.7584Out-of-bandNone listed
Sep 8, 2026KB5124012Windows 11 26H128000.2954Security update1 open, 3 resolved
Sep 8, 2026KB5124008Windows 11 24H2, 25H226200.9445, 26100.9445Security update2 open, 6 resolved
Sep 8, 2026KB5122880Windows 11 22H2, 23H222621.7582Security updateNone listed

August 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Aug 27, 2026KB5120996Windows 11 26H128000.2804Optional previewResolved
Aug 27, 2026KB5120998Windows 11 24H2, 25H226200.9278, 26100.9278Optional previewResolved
Aug 11, 2026KB5121000Windows 11 26H128000.2704Security updateResolved
Aug 11, 2026KB5121003Windows 11 24H2, 25H226200.9168, 26100.9168Security updateResolved
Aug 11, 2026KB5120240Windows 11 23H222631.7517Security updateNone listed

July 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Jul 28, 2026KB5101681Windows 11 26H128000.2608Optional previewNone listed
Jul 28, 2026KB510168426200.8973, 26100.8973Optional previewNone listed
Jul 18, 2026KB512176726200.8894, 26100.8894Out-of-bandNone listed
Jul 14, 2026KB5101649Windows 11 26H128000.2525Security updateNone listed
Jul 14, 2026KB510165026200.8875, 26100.8875Security updateNone listed
Jul 14, 2026KB5099414Windows 11 23H222631.7376Security updateNone listed

June 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Jun 23, 2026KB5095091Windows 11 26H128000.2340Optional previewNone listed
Jun 23, 2026KB509509326200.8737, 26100.8737Optional previewNone listed
Jun 9, 2026KB5095051Windows 11 26H128000.2269Security updateNone listed
Jun 9, 2026KB509412626200.8655, 26100.8655Security updateNone listed
Jun 9, 2026KB5093998Windows 11 23H222631.7219Security updateNone listed

May 2026

ReleasedUpdateBuildTypeKnown issues · our guide
May 26, 2026KB5089570Windows 11 26H128000.2179Optional previewNone listed
May 26, 2026KB508957326200.8524, 26100.8524Optional previewNone listed
May 12, 2026KB5089548Windows 11 26H128000.2113Security updateNone listed
May 12, 2026KB508954926200.8457, 26100.8457Security updateNone listed
May 12, 2026KB5087420Windows 11 23H222631.7079Security updateNone listed

April 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Apr 30, 2026KB5083806Windows 11 26H128000.1896Optional previewNone listed
Apr 30, 2026KB508363126200.8328, 26100.8328Optional previewNone listedWhat's new in KB5083631 (Windows 11 build 26200.8328)
Apr 14, 2026KB5083768Windows 11 26H128000.1836Security updateNone listed
Apr 14, 2026KB508376926200.8246, 26100.8246Security updateNone listed
Apr 14, 2026KB5082052Windows 11 23H222631.6936Security updateNone listed

March 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Mar 31, 2026KB508667226200.8117, 26100.8117Out-of-bandNone listed
Mar 26, 2026KB5079489Windows 11 26H128000.1764Optional previewNone listed
Mar 26, 2026KB507939126200.8116, 26100.8116Optional previewNone listed
Mar 21, 2026KB508551626200.8039, 26100.8039Out-of-bandNone listed
Mar 10, 2026KB5079466Windows 11 26H128000.1719Security updateNone listed
Mar 10, 2026KB507947326200.8037, 26100.8037Security updateNone listed
Mar 10, 2026KB5078883Windows 11 23H222631.6783Security updateNone listed

February 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Feb 24, 2026KB5077239Windows 11 26H128000.1643Optional previewNone listed
Feb 24, 2026KB507724126200.7922, 26100.7922Optional previewNone listed
Feb 10, 2026KB5077179Windows 11 26H128000.1575Security updateNone listed
Feb 10, 2026KB507718126200.7840, 26100.7840Security updateNone listed
Feb 10, 2026KB5075941Windows 11 23H222631.6649Security updateNone listed

January 2026

ReleasedUpdateBuildTypeKnown issues · our guide
Jan 29, 2026KB507410526200.7705, 26100.7705Optional previewNone listed
Jan 24, 2026KB507812726200.7628, 26100.7628Out-of-bandNone listed
Jan 24, 2026KB5078132Windows 11 23H222631.6495Out-of-bandNone listed
Jan 17, 2026KB507774426200.7627, 26100.7627Out-of-bandNone listed
Jan 17, 2026KB5077797Windows 11 23H222631.6494Out-of-bandNone listed
Jan 13, 2026KB507410926200.7623, 26100.7623Security updateNone listed
Jan 13, 2026KB5073455Windows 11 23H222631.6491Security updateNone listed

December 2025

ReleasedUpdateBuildTypeKnown issues · our guide
Dec 9, 2025KB507203326200.7462, 26100.7462Security updateNone listed
Dec 9, 2025KB5071417Windows 11 23H222631.6345Security updateNone listed
Dec 1, 2025KB507031126200.7309, 26100.7309Optional previewNone listed

November 2025

ReleasedUpdateBuildTypeKnown issues · our guide
Nov 20, 2025KB5070312Windows 11 23H222631.6276Optional previewNone listed
Nov 11, 2025KB506886126200.7171, 26100.7171Security updateNone listed
Nov 11, 2025KB5068865Windows 11 23H222631.6199Security updateNone listed

October 2025

ReleasedUpdateBuildTypeKnown issues · our guide
Oct 28, 2025KB506703626200.7019, 26100.7019Optional previewNone listed
Oct 28, 2025KB5067112Windows 11 23H222631.6133Optional previewNone listed
Oct 20, 2025KB507077326200.6901, 26100.6901Out-of-bandNone listed
Oct 14, 2025KB506683526200.6899, 26100.6899Security updateNone listed
Oct 14, 2025KB5066793Windows 11 23H222621.6060, 22631.6060Security updateNone listed