Windows 11, version 26H1 August 11, 2026—KB5121000 (OS Build 28000.2704) July 28, 2026—KB5101681 (OS Build 28000.2608) Preview July 14, 2026—KB5101649 (OS Build 28000.2525) June 23, 2026—KB5095091 (OS Build 28000.2340) Preview June 9, 2026—KB5095051 (OS Build 28000.2269) May 26, 2026—KB5089570 (OS Build 28000.2179) Preview May 12, 2026—KB5089548 (OS Build 28000.2113) April 30, 2026—KB5083806 (OS Build 28000.1896) Preview April 14, 2026—KB5083768 (OS Build 28000.1836) March 26, 2026—KB5079489 (OS Build 28000.1764) Preview March 10, 2026—KB5079466 (OS Build 28000.1719) February 24, 2026—KB5077239 (OS Build 28000.1643) Preview February 10, 2026—KB5077179 (OS Build 28000.1575) Windows 11, version 25H2 August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168) July 28, 2026—KB5101684 (OS Builds 26200.8973 and 26100.8973) Preview July 18, 2026—KB5121767 (OS Builds 26200.8894 and 26100.8894) Out-of-band July 14, 2026—KB5101650 (OS Builds 26200.8875 and 26100.8875) June 23, 2026—KB5095093 (OS Builds 26200.8737 and 26100.8737) Preview June 9, 2026—KB5094126 (OS Builds 26200.8655 and 26100.8655) May 26, 2026—KB5089573 (OS Builds 26200.8524 and 26100.8524) Preview May 12, 2026—KB5089549 (OS Builds 26200.8457 and 26100.8457) April 30, 2026—KB5083631 (OS Builds 26200.8328 and 26100.8328) Preview April 14, 2026—KB5083769 (OS Builds 26200.8246 and 26100.8246) March 31, 2026—KB5086672 (OS Builds 26200.8117 and 26100.8117) Out-of-band March 26, 2026—KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview March 21, 2026—KB5085516 (OS Builds 26200.8039 and 26100.8039) Out-of-band March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037) February 24, 2026—KB5077241 (OS Builds 26200.7922 and 26100.7922) Preview February 10, 2026—KB5077181 (OS Builds 26200.7840 and 26100.7840) January 29, 2026—KB5074105 (OS Builds 26200.7705 and 26100.7705) Preview January 24, 2026—KB5078127 (OS Builds 26200.7628 and 26100.7628) Out-of-band January 17, 2026—KB5077744 (OS Builds 26200.7627 and 26100.7627) Out-of-band January 13, 2026—KB5074109 (OS Builds 26200.7623 and 26100.7623) December 9, 2025—KB5072033 (OS Builds 26200.7462 and 26100.7462) December 1, 2025—KB5070311 (OS Builds 26200.7309 and 26100.7309) Preview November 11, 2025—KB5068861 (OS Builds 26200.7171 and 26100.7171) October 28, 2025—KB5067036 (OS Builds 26200.7019 and 26100.7019) Preview October 20, 2025—KB5070773 (OS Builds 26200.6901 and 26100.6901) Out-of-band October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899) September 29, 2025—KB5065789 (OS Build 26100.6725) Preview Windows 11, version 24H2 August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168) July 28, 2026—KB5101684 (OS Builds 26200.8973 and 26100.8973) Preview July 18, 2026—KB5121767 (OS Builds 26200.8894 and 26100.8894) Out-of-band July 14, 2026—KB5101650 (OS Builds 26200.8875 and 26100.8875) June 23, 2026—KB5095093 (OS Builds 26200.8737 and 26100.8737) Preview June 9, 2026—KB5094126 (OS Builds 26200.8655 and 26100.8655) May 26, 2026—KB5089573 (OS Builds 26200.8524 and 26100.8524) Preview May 12, 2026—KB5089549 (OS Builds 26200.8457 and 26100.8457) April 30, 2026—KB5083631 (OS Builds 26200.8328 and 26100.8328) Preview April 14, 2026—KB5083769 (OS Builds 26200.8246 and 26100.8246) March 31, 2026—KB5086672 (OS Builds 26200.8117 and 26100.8117) Out-of-band March 26, 2026—KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview March 21, 2026—KB5085516 (OS Builds 26200.8039 and 26100.8039) Out-of-band March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037) February 24, 2026—KB5077241 (OS Builds 26200.7922 and 26100.7922) Preview February 10, 2026—KB5077181 (OS Builds 26200.7840 and 26100.7840) January 29, 2026—KB5074105 (OS Builds 26200.7705 and 26100.7705) Preview January 24, 2026—KB5078127 (OS Builds 26200.7628 and 26100.7628) Out-of-band January 17, 2026—KB5077744 (OS Builds 26200.7627 and 26100.7627) Out-of-band January 13, 2026—KB5074109 (OS Builds 26200.7623 and 26100.7623) December 9, 2025—KB5072033 (OS Builds 26200.7462 and 26100.7462) December 1, 2025—KB5070311 (OS Builds 26200.7309 and 26100.7309) Preview November 11, 2025—KB5068861 (OS Builds 26200.7171 and 26100.7171) October 28, 2025—KB5067036 (OS Builds 26200.7019 and 26100.7019) Preview October 20, 2025—KB5070773 (OS Builds 26200.6901 and 26100.6901) Out-of-band October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899) September 29, 2025—KB5065789 (OS Build 26100.6725) Preview September 22, 2025—KB5068221 (OS Build 26100.6588) Out-of-band September 9, 2025—KB5065426 (OS Build 26100.6584) August 29, 2025—KB5064081 (OS Build 26100.5074) Preview August 12, 2025—KB5063878 (OS Build 26100.4946) July 22, 2025—KB5062660 (OS Build 26100.4770) Preview July 13, 2025—KB5064489 (OS Build 26100.4656) Out-of-band July 8, 2025—KB5062553 (OS Build 26100.4652) June 26, 2025—KB5060829 (OS Build 26100.4484) Preview June 11, 2025—KB5063060 (OS Build 26100.4351) Out-of-band June 10, 2025—KB5060842 (OS Build 26100.4349) May 28, 2025—KB5058499 (OS Build 26100.4202) Preview May 27, 2025—KB5061977 (OS Build 26100.4066) Out-of-band May 13, 2025—KB5058411 (OS Build 26100.4061) April 25, 2025—KB5055627(OS Build 26100.3915) Preview April 8, 2025—KB5055523 (OS Build 26100.3775) March 27, 2025—KB5053656 (OS Build 26100.3624) Preview March 11, 2025—KB5053598 (OS Build 26100.3476) February 25, 2025—KB5052093 (OS Build 26100.3323) Preview February 11, 2025—KB5051987 (OS Build 26100.3194) January 28, 2025—KB5050094 (OS Build 26100.3037) Preview January 14, 2025—KB5050009 (OS Build 26100.2894) December 10, 2024—KB5048667 (OS Build 26100.2605) November 21, 2024—KB5046740 (OS Build 26100.2454) Preview November 12, 2024—KB5046617 (OS Build 26100.2314) October 24, 2024—KB5044384 (OS Build 26100.2161) Preview October 8, 2024—KB5044284 (OS Build 26100.2033) September 30, 2024—KB5043178 (OS Build 26100.1882) Preview September 10, 2024—KB5043080 (OS Build 26100.1742) August 27, 2024—KB5041865 (OS Build 26100.1591) Preview August 13, 2024—KB5041571 (OS Build 26100.1457) July 30, 2024—KB5040529 (OS Build 26100.1301) Preview July 9, 2024—KB5040435 (OS Build 26100.1150) June 28, 2024—KB5039304 (OS Build 26100.1000) Preview June 15, 2024—KB5039239 (OS Build 26100.863) Windows 11, version 23H2 August 11, 2026—KB5120240 (OS Build 22631.7517) July 14, 2026—KB5099414 (OS Build 22631.7376) June 9, 2026—KB5093998 (OS Build 22631.7219) May 12, 2026—KB5087420 (OS Build 22631.7079) April 14, 2026—KB5082052 (OS Build 22631.6936) March 10, 2026—KB5078883 (OS Build 22631.6783) February 10, 2026—KB5075941 (OS Build 22631.6649) January 24, 2026—KB5078132 (OS Build 22631.6495) Out-of-band January 17, 2026—KB5077797 (OS Build 22631.6494) Out-of-band January 13, 2026—KB5073455 (OS Build 22631.6491) December 9, 2025—KB5071417 (OS Build 22631.6345) November 20, 2025—KB5070312 (OS Build 22631.6276) Preview November 11, 2025—KB5068865 (OS Build 22631.6199) October 28, 2025—KB5067112 (OS Build 22631.6133) Preview October 14, 2025—KB5066793 (OS Builds 22621.6060 and 22631.6060) September 23, 2025—KB5065790 (OS Build 22631.5984) Preview September 9, 2025—KB5065431 (OS Builds 22621.5909 and 22631.5909) August 26, 2025—KB5064080 (OS Build 22631.5840) Preview August 19, 2025—KB5066189 (OS Builds 22621.5771 and 22631.5771) Out-of-band August 12, 2025—KB5063875 (OS Builds 22621.5768 and 22631.5768) July 22, 2025—KB5062663 (OS Builds 22631.5699) Preview July 8, 2025—KB5062552 (OS Builds 22621.5624 and 22631.5624) June 26, 2025—KB5060826 (OS Builds 22621.5549 and 22631.5549) Preview June 10, 2025—KB5060999 (OS Builds 22621.5472 and 22631.5472) May 31, 2025—KB5062170 (OS Builds 22621.5415 and 22631.5415) Out-of-band May 27, 2025—KB5058502 (OS Builds 22621.5413 and 22631.5413) Preview May 13, 2025—KB5058405 (OS Builds 22621.5335 and 22631.5335) April 22, 2025—KB5055629 (OS Builds 22621.5262 and 22631.5262) Preview April 11, 2025—KB5058919 (OS Builds 22621.5192 and 22631.5192) Out-of-band April 8, 2025—KB5055528 (OS Builds 22621.5189 and 22631.5189) March 25, 2025—KB5053657 (OS Builds 22621.5126 and 22631.5126) Preview March 11, 2025—KB5053602 (OS Builds 22621.5039 and 22631.5039) February 25, 2025—KB5052094 (OS Builds 22621.4974 and 22631.4974) Preview February 11, 2025—KB5051989 (OS Builds 22621.4890 and 22631.4890) January 29, 2025—KB5050092 (OS Builds 22621.4830 and 22631.4830) Preview January 14, 2025—KB5050021 (OS Builds 22621.4751 and 22631.4751) December 10, 2024—KB5048685 (OS Builds 22621.4602 and 22631.4602) November 21, 2024—KB5046732 (OS Builds 22621.4541 and 22631.4541) Preview November 12, 2024—KB5046633 (OS Builds 22621.4460 and 22631.4460) October 22, 2024—KB5044380 (OS Builds 22621.4391 and 22631.4391) Preview October 8, 2024—KB5044285 (OS Builds 22621.4317 and 22631.4317) September 26, 2024—KB5043145 (OS Builds 22621.4249 and 22631.4249) Preview September 10, 2024—KB5043076 (OS Builds 22621.4169 and 22631.4169) August 27, 2024—KB5041587 (OS Builds 22621.4112 and 22631.4112) Preview August 13, 2024—KB5041585 (OS Builds 22621.4037 and 22631.4037) July 25, 2024—KB5040527 (OS Builds 22621.3958 and 22631.3958) Preview July 9, 2024—KB5040442 (OS Builds 22621.3880 and 22631.3880) June 25, 2024—KB5039302 (OS Builds 22621.3810 and 22631.3810) Preview June 11, 2024—KB5039212 (OS Builds 22621.3737 and 22631.3737) May 29, 2024—KB5037853 (OS Builds 22621.3672 and 22631.3672) Preview May 14, 2024—KB5037771 (OS Builds 22621.3593 and 22631.3593) April 23, 2024—KB5036980 (OS Builds 22621.3527 and 22631.3527) Preview April 9, 2024—KB5036893 (OS Builds 22621.3447 and 22631.3447) March 26, 2024—KB5035942 (OS Builds 22621.3374 and 22631.3374) Preview March 12, 2024—KB5035853 (OS Builds 22621.3296 and 22631.3296) February 29, 2024—KB5034848 (OS Builds 22621.3235 and 22631.3235) Preview February 13, 2024—KB5034765 (OS Builds 22621.3155 and 22631.3155) January 23, 2024—KB5034204 (OS Builds 22621.3085 and 22631.3085) Preview January 9, 2024—KB5034123 (OS Builds 22621.3007 and 22631.3007) December 12, 2023—KB5033375 (OS Builds 22621.2861 and 22631.2861) December 4, 2023—KB5032288 (OS Builds 22621.2792 and 22631.2792) Preview November 14, 2023—KB5032190 (OS Builds 22621.2715 and 22631.2715) October 31, 2023—KB5031455 (OS Builds 22621.2506 and 22631.2506) Preview Windows 11, version 22H2 End of servicing statement October 14, 2025—KB5066793 (OS Builds 22621.6060 and 22631.6060) September 9, 2025—KB5065431 (OS Builds 22621.5909 and 22631.5909) August 19, 2025—KB5066189 (OS Builds 22621.5771 and 22631.5771) Out-of-band August 12, 2025—KB5063875 (OS Builds 22621.5768 and 22631.5768)

July 22, 2025—KB5062663 (OS Builds 22621.5699) Preview July 8, 2025—KB5062552 (OS Builds 22621.5624 and 22631.5624) June 26, 2025—KB5060826 (OS Builds 22621.5549 and 22631.5549) Preview June 10, 2025—KB5060999 (OS Builds OS 22621.5472 and 22631.5472) May 31, 2025—KB5062170 (OS Builds 22621.5415 and 22631.5415) Out-of-band May 27, 2025—KB5058502 (OS Builds 22621.5413 and 22631.5413) Preview May 13, 2025—KB5058405 (OS Builds 22621.5335 and 22631.5335) April 22, 2025—KB5055629 (OS Builds 22621.5262 and 22631.5262) Preview April 11, 2025—KB5058919 (OS Builds 22621.5192 and 22631.5192) Out-of-band April 8, 2025—KB5055528 (OS Builds 22621.5191 and 22631.5191) March 25, 2025—KB5053657 (OS Builds 22621.5126 and 22631.5126) Preview March 11, 2025—KB5053602 (OS Builds 22621.5039 and 22631.5039) February 25, 2025—KB5052094 (OS Builds 22621.4974 and 22631.4974) Preview February 11, 2025—KB5051989 (OS Builds 22621.4890 and 22631.4890) January 29, 2025—KB5050092 (OS Builds 22621.4830 and 22631.4830) Preview January 14, 2025—KB5050021 (OS Builds 22621.4751 and 22631.4751) December 10, 2024—KB5048685 (OS Builds 22621.4602 and 22631.4602) November 21, 2024—KB5046732 (OS Builds 22621.4541 and 22631.4541) Preview November 12, 2024—KB5046633 (OS Builds 22621.4460 and 22631.4460) October 22, 2024—KB5044380 (OS Builds 22621.4391 and 22631.4391) Preview October 8, 2024—KB5044285 (OS Builds 22621.4317 and 22631.4317) September 26, 2024—KB5043145 (OS Builds 22621.4249 and 22631.4249) Preview September 10, 2024—KB5043076 (OS Builds 22621.4169 and 22631.4169) August 27, 2024—KB5041587 (OS Builds 22621.4112 and 22631.4112) Preview August 13, 2024—KB5041585 (OS Builds 22621.4037 and 22631.4037) July 25, 2024—KB5040527 (OS Builds 22621.3958 and 22631.3958) Preview July 9, 2024—KB5040442 (OS Builds 22621.3880 and 22631.3880) June 25, 2024—KB5039302 (OS Builds 22621.3810 and 22631.3810) Preview June 11, 2024—KB5039212 (OS Builds 22621.3737 and 22631.3737) May 29, 2024—KB5037853 (OS Builds 22621.3672 and 22631.3672) Preview May 14, 2024—KB5037771 (OS Builds 22621.3593 and 22631.3593) April 23, 2024—KB5036980 (OS Builds 22621.3527 and 22631.3527) Preview April 9, 2024—KB5036893 (OS Builds 22621.3447 and 22631.3447) March 26, 2024—KB5035942 (OS Builds 22621.3374 and 22631.3374) Preview March 12, 2024—KB5035853 (OS Builds 22621.3296 and 22631.3296) February 29, 2024—KB5034848 (OS Builds 22621.3235 and 22631.3235) Preview February 13, 2024—KB5034765 (OS Builds 22621.3155 and 22631.3155) January 23, 2024—KB5034204 (OS Builds 22621.3085 and 22631.3085) Preview January 9, 2024—KB5034123 (OS Builds 22621.3007 and 22631.3007) December 12, 2023—KB5033375 (OS Builds 22621.2861 and 22631.2861) December 4, 2023—KB5032288 (OS Builds 22621.2792 and 22631.2792) Preview November 14, 2023—KB5032190 (OS Builds 22621.2715 and 22631.2715) October 31, 2023—KB5031455 (OS Builds 22621.2506 and 22631.2506) Preview October 10, 2023—KB5031354 (OS Build 22621.2428) September 26, 2023—KB5030310 (OS Build 22621.2361) Preview September 12, 2023—KB5030219 (OS Build 22621.2283) August 22, 2023—KB5029351 (OS Build 22621.2215) Preview August 8, 2023—KB5029263 (OS Build 22621.2134) July 26, 2023—KB5028254 (OS Build 22621.2070) Preview July 11, 2023—KB5028185 (OS Build 22621.1992) June 27, 2023—KB5027303 (OS Build 22621.1928) Preview June 13, 2023—KB5027231 (OS Build 22621.1848) May 24, 2023—KB5026446 (OS Build 22621.1778) Preview May 9, 2023—KB5026372 (OS Build 22621.1702) April 25, 2023—KB5025305 (OS Build 22621.1635) Preview April 11, 2023—KB5025239 (OS Build 22621.1555) March 28, 2023—KB5023778 (OS Build 22621.1485) Preview March 14, 2023—KB5023706 (OS Build 22621.1413) February 28, 2023—KB5022913 (OS Build 22621.1344) Preview February 14, 2023—KB5022845 (OS Build 22621.1265) January 26, 2023—KB5022360 (OS Build 22621.1194) Preview January 10, 2023—KB5022303 (OS Build 22621.1105) December 13, 2022—KB5021255 (OS Build 22621.963) November 29, 2022—KB5020044 (OS Build 22621.900) Preview November 8, 2022—KB5019980 (OS Build 22621.819) October 25, 2022—KB5018496 (OS Build 22621.755) Preview October 18, 2022—KB5019509 (OS Build 22621.675) Out-of-band October 11, 2022—KB5018427 (OS Build 22621.674) September 30, 2022—KB5017389 (OS Build 22621.608) Preview Windows 11, version 21H2 October 8, 2024—KB5044280 (OS Build 22000.3260) September 10, 2024—KB5043067 (OS Build 22000.3197) August 13, 2024—KB5041592 (OS Build 22000.3147) July 9, 2024—KB5040431 (OS Build 22000.3079) June 11, 2024—KB5039213 (OS Build 22000.3019) May 14, 2024—KB5037770 (OS Build 22000.2960) April 9, 2024—KB5036894 (OS Build 22000.2899) March 12, 2024—KB5035854 (OS Build 22000.2836) February 13, 2024—KB5034766 (OS Build 22000.2777) January 9, 2024—KB5034121 (OS Build 22000.2713) December 12, 2023—KB5033369 (OS Build 22000.2652) November 14, 2023—KB5032192 (OS Build 22000.2600) October 10, 2023—KB5031358 (OS Build 22000.2538) September 26, 2023—KB5030301 (OS Build 22000.2482) Preview September 12, 2023—KB5030217 (OS Build 22000.2416) August 22, 2023—KB5029332 (OS Build 22000.2360) Preview August 8, 2023—KB5029253 (OS Build 22000.2295) July 25, 2023—KB5028245 (OS Build 22000.2245) Preview July 11, 2023—KB5028182 (OS Build 22000.2176) June 28, 2023—KB5027292 (OS Build 22000.2124) Preview June 13, 2023—KB5027223 (OS Build 22000.2057) May 23, 2023—KB5026436 (OS Build 22000.2003) Preview May 9, 2023—KB5026368 (OS Build 22000.1936) April 25, 2023—KB5025298 (OS Build 22000.1880) Preview April 11, 2023—KB5025224 (OS Build 22000.1817) March 28, 2023—KB5023774 (OS Build 22000.1761) Preview March 14, 2023—KB5023698 (OS Build 22000.1696) February 21, 2023—KB5022905 (OS Build 22000.1641) Preview February 14, 2023—KB5022836 (OS Build 22000.1574) January 19, 2023—KB5019274 (OS Build 22000.1516) Preview January 10, 2023—KB5022287 (OS Build 22000.1455) December 13, 2022—KB5021234 (OS Build 22000.1335) November 15, 2022—KB5019157 (OS Build 22000.1281) Preview November 8, 2022—KB5019961 (OS Build 22000.1219) October 25, 2022—KB5018483 (OS Build 22000.1165) Preview October 17, 2022—KB5020387 (OS Build 22000.1100) Out-of-band October 11, 2022—KB5018418 (OS Build 22000.1098) September 20, 2022—KB5017383 (OS Build 22000.1042) Preview September 13, 2022—KB5017328 (OS Build 22000.978) August 25, 2022—KB5016691 (OS Build 22000.918) Preview August 9, 2022—KB5016629 (OS Build 22000.856) July 21, 2022—KB5015882 (OS Build 22000.832) Preview July 12, 2022—KB5015814 (OS Build 22000.795) June 23, 2022—KB5014668 (OS Build 22000.778) Preview June 20, 2022—KB5016138 (OS Build 22000.740) Out-of-band June 14, 2022—KB5014697 (OS Build 22000.739) May 24, 2022—KB5014019 (OS Build 22000.708) Preview May 10, 2022—KB5013943 (OS Build 22000.675) April 25, 2022—KB5012643 (OS Build 22000.652) Preview April 12, 2022—KB5012592 (OS Build 22000.613) March 28, 2022—KB5011563 (OS Build 22000.593) Preview March 8, 2022—KB5011493 (OS Build 22000.556) February 15, 2022—KB5010414 (OS Build 22000.527) Preview February 8, 2022—KB5010386 (OS Build 22000.493) January 25, 2022—KB5008353 (OS Build 22000.469) Preview January 17, 2022—KB5010795 (OS Build 22000.438) Out-of-band January 11, 2022—KB5009566 (OS Build 22000.434) December 14, 2021—KB5008215 (OS Build 22000.376) November 22, 2021—KB5007262 (OS Build 22000.348) Preview November 9, 2021—KB5007215 (OS Build 22000.318) October 21, 2021—KB5006746 (OS Build 22000.282) Preview October 12, 2021—KB5006674 (OS Build 22000.258) This cumulative update for Windows 11, version 23H2 (KB5120240), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health dashboard for the latest status on this release. Announcements and messages This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices. Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices over the past several months. Devices that haven’t received the newer certificates will continue to start and operate normally, and standard Windows updates will continue to install. Updated certificates will continue to be delivered through Windows Update in the coming months. Windows 11. Version 23H2 Enterprise and Education will reach end of updates on November 10, 2026. Devices running these editions will no longer receive fixes for known issues, time zone updates, technical support, or monthly security and preview updates containing protections from the latest security threats. To stay protected and up to date, we recommend you upgrade to the latest version of Windows 11 . This update addresses security issues for your Windows operating system. Use EKB KB5027397 to update to Windows 11, version 23H2. This security update contains fixes and quality improvements from KB5099414 (released July 14, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change. [Connectivity] This update refreshes the COSA profile for SolNet-Mobile to support the latest mobile operator settings. [Device Management] This update improves reliability for devices managed through mobile device management (MDM) by helping devices continue to perform normally when an MDM certificate expires. [File History] This update improves the reliability of File History backups to SMB network shares, helping scheduled backups access network locations and copy files as expected. [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates . Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months. [Emoji Panel] The emoji panel (Windows key + period (.)) now supports GIPHY following the deprecation of Google's Tenor API. If you've already installed previous updates, your device will download and install only the new updates included in this package. For more information about security vulnerabilities, see the Security Update Guide and the August 2026 Security Update . Windows 11 servicing stack update (KB5120239) - 22621.7513 This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates . Known issues in this update Microsoft is not currently aware of any issues with this update. How to get this update Before you install this update Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates . If you deploy dynamic updates such as this update to an existing Windows image, ensure the boot.stl file is included as part of the installation media. Failure to include the file might prevent devices from successfully starting from the installation media and can result in error code 0xc0430001 . The boot.stl file is used during Secure Boot validation and must match the Windows version and architecture of the image you are updating. To ensure the boot.stl file is included as part of the installation media, do one of the following: Use the Update WinPE script to update an existing Windows image. (Recommended) Manually copy the boot.stl file from the device Windows\Boot\EFI folder to the corresponding folder on your installation media before deploying the update. For information about how to apply Dynamic Update packages to existing Windows images, see Update Windows installation media with Dynamic Update . Install this update To install this update, use one of the following Windows and Microsoft release channels. Server Update Services Product : Windows 11 Classification : Security Updates File information For a list of the files provided in this update, download the file information for cumulative update KB5120240 . For a list of the files provided in the servicing stack update, download the file information for SSU KB5120239 - versions 22621.7513 . Windows release health Microsoft Store for Business and Education with Configuration Manager Get updates for apps and games in Microsoft Store Thank you for your feedback!