Updated April 9, 2025: This message was updated to reflect the current availability of Windows 10 2015 LTSB.
The April 2025 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 and Windows 10 update history pages. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.
Highlights for the Windows 11, version 24H2 update:
- This security update includes improvements that were a part of update KB5053656 (released March 27, 2025).
- This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
- This update addresses an issue where machine passwords might not rotate correctly in the Identity Update Manager, which can result in user authentication issues.
- This update adds support for the Aysen region in Chile Daylight Saving Time (DST) change in 2025. For more info about DST changes, see the Daylight Saving Time & Time Zone Blog.
Short on time? Watch our Windows 11 release notes video for this month's tips.
For instructions on how to install this update, see the KB for your operating system listed below:
- Windows 11, version 24H2: KB5055523
- Windows 11, versions 23H2 and 22H2: KB5055528
- Windows 10, versions 22H2 and 21H2: KB5055518
- Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5055519
- Windows 10 LTSB 2016 and Windows Server 2016: KB5055521
- Windows 10 LTSB 2015: KB5055547
- Windows Server 2025: KB5055523
- Windows Server 2022: KB5055526
- Windows Server 2012 R2: Monthly Rollup: KB5055557
- Windows Server 2012: Monthly Rollup: KB5055581
- Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5055561 / Security Only: KB5055570
- Windows Server 2008 SP2: Monthly Rollup: KB5055609 / Security Only: KB5055596