What's new in KB5126653 (Windows 11 build 22621.7652)

Known issues

Microsoft reports no known issues for this update.

Should you install it?

Yes, you should install KB5126653 as soon as it becomes available for your machine. Because this is a standard monthly security update rather than an optional preview build, it contains essential security patches designed to keep your operating system secure. Delaying mandatory updates leaves your computer vulnerable to unpatched security weaknesses.

For general home users, allowing Windows Update to apply the update during normal maintenance windows is the best approach. If you manage multiple devices or rely on your PC for mission-critical work, you can let it complete during off-hours to avoid unexpected reboot interruptions. Since there are no known issues documented by Microsoft, there is no need to defer or block this package.

How to get it

There are two primary methods to install KB5126653 on your device: through the standard Windows Update interface or via manual installation from the Microsoft Update Catalog.

Method 1: Install using Windows Update

This is the simplest and safest way to receive the update. Follow these steps to check for and install it:

1. Open Settings by pressing the Windows key + I shortcut on your keyboard, or by opening the Start menu and selecting the gear icon.
2. In the left-hand navigation menu, select Windows Update.
3. Click the Check for updates button located at the top of the window.
4. Windows Update will scan Microsoft's servers. When KB5126653 appears in the list, it will begin downloading and installing automatically.
5. Once the installation reaches 100%, click Restart now to reboot your computer and finalize the transition to OS Build 22621.7652.

Method 2: Download from the Microsoft Update Catalog

If your computer has trouble downloading packages through Windows Update, or if you need to update an offline system, you can obtain the standalone installer directly:

1. Open your web browser and navigate to the official Microsoft Update Catalog website.
2. In the search box in the top-right corner, enter KB5126653 and press Enter.
3. Locate the package corresponding to Windows 11, version 23H2 matching your computer's processor architecture.
4. Click the Download button next to the entry, then click the .msu file link in the pop-up window to save it to your storage drive.
5. Double-click the downloaded .msu file to run the Windows Update Standalone Installer. Follow the on-screen prompts and reboot your computer when instructed.

What to do if the update fails to install

If the installation fails with an error or gets stuck during the download phase, work through these standard troubleshooting steps from safest to most involved:

1. Reboot your PC: A simple restart terminates locked background processes and clears temporary update caches.
2. Run the troubleshooter: Navigate to Settings > System > Troubleshoot > Other troubleshooters. Find Windows Update in the list and click Run. Allow Windows to automatically reset update services and repair configurations.
3. Check storage space: Ensure your system drive has at least 15 GB of free space so the installer has room to unpack files.
4. Repair system file corruption: Warning: Running repair tools modifies protected operating system components. Ensure you save all open work before proceeding. Right-click the Start menu button, select Terminal (Admin) or Command Prompt (Admin), type sfc /scannow, and press Enter. Once that scan finishes, run DISM /Online /Cleanup-Image /RestoreHealth to repair any damaged component store files before attempting to reinstall the update.