How to Manually Update Windows Security on Windows 11

Windows Security is one of the most important built-in security tools in Windows 11. It helps protect your computer against viruses, malware, spyware, ransomware, and other security threats.

Although Windows 11 normally updates Microsoft Defender Antivirus automatically through Windows Update, there are situations where you may want to manually check for and install the latest security intelligence updates.

For example, your antivirus definitions may be outdated, Windows Update may have been paused, or you may simply want to make sure your PC has the latest protection.

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In this guide, I'll show you how to manually update Windows Security on Windows 11.

Method 1: Update Windows Security from the Windows Security App

This is the easiest method.

1. Press the Windows key and search for Windows Security.
2. Open the Windows Security app.
3. Click Virus & threat protection.
4. Under Virus & threat protection updates, click Protection updates.
5. Click Check for updates.

Windows 11 will check Microsoft's servers and download the latest available security intelligence update if one is available.

After the update is installed, you can check the Security intelligence version and Last update information to confirm that your protection is current.

Method 2: Use Windows Update

You can also manually update Windows Security through Windows Update.

1. Press Windows + I to open Settings.
2. Select Windows Update from the left-hand menu.
3. Click Check for updates.
4. Allow Windows 11 to download and install any available updates.
5. Restart your computer if Windows asks you to.

Windows Update can deliver Microsoft Defender Antivirus security intelligence updates alongside other Windows security and system updates.

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Method 3: Use PowerShell

Advanced users can manually trigger a Defender update using PowerShell.

1. Right-click the Start button.
2. Select Terminal (Admin) or PowerShell (Admin).
3. Enter the following command:

Update-MpSignature

4. Press Enter.

Windows will attempt to download the latest Microsoft Defender Antivirus security intelligence updates.

If you want to check your current Defender status afterward, you can use:

Get-MpComputerStatus

Look for information such as the antivirus version and security intelligence version.

Why Should You Keep Windows Security Updated?

Keeping Microsoft Defender up to date is important because new malware and other threats are discovered regularly.

An outdated security intelligence database may not recognize newer threats effectively. Regular updates therefore help Windows Security identify and respond to the latest malware.

The good news is that Windows 11 is designed to update Microsoft Defender automatically. Manual updating is mainly useful when you suspect that automatic updates aren't working properly or you want to immediately check for a newer update.

Final Thoughts

Updating Windows Security manually on Windows 11 is straightforward. For most users, the Windows Security app is the simplest option, while PowerShell provides a useful alternative for advanced users.

If your Windows Security protection updates are consistently failing, however, the problem may be related to Windows Update, internet connectivity, system services, or corrupted Windows components.

Is your Windows Security updating automatically, or have you ever had to update Microsoft Defender manually? Share your experience in the comments.