Note: The Internet Explorer 11 desktop application will be retired and go out of support on June 15, 2022 (for a list of what's in scope, see the FAQ). The same IE11 apps and sites you use today can open in Microsoft Edge with Internet Explorer mode. Learn more here.

About this update

There is consensus across the industry that the RC4 cipher is no longer cryptographically secure, and therefore RC4 support is being removed with this update. With this change, Microsoft Edge and Internet Explorer 11 are aligned with the most recent versions of Google Chrome and Mozilla Firefox.

For detailed information about RC4 cipher removal in Microsoft Edge and Internet Explorer 11, see RC4 will no longer be supported in Microsoft Edge and IE11.

If you want to turn on RC4 support, see details in the More information section.

How to get this update

For Internet Explorer 11 in Windows 8.1 or Windows 7

Install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.

Note This update was first included in the MS16-095: Security update for Internet Explorer: August 9, 2016.
 

For Internet Explorer 11 and Microsoft Edge in Windows 10

To have this change apply for Internet Explorer 11 and Microsoft Edge in Windows 10 or Windows 10 version 1511, you must install one of the following updates:

References

Learn about the terminology that Microsoft uses to describe software updates.

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