December 2014 update for Microsoft Silverlight 5

Applies to: SilverlightSilverlight

Should I install this update?

  • This update was released on December 12, 2014 and offers a new build (version 5.1.31211.0) of Microsoft Silverlight for users of recalled version 5.1.31010.0. For more information about Silverlight, go to the What is Silverlight? section.
  • This update is included in current Silverlight installers. If you do not have Silverlight installed, the update will be offered to you on compatible systems by Microsoft Update.
If you do not want to install this update, go to the How to hide this update so that it does not appear again section.

Improvements in this update

Fixes an issue that generated errors when you tried to play Microsoft PlayReady Digital Rights Management (DRM) content in Silverlight version 5.1.31010.0.

How to obtain this update

This update is available from the following sources.

Microsoft Update

This update is available from Microsoft Update. If you have an earlier version of Silverlight installed, this update will be offered as "Update for Microsoft Silverlight (KB3011970)."

Silverlight update information

Restart requirement

You do not have to restart the computer after you apply this update.

Note If you have had an earlier version of Silverlight installed, or if you are using Mozilla Firefox, you must restart your browser.

How to verify whether Silverlight is installed

Verify your installation by visiting the Silverlight installation page.

More Information

For more information about Silverlight, go to the following Microsoft websites:


For more information about the Silverlight version 5.1.31211.0, go to the following article in the Microsoft Knowledge Base:

3025055 New Silverlight version is available to replace version 5.1.31010.0