April 2021 CU for SharePoint Server 2016 is available for download

The product group released the April 2021 Cumulative Update for SharePoint Server 2016 product family.

This CU also includes Feature Pack 1 which was released with December 2016 CU and Feature Pack 2 which was released with September 2017 CU.

The KB articles for April 2021 CU are available here:

  • KB 4504719 – April 2021 Update for SharePoint Server 2016 (language independent) – This is also a security update!
  • KB 4504723 – April 2021 Update for SharePoint Server 2016 (language dependent) – This is also a security update!

The download for April 2021 CU is available here:

Important: It is required to install both fixes (language dependent and independent) to fully patch a SharePoint server. This applies also to servers which do not have language packs installed. The reason is that each SharePoint installation includes a language dependent component together with a language independent component. If additional language packs are added later (only) the language dependent fix has to be applied again.

It is irrelevant which language you pick on the drop down in download center. Even the language dependent fixes are all in the same package for all languages.

After installing the fixes you need to run the SharePoint 2016 Products Configuration Wizard on each machine in the farm. If you prefer to run the command line version psconfig.exe ensure to have a look here for the correct options.

SharePoint 2016 April 2021 CU Build Numbers:

Language independent fix: 16.0.5149.1000
Language dependent fix: 16.0.5149.1000

To understand the different version numbers please have a look at my article which explains the different SharePoint build numbers.

Please ensure to have a look at the SharePoint Patching Best Practices before applying new fixes.

Related Links:


  1. Hello,
    We have noticed that sword.dll files is not updated post applying this CU patch


    1. Hello!
      I also have sword.dll not updating – SP 2016


      1. Hi Chuck,
        I would recommend to open a support case with Microsoft to get this investigated.


  2. After I installed above 2 patches and run Configuration wizard, I got below error:

    An exception of type Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException was thrown. Additional exception information:
    Upgrade [SPContentDatabase Name=WSS_Content] failed. (EventID:an59t)

    Exception: The upgraded database schema doesn’t match the TargetSchema (EventID:an59t)


    Upgrade Timer job is exiting due to exception: Microsoft.SharePoint.Upgrade.SPUpgradeException: The upgraded database schema doesn’t match the TargetSchema

    Do you know the reason?


    1. Hi Mark,
      Try upgrading the affected DBs manually with Power Shell – Upgrade-SPContentDatabase and retry the Configuration Wizard. This worked for me.



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