May 2021 CU for SharePoint Server 2019 is available for download

The product group released the May 2021 Cumulative Update for SharePoint Server 2019 product family. SharePoint Server 2019 is patched with a language dependent and a language independent fix.

The KB article for May 2021 CU will be available at the following Location in a couple of hours:

  • KB 5001916 – May 2021 Update for SharePoint Server 2019 (language independent) – This is also a security update!
  • KB 5001915 – May 2021 Update for SharePoint Server 2019 (language dependent)

The download for May 2021 CU is available through the following link:

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 2019 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.

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

SharePoint 2019 May 2021 CU Build Number:

Language independent fix: 16.0.10374.20000
Language dependent fix: 16.0.10374.20000

Related Links:


  1. Hi issue with the attachments after installing the March 2021 CU was fixed in this release?


    1. Yes, I tested it and is fixed.


  2. Does anyone encounter this error after running psconfig? An exception of type System.InvalidOperationException was thrown. Additional exception information: An internal error occurred. The program cannot continue to run. The program stopped because of the following: Copy SideBySide files for In Place Upgrade failed.


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