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Editorial Team
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Asked: 2026-06-16T05:58:26+00:00

We are getting an assembly conflict after we updated Newtonsoft.Json. I am having trouble

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We are getting an assembly conflict after we updated Newtonsoft.Json. I am having trouble understanding where the specific version that is referenced in the error is coming from. There is nothing in the web.config that points to a specific version.

System.IO.FileLoadException: Could not load file or assembly
‘Newtonsoft.Json, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=30ad4fe6b2a6aeed’ or one of its dependencies. The
located assembly’s manifest definition does not match the assembly
reference. (Exception from HRESULT: 0x80131040)

Would GAC-ing the two versions of the assembly work to solve the issue?

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1 Answer

  1. Editorial Team

    GACing them might work but it will create a maintenance nightmare. Don’t do it!

    I think you have 2 options:

    1. Use the version that came with Sitecore which will depend on which version of Sitecore you are running.
    2. Leave the one sitecore version untouched and use ilmerge to combine the Newtonsoft.Json version you need with your own assembly.

    I would recommend 1 if you don’t need any of the most recent features of the library like (dynamics… etc)

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