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@dependabot dependabot bot commented on behalf of github Jan 12, 2026

Updated DocumentFormat.OpenXml from 3.3.0 to 3.4.1.

Release notes

Sourced from DocumentFormat.OpenXml's releases.

3.4.1

Added

  • Added MediaDataPartType.Mp4 to support MP4 video media parts in presentations and documents (#​1866)
  • Updated bundled Open XML schemas to the Q3 2025 Office release, enabling newer document and presentation features (#​1963)

Changed

  • Reduced JIT and AOT size and improved document load performance by removing the generic builder pattern from element metadata creation (#​1842, #​1843)
  • Optimized FromChunkedBase64String to significantly reduce allocations and improve throughput when decoding chunked base64 content (≈2.4× faster, ≈70% less memory) (#​1868)

Fixed

  • Switched to XmlDOMTextWriter instead of XmlWriter.Create to correctly handle serialization of certain XML content (#​1869, #​1961)
  • Added a clear error when attempting to open encrypted documents that the SDK cannot process (#​1635, #​1969)
  • Improved exception messages when required package parts are missing by including the name of the missing part (#​1971, #​1974)

Documentation

  • Clarified the README SDK description and simplified the note on 3.0.0 breaking changes (#​1858)
  • Documented that disposing a package with AutoSave set to false does not persist changes (#​1873)
  • Removed the PowerPoint modern comments sample, which now lives on learn.microsoft.com (#​1861)

Thanks to the following for their contributions:

@​QuocDatHoang
@​Varorbc

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---
updated-dependencies:
- dependency-name: DocumentFormat.OpenXml
  dependency-version: 3.4.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels Jan 12, 2026
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