Issues

• RNTuple NumPy/pandas output depends on the data instead of the field type

  bug
  scikit-hep/uproot5#1760 · Filter by author ariostas opened on Oct 16, 2026
  1

• uproot.iterate broken with xrootd + step_size in MB

  bug (unverified)
  scikit-hep/uproot5#1756 · Filter by author davidlange6 opened on Oct 16, 2026

• Move ROOT metadata parsing to rootfilespec

  scikit-hep/uproot5#1754 · Filter by author ariostas opened on Oct 14, 2026

• Investigate intermittent Windows NumPy 1 CI PermissionError on cached test fixtures

  scikit-hep/uproot5#1742 · Filter by author ianna opened on Oct 3, 2026

• Optional compiled-kernel acceleration for the AsVector/AsString basket walk — measured data and a question

  scikit-hep/uproot5#1724 · Filter by author 0xamlab opened on Sep 20, 2026

• Support RNTuple attributes

  feature
  scikit-hep/uproot5#1721 · Filter by author ariostas opened on Sep 14, 2026

• RNTuple: top-level tuple fields do not round-trip as tuples

  scikit-hep/uproot5#1714 · Filter by author ariostas opened on Aug 27, 2026
  1

• RNTuple: optional records lose their optionality, turning None into []

  scikit-hep/uproot5#1713 · Filter by author ariostas opened on Aug 27, 2026

• awkward_pandas is outdated and AwkwardExtensionArray breaks HDF5 export

  bug (unverified)
  scikit-hep/uproot5#1706 · Filter by author 2xB opened on Aug 18, 2026
  1

• GPT 5.6 Sol review of Uproot

  bugperformance
  scikit-hep/uproot5#1688 · Filter by author ariostas opened on Jul 21, 2026

• Consider moving away from cramjam

  scikit-hep/uproot5#1685 · Filter by author ariostas opened on Jul 17, 2026

• Implement expression support for RNTuples

  scikit-hep/uproot5#1673 · Filter by author ariostas opened on Jul 2, 2026
  8

• Skimming with coffea and writing out RNTuples takes forever to read them back up

  bug (unverified)
  scikit-hep/uproot5#1637 · Filter by author ikrommyd opened on May 31, 2026
  8

• Pylance complains about uproot.open

  bug (unverified)
  scikit-hep/uproot5#1608 · Filter by author Superharz opened on Mar 26, 2026
  2

• recreate() opens remote sinks in r+b mode, breaking simplecache:: write caching

  bug (unverified)
  scikit-hep/uproot5#1581 · Filter by author MoAly98 opened on Feb 17, 2026

• Add repository custom instructions for GitHub Copilot

  feature
  Feature

  scikit-hep/uproot5#1549 · Filter by author ianna opened on Jan 5, 2026
  

• Maybe replace filename-handling with universal-pathlib?

  feature
  scikit-hep/uproot5#1545 · Filter by author jpivarski opened on Jan 2, 2026
  4

• Forward slashes in object names break reading

  bug (unverified)
  scikit-hep/uproot5#1541 · Filter by author alexander-held opened on Dec 16, 2025
  2

• 2D PlottableHistogram with kind='MEAN' (i.e. 2D profile plots) not supported yet

  feature
  scikit-hep/uproot5#1534 · Filter by author wiso opened on Dec 5, 2025 · v5.7.6
  5

• Writing profiles with storage=WeightedMean()

  bug (unverified)
  scikit-hep/uproot5#1533 · Filter by author wiso opened on Dec 5, 2025 · v5.7.6
  9

• Incorrect writing of jagged arrays into a TTree

  bug (unverified)
  scikit-hep/uproot5#1490 · Filter by author vpec0 opened on Aug 29, 2025
  23

  

• TTree/RNTuple attribute to keep track of the loaded branches

  feature
  scikit-hep/uproot5#1489 · Filter by author ikrommyd opened on Aug 29, 2025
  1

  

• Add a regression test for RNTuple PHYSLITE

  tests
  scikit-hep/uproot5#1471 · Filter by author matthewfeickert opened on Jul 17, 2025

• Issue with reading custom classes in TTree branches

  bug (unverified)
  scikit-hep/uproot5#1455 · Filter by author gpronost opened on Jul 3, 2025

• Files passing through Cloudflare can no longer be read over http

  bug (unverified)
  scikit-hep/uproot5#1453 · Filter by author ariostas opened on Jun 19, 2025
  4