Issues

• uproot.iterate / uproot.concatenate fail on an already-open TTree: unexpected keyword argument 'filter_field'

  scikit-hep/uproot5#1796 · Filter by author lgray opened on Oct 29, 2026

• bug: GPU RNTuple reads index cluster buffers by absolute cluster number

  scikit-hep/uproot5#1792 · Filter by author ariostas opened on Oct 29, 2026

• RNTuple: arrays() reads an extra cluster when entry_stop is on a cluster boundary

  scikit-hep/uproot5#1786 · Filter by author ariostas opened on Oct 27, 2026

• RNTuple: arrays(how="zip") fails and numpy.asarray does not return an array

  bug (unverified)
  scikit-hep/uproot5#1782 · Filter by author aashirvad08 opened on Oct 26, 2026

• Deleting or replacing one cycle of a multi-cycle key in a writable file raises IndexError

  scikit-hep/uproot5#1778 · Filter by author JoeyTan21 opened on Oct 25, 2026

• Support add_branches for ROOT-written TTrees and jagged branches

  feature
  scikit-hep/uproot5#1764 · Filter by author ariostas opened on Oct 19, 2026

• Move ROOT metadata parsing to rootfilespec

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

• Support RNTuple attributes

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

• 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• awkward_pandas is outdated and AwkwardExtensionArray breaks HDF5 export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

• Implement expression support for RNTuples

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

• 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

• Incorrect writing of jagged arrays into a TTree

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

  

• Issue with reading custom classes in TTree branches

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

• Exception handling in uproot/source/coalesce.py

  bug (unverified)cleanup
  scikit-hep/uproot5#1450 · Filter by author zlmarshall opened on Jun 16, 2025
  1

• Reproducible ROOT files (kReproducible, ?reproducible)

  feature
  scikit-hep/uproot5#1445 · Filter by author maxfl opened on May 28, 2025

• Need tool to get dask dataframes from config files

  feature
  scikit-hep/uproot5#1441 · Filter by author acampove opened on May 18, 2025
  11

• Hide protected stuff from search results

  docs
  scikit-hep/uproot5#1440 · Filter by author acampove opened on May 18, 2025

• uproot 8 times slower to open many histograms

  bug (unverified)
  scikit-hep/uproot5#1417 · Filter by author wiso opened on Apr 12, 2025
  1

• RNTuple support

  feature
  scikit-hep/uproot5#1382 · Filter by author ariostas opened on Feb 17, 2025