holoviz/holoviews v1.22.0

Version 1.22.0

on GitHub

This release adds Narwhals support for broader dataframe compatibility. By doing so, we now also support Polars and DuckDB data backends.
Another new feature is the addition of sizebar support for Points elements, allowing for better visualization of point sizes in plots.
Along with these new features, this release includes numerous enhancements, bug fixes, compatibility updates, and improved documentation.
Many thanks to @epaaso (first contribution), @thuydotm (first contribution), @ahuang11, @Azaya89, @maximlt, @philippjfr, @stanwest, and @hoxbro for their contributions.

New Features:

• Support Narwhals (#6567, #6725)
• Add sizebar support to Point (#6663)

Enhancements:

• Add gridstyle to matplotlib (#6700)
• Add from_sparse classmethod for Graph (#6673)
• Add support for synthetic legends on ImageStackPlot (#6662)
• Sync tools with Bokeh and use auto_box_zoom as default (#6650)
• Add hover filter (#6646)
• Improve error message for non-matching types when aspect is set to equal (#6103)
• Use ImageStack as an element_type in rasterize (#6631)
• Improve core.util to work better without pandas installed (#6702)
• Implement link_selections.unlink (#6685)

Deprecations:

• Deprecate IbisInterface for NarwhalsInterface (#6718)

Performance:

• Optimize HeatMap rendering path if gridded and contiguous (#6680)
• Add debounce support to PlotSize and RangeXY Bokeh callbacks (#6672)
• Don't import IPython in find_stack_level (#6724)

Bug Fixes:

• Interpolation for Image with datashade (#6707)
• subcoordinate_y for DynamicMap if labels mismatched between plots (#6694)
• Setting selection_expr programmatically (#6689)
• Handle node_color in element transformations for Bokeh and MPL (#6678)
• hv.dim and hv.Dimension as color opts for Matplotlib Path plots (#6721, #6665)
• Use native bokeh x marker in plots and legends (#6676)
• Silence Bokeh FIXED_SIZING_MODE warning on hv.save (#6674)
• Comparison for non-numeric dtypes (#6671)
• Allow discovering .apply operation on pipeline (#6670)
• dendrogram edgecases (#6669)
• Don't select in decimate if start and end are the same (#6661)

Compatibility:

• Ibis 11.0.0 (#6706)
• Python 3.14 (#6704)
• xarray 2025.08 (#6664)
• cuDF 25.10 (#6659)
• Pillow 11.3.0 (#6651)