# graphviz 16.0.0

- Product: graphviz (https://whatsnew.fyi/product/graphviz)
- Vendor: graphviz
- Date: 2026-08-14
- Version: 16.0.0
- Original notes: https://gitlab.com/graphviz/graphviz/-/tags/16.0.0
- Permalink: https://whatsnew.fyi/product/graphviz/releases/16.0.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

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See the CHANGELOG .

- **added** — A new agnnodes_z function is available as an alternative to agnnodes
- **changed** — The core plugin's JSON renderer no longer overwrites the graph's IO discipline
- **removed** — The agmemconcat function has been removed
- **removed** — Support for the undocumented postaction attribute has been removed
- **changed** — gvmap discards cluster attribute information if any cluster attribute has a negative value
- **removed** — The gvmap options -g, -l, and -p have been removed
- **changed** — xdot_linear_grad.n_stops and xdot_radial_grad.n_stops are now of type unsigned
- **fixed** — Rendering multiple graphs with the core plugin's FIG renderer no longer results in later outputs referring to colors defined in earlier outputs
- **fixed** — libxdot rejects parsing of linear and radial gradients that claim a negative number of stops
- **fixed** — Graphs that require top sorting during crossing minimization no longer cause Graphviz to crash
- **fixed** — Fixed infinite loop in gvpr by making object traversals skip newly created objects in mutable graphs

###### Added

- A new `agnnodes_z` function is available as an alternative to `agnnodes`. This
  new function should be preferred in new code.

###### Changed

- The core plugin’s JSON renderer no longer overwrites the graph’s IO
  discipline. This will only be relevant to users writing their own plugin-using
  code.
- **Breaking**: The `agmemconcat` function has been removed.
- **Breaking**: Support for the undocumented `postaction` attribute has been
  removed.
- `gvmap` discards `cluster` attribute information if any `cluster` attribute
  has a negative value. This should never occur in normal operation (the
  `cluster` program only attaches non-negative `cluster` attributes), but only
  if a user has incorrectly edited dot source.
- **Breaking**: The `gvmap` options `-g`, `-l`,  and `-p` have been removed.
  Their functionality was never implemented and passing these had no effect.
- **Breaking**: `xdot_linear_grad.n_stops` and `xdot_radial_grad.n_stops` are
  now of type `unsigned`.

###### Fixed

- Rendering multiple graphs with the core plugin’s FIG renderer no longer
  results in later outputs referring to colors defined in earlier outputs.
- libxdot rejects parsing of linear and radial gradients that claim a negative
  number of stops.
- Graphs that require “top sorting” during crossing minimization no longer cause
  Graphviz to crash. This was a regression in Graphviz 14.1.3. #2851
- Fixed infinite loop in gvpr #2849 by making object traversals skip newly
  created objects in mutable graphs. To do this, added API to get current object
  sequence numbers.