Update ModelingToolkit requirement from 10 to 10, 11.4 in the all-julia-packages group across 1 directory by dependabot[bot] · Pull Request #155 · SciML/CellMLToolkit.jl

dependabot · 2026-01-02T11:23:18Z

Updates the requirements on ModelingToolkit to permit the latest version.
Updates ModelingToolkit to 11.4.0

Release notes

Sourced from ModelingToolkit's releases.

v11.4.0

ModelingToolkit v11.4.0

Diff since v11.3.0

Merged pull requests:

fix: several bug fixes for inline linear SCCs (#4071) (@AayushSabharwal)

build: bump versions (#4072) (@AayushSabharwal)

Changelog

Sourced from ModelingToolkit's changelog.

ModelingToolkit v11 Release Notes

Symbolics@7 and SymbolicUtils@4 compatibility

SymbolicUtils version 4 involved a major overhaul of the core symbolic infrastructure, which propagated to Symbolics as Symbolics version 7. ModelingToolkit has now updated to these versions. This includes significant type-stability improvements, enabling precompilation of large parts of the symbolic infrastructure and faster TTFX. It is highly recommended to read the Release Notes for SymbolicUtils@4 and the doc page describing the new variant structure before these release notes.

As part of these changes, ModelingToolkit has changed how some data is represented to allow precompilation. Notably, variable => value mappings (such as guesses) are stored as an AbstractDict{SymbolicT, SymbolicT}. Here, SymbolicT is a type that comes from Symbolics.jl, and is the type for all unwrapped symbolic values. This means that any non-symbolic values are stored as SymbolicUtils.Const variants. Mutation such as guesses(sys)[x] = 1.0 is still possible, and values are automatically converted. However, obtaining the value back requires usage of SymbolicUtils.unwrap_const or Symbolics.value.

Following is a before/after comparison of the TTFX for the most common operations in ModelingToolkit.jl. Further improvements are ongoing. Note that the timings do depend on many factors such as the exact system used, types passed to constructor functions, other packages currently loaded in the session, presence of array variables/equations, whether index reduction is required, and the behavior of various passes in mtkcompile. However, the numbers are good representations of the kinds of performance improvements that are possible due to the new infrastructure. There will continue to be improvements as this gets more extensive testing and we are better able to identify bottlenecks in compilation.

System constructor

The time to call System, not including the time taken for @variables or building the equations.

Before:
  0.243758 seconds (563.80 k allocations: 30.613 MiB, 99.48% compilation time: 3% of which was recompilation)
elapsed time (ns):  2.43757958e8
gc time (ns):       0
bytes allocated:    32099616
pool allocs:        563137
non-pool GC allocs: 16
malloc() calls:     651
free() calls:       0
minor collections:  0
full collections:   0
After:
</tr></table> 

... (truncated)

Commits

9976e97 Merge pull request #4072 from SciML/as/bump-version
6fe953c build: bump MTKBase minor version
a4ecf56 build: bump minor version
4308dd9 Merge pull request #4071 from SciML/as/inline-linear-scc
0b19ef4 fix: fix simplification of optimization system
8eae438 test: avoid broken symbolic indexing syntax
4e01c9e feat: add initsys_mtkcompile_kwargs keyword for problem constructors
8e6a689 fix: handle API required by plotting
e19a539 feat: add copy for Schedule
3495217 refactor: update to new unhack_system
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dependabot · 2026-01-05T11:56:06Z