Release v25.12.1 (#5359)

Co-authored-by: Marc Berliner <34451391+MarcBerliner@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Robert Timms <43040151+rtimms@users.noreply.github.com>

Author: 4 people

CHANGELOG.md

@@ -2,11 +2,18 @@
 
 ## Features
 
-- Improve the robustness of the `ElectrodeSOHComposite` model and ensure the calculation of equilibrium stoichiometries is consistent for models with hysteresis. ([#5347](https://github.com/pybamm-team/PyBaMM/pull/5347))
 - Improve the performance of matrix multiplication with CasADi expressions. ([#5351](https://github.com/pybamm-team/PyBaMM/pull/5351))
 
 ## Bug fixes
 
+# [v25.12.1](https://github.com/pybamm-team/PyBaMM/tree/v25.12.1) - 2026-01-21
+
+## Features
+
+- Improve the robustness of the `ElectrodeSOHComposite` model and ensure the calculation of equilibrium stoichiometries is consistent for models with hysteresis. ([#5347](https://github.com/pybamm-team/PyBaMM/pull/5347))
+
+## Bug fixes
+
 - Fixed a bug where `ExpressionFunctionParameter` children were not properly substituted after JSON deserialization, causing `ElectrodeSOHSolver` to fail with "Variable not implemented" errors. ([#5352](https://github.com/pybamm-team/PyBaMM/pull/5352))
 
 # [v25.12.0](https://github.com/pybamm-team/PyBaMM/tree/v25.12.0) - 2026-01-15

CITATION.cff

@@ -24,6 +24,6 @@ keywords:
   - "expression tree"
   - "python"
   - "symbolic differentiation"
-version: "25.12.0"
+version: "25.12.1"
 repository-code: "https://github.com/pybamm-team/PyBaMM"
 title: "Python Battery Mathematical Modelling (PyBaMM)"