diff --git a/CHANGELOG.md b/CHANGELOG.md
index 69fd096d..715fc23e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 
 ## Bug Fixes
 
+
 - [#165](https://github.com/pybop-team/PyBOP/issues/165) - Stores the attempted and best parameter values and the best cost for each iteration in the log attribute of the optimiser and updates the associated plots.
 - [#354](https://github.com/pybop-team/PyBOP/issues/354) - Fixes the calculation of the gradient in the `RootMeanSquaredError` cost.
 - [#347](https://github.com/pybop-team/PyBOP/issues/347) - Resets options between MSMR tests to cope with a bug in PyBaMM v23.9 which is fixed in PyBaMM v24.1.
@@ -37,6 +38,15 @@
 - [#270](https://github.com/pybop-team/PyBOP/pull/270) - Updates PR template.
 - [#91](https://github.com/pybop-team/PyBOP/issues/91) - Adds a check on the number of parameters for CMAES and makes XNES the default optimiser.
 
+# [v24.3.1](https://github.com/pybop-team/PyBOP/tree/v24.3.1) - 2024-06-17
+
+## Features
+
+
+## Bug Fixes
+
+- [#369](https://github.com/pybop-team/PyBOP/pull/369) - Upper pins Numpy < 2.0 due to breaking Pints' functionality.
+
 # [v24.3](https://github.com/pybop-team/PyBOP/tree/v24.3) - 2024-03-25
 
 ## Features
diff --git a/CITATION.cff b/CITATION.cff
index 73dcce74..a14af062 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -11,5 +11,5 @@ authors:
     family-names: Courtier
   - given-names: David
     family-names: Howey
-version: "24.3" # Update this when you release a new version
+version: "24.3.1" # Update this when you release a new version
 repository-code: 'https://www.github.com/pybop-team/pybop'
diff --git a/pyproject.toml b/pyproject.toml
index 14ec41be..6d2e1b61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pybop"
-version = "24.3"
+version = "24.3.1"
 authors = [
   {name = "The PyBOP Team"},
 ]
@@ -27,7 +27,7 @@ classifiers = [
 requires-python = ">=3.9, <3.13"
 dependencies = [
   "pybamm>=23.9",
-  "numpy>=1.16",
+  "numpy>=1.16, <2.0",
   "scipy>=1.3",
   "pints>=0.5",
   "bpx>=0.4",
diff --git a/tests/plotting/test_plotly_manager.py b/tests/plotting/test_plotly_manager.py
index fc562ff2..80bc3bb5 100644
--- a/tests/plotting/test_plotly_manager.py
+++ b/tests/plotting/test_plotly_manager.py
@@ -1,6 +1,6 @@
 import subprocess
-from distutils.spawn import find_executable
 from importlib.metadata import distributions
+from shutil import which
 
 import numpy as np
 import plotly
@@ -10,7 +10,7 @@
 from pybop import PlotlyManager
 
 # Find the Python executable
-python_executable = find_executable("python")
+python_executable = which("python")
 
 
 @pytest.fixture(scope="session")