diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2a453c15..94800d008 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,15 @@
 
 ## Bug Fixes
 
+# [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 11ce822fd..a14af062e 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -11,5 +11,5 @@ authors:
     family-names: Courtier
   - given-names: David
     family-names: Howey
-version: "23.12" # 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 17fbf7b71..20c1e73bb 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"},
 ]
@@ -19,7 +19,7 @@ classifiers = []
 requires-python = ">=3.8, <3.13"
 dependencies = [
   "pybamm>=23.5",
-  "numpy>=1.16",
+  "numpy>=1.16, <2.0",
   "scipy>=1.3",
   "pints>=0.5",
 ]
diff --git a/tests/plotting/test_plotly_manager.py b/tests/plotting/test_plotly_manager.py
index fc562ff2f..80bc3bb58 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")