diff --git a/noxfile.py b/noxfile.py
index 5ab32f463f..232397deb5 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -252,9 +252,11 @@ def run_tests(session):
     set_environment_variables(PYBAMM_ENV, session=session)
     session.install("setuptools", silent=False)
     session.install("-e", ".[all,dev,jax]", silent=False)
-    specific_test_files = session.posargs if session.posargs else []
     session.run(
-        "python", "-m", "pytest", *specific_test_files, "-m", "unit or integration"
+        "python",
+        "-m",
+        "pytest",
+        *(session.posargs if session.posargs else ["-m", "unit or integration"]),
     )
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 1002b86cc0..b54bdcc1e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,8 @@ dependencies = [
     "pandas>=1.5.0",
     "pooch>=1.8.1",
     "posthog",
+    "pyyaml",
+    "platformdirs",
 ]
 
 [project.urls]