diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e405dfa2a..f6a0bf6ff 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -377,9 +377,6 @@ jobs:
           path: dist
       - name: Upgrade pip
         run: python3 -m pip install -U pip setuptools wheel
-      - name: Install typing_extensions for Python 3.7
-        if: matrix.python-version == '3.7'
-        run: python3 -m pip install typing-extensions
       - name: Install Python dependencies
         run: |
             python3 -m pip install numpy ruamel.yaml h5py pandas matplotlib scipy pint
diff --git a/interfaces/python_sdist/MANIFEST.in b/interfaces/python_sdist/MANIFEST.in
index dc998757e..9b1ae04f4 100644
--- a/interfaces/python_sdist/MANIFEST.in
+++ b/interfaces/python_sdist/MANIFEST.in
@@ -3,7 +3,6 @@
 # listed in setup.cfg:options.exclude_package_data.
 
 include cantera/_cantera.cpp
-include cantera/_cantera.h
 recursive-include cantera *.pyx
 include sundials_config.h.in
 include config.h.in
diff --git a/interfaces/python_sdist/SConscript b/interfaces/python_sdist/SConscript
index 0c673ed87..85ac5644c 100644
--- a/interfaces/python_sdist/SConscript
+++ b/interfaces/python_sdist/SConscript
@@ -170,8 +170,6 @@ sdist(localenv.RecursiveInstall("cantera",
                                 exclude=["__pycache__"]))
 sdist(localenv.RecursiveInstall("cantera/data",
                                 "#build/data"))
-sdist(localenv.RecursiveInstall("cantera/test/data",
-                                "#test/data"))
 
 # Copy the minimal Sundials configuration template into the sdist so that
 # it can be filled in at compile time on the user's machine
diff --git a/interfaces/python_sdist/pyproject.toml b/interfaces/python_sdist/pyproject.toml
index a272bb956..1bb9493c6 100644
--- a/interfaces/python_sdist/pyproject.toml
+++ b/interfaces/python_sdist/pyproject.toml
@@ -1,3 +1,10 @@
 [build-system]
-requires = ["setuptools>=43.0.0", "wheel", "oldest-supported-numpy", "Cython>=0.29.12"]
+# These versions are pinned to the latest versions at the time of this commit.
+# Feel free to update as required.
+requires = [
+  "setuptools==67.7.1",
+  "wheel",
+  "oldest-supported-numpy",
+  "Cython==0.29.34",
+]
 build-backend = "setuptools.build_meta"
diff --git a/interfaces/python_sdist/setup.cfg.in b/interfaces/python_sdist/setup.cfg.in
index 89ec6775a..77aa5557b 100644
--- a/interfaces/python_sdist/setup.cfg.in
+++ b/interfaces/python_sdist/setup.cfg.in
@@ -45,15 +45,19 @@ install_requires =
     packaging
 python_requires @py_requires_ver_str@
 packages =
-    cantera
     cantera.data
+    cantera.examples
+    cantera.test
+    cantera.with_units
 
 # These options include data in the sdist and wheel if the files are also listed in
 # MANIFEST.in. Note that only files that are inside the "cantera" packages will be
 # included in the wheel.
 [options.package_data]
-cantera.data = *.*, */*.*
-cantera = *.pxd, test/*.txt, examples/*.txt
+cantera = *.pxd
+cantera.data = *.*
+cantera.examples = *.txt
+cantera.test = *.txt
 
 # These options exclude data from the wheel file but not from the sdist
 [options.exclude_package_data]
diff --git a/interfaces/python_sdist/setup.py b/interfaces/python_sdist/setup.py
index 705d2608f..127297a17 100644
--- a/interfaces/python_sdist/setup.py
+++ b/interfaces/python_sdist/setup.py
@@ -8,14 +8,13 @@ from pathlib import Path
 import numpy
 import shutil
 
-HERE = Path(__file__).parent
-CT_SRC = HERE / "src"
-EXT_SRC = HERE / "ext"
-CT_INCLUDE = HERE / "include"
+CT_SRC = Path("src")
+EXT_SRC = Path("ext")
+CT_INCLUDE = Path("include")
 BOOST_INCLUDE = None
 FORCE_CYTHON_COMPILE = False
 
-CYTHON_BUILT_FILES = [HERE / "cantera" / f"_cantera.{ext}" for ext in ("cpp", "h")]
+CYTHON_BUILT_FILES = [Path("cantera") / f"_cantera.{ext}" for ext in ("cpp", "h")]
 
 
 class CanteraOptionsMixin:
@@ -114,9 +113,6 @@ def configure_build():
 
     config_h = {}
 
-    def create_config(key, value):
-        config_h[key] = f"#define {key} {value}"
-
     if not boost_version:
         raise ValueError(
             "Could not find Boost headers. Please set an environment variable called "
@@ -134,7 +130,7 @@ def configure_build():
         )
 
     if sys.platform != "win32":
-        extra_compile_flags = ["-std=c++14", "-g0"]
+        extra_compile_flags = ["-std=c++17", "-g0"]
         sundials_configh = {
             "SUNDIALS_USE_GENERIC_MATH": "#define SUNDIALS_USE_GENERIC_MATH 1",
             "SUNDIALS_BLAS_LAPACK": "/* #undef SUNDIALS_BLAS_LAPACK */"
@@ -150,14 +146,14 @@ def configure_build():
         }
         sundials_cflags = []
 
-    sun_config_h_in = (HERE / "sundials_config.h.in").read_text()
-    sun_config_h = HERE / "sundials_config.h"
+    sun_config_h_in = Path("sundials_config.h.in").read_text()
+    sun_config_h = Path("sundials_config.h")
     sun_config_h.write_text(sun_config_h_in.format_map(sundials_configh))
     shutil.copy2(sun_config_h, EXT_SRC / "sundials" / "sundials")
     shutil.copy2(sun_config_h, CT_INCLUDE / "cantera" / "ext" / "sundials")
 
-    config_h_in = (HERE / "config.h.in").read_text()
-    ct_config_h = HERE / "include" / "cantera" / "base" / "config.h"
+    config_h_in = Path("config.h.in").read_text()
+    ct_config_h = Path("include") / "cantera" / "base" / "config.h"
     ct_config_h.write_text(config_h_in.format_map(config_h))
 
     return extra_compile_flags, sundials_cflags, sundials_macros
diff --git a/site_scons/buildutils.py b/site_scons/buildutils.py
index 1b560e833..601653338 100644
--- a/site_scons/buildutils.py
+++ b/site_scons/buildutils.py
@@ -2,7 +2,6 @@ from __future__ import annotations
 import json
 import os
 import sys
-import platform
 import textwrap
 import re
 import subprocess