diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fec0546d..01f58e8a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,15 +10,19 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.14']
+      fail-fast: false
 
     steps:
     - name: Checkout code
       uses: actions/checkout@v4
 
-    - name: Set up Python
+    - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:
-        python-version: '3.9'
+        python-version: ${{ matrix.python-version }}
 
     - name: Install uv
       uses: astral-sh/setup-uv@v5
diff --git a/kmos/types.py b/kmos/types.py
index 59167f10..7acc6afd 100644
--- a/kmos/types.py
+++ b/kmos/types.py
@@ -2156,7 +2156,10 @@ def prettify_xml(elem):
     sort_xml_attributes(elem)
     rough_string = ET.tostring(elem, encoding='utf-8')
     reparsed = minidom.parseString(rough_string)
-    return reparsed.toprettyxml(indent='    ')
+    pretty_xml = reparsed.toprettyxml(indent='    ')
+    # Unescape 
 to newlines for consistency across Python versions
+    # (Python >= 3.14 escapes newlines in attributes, older versions don't)
+    return pretty_xml.replace('
', '\n')
 
 
 def parse_chemical_expression(eq, process, project_tree):
diff --git a/kmos/utils/__init__.py b/kmos/utils/__init__.py
index b3f7efe6..4e08a836 100644
--- a/kmos/utils/__init__.py
+++ b/kmos/utils/__init__.py
@@ -388,21 +388,28 @@ def build(options):
 
     extra_flags = {}
 
+    # Add include path for src directory (needed for meson backend in Python >= 3.12)
+    # Use absolute path so meson can find include files from its temp build directory
+    if os.path.isdir('src'):
+        src_include = '-I' + os.path.abspath('src')
+    else:
+        src_include = '-I' + os.path.abspath('.')
+
     if options.no_optimize:
         extra_flags['gfortran'] = ('-ffree-line-length-0 -ffree-form'
                                    ' -xf95-cpp-input -Wall -fimplicit-none'
-                                   ' -time  -fmax-identifier-length=63')
+                                   ' -time  -fmax-identifier-length=63 ' + src_include)
         extra_flags['gnu95'] = extra_flags['gfortran']
-        extra_flags['intel'] = '-fpp -Wall -I/opt/intel/fc/10.1.018/lib'
-        extra_flags['intelem'] = '-fpp -Wall'
+        extra_flags['intel'] = '-fpp -Wall -I/opt/intel/fc/10.1.018/lib ' + src_include
+        extra_flags['intelem'] = '-fpp -Wall ' + src_include
 
     else:
         extra_flags['gfortran'] = ('-ffree-line-length-0 -ffree-form'
                                    ' -xf95-cpp-input -Wall -O3 -fimplicit-none'
-                                   ' -time -fmax-identifier-length=63')
+                                   ' -time -fmax-identifier-length=63 ' + src_include)
         extra_flags['gnu95'] = extra_flags['gfortran']
-        extra_flags['intel'] = '-fast -fpp -Wall -I/opt/intel/fc/10.1.018/lib'
-        extra_flags['intelem'] = '-fast -fpp -Wall'
+        extra_flags['intel'] = '-fast -fpp -Wall -I/opt/intel/fc/10.1.018/lib ' + src_include
+        extra_flags['intelem'] = '-fast -fpp -Wall ' + src_include
 
     # FIXME
     extra_libs = ''
@@ -444,6 +451,14 @@ def build(options):
     from numpy import f2py
     sys.argv = call
     os.environ["LIBRARY_PATH"] = os.environ.get("LIBRARY_PATH", "") + ":/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib"
+
+    # Set FC for meson backend (Python >= 3.12) to compiler name only
+    # Meson has issues with FC containing full paths
+    if sys.version_info >= (3, 12):
+        fc_map = {'gfortran': 'gfortran', 'gnu95': 'gfortran', 'intel': 'ifort', 'intelem': 'ifort'}
+        if options.fcompiler in fc_map:
+            os.environ['FC'] = fc_map[options.fcompiler]
+
     f2py.main()
     sys.argv = true_argv
 
diff --git a/pyproject.toml b/pyproject.toml
index 70fb0bcc..021ca146 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "kmos"
-version = "0.4.1"  # Managed by bump-my-version
+version = "0.4.2"  # Managed by bump-my-version
 description = "kMC modeling on steroids"
 readme = "README.md"
 requires-python = ">=3.9"
@@ -31,6 +31,8 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Education",
     "Topic :: Scientific/Engineering :: Chemistry",
     "Topic :: Scientific/Engineering :: Physics",
@@ -42,6 +44,8 @@ dependencies = [
     "lxml",
     "numpy>=2.0.2",
     "pytest>=8.4.2",
+    "meson>=1.2.0",
+    "meson-python>=0.15.0",
 ]
 
 [project.urls]
@@ -76,7 +80,7 @@ kmos = [
 # Example: PYTHONPATH=. uv run pytest tests/
 
 [tool.bumpversion]
-current_version = "0.4.1"
+current_version = "0.4.2"
 parse = "(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)"
 serialize = ["{major}.{minor}.{patch}"]
 search = "{current_version}"