diff --git a/.gitignore b/.gitignore
index 36dfbbb..92cc732 100644
--- a/.gitignore
+++ b/.gitignore
@@ -64,6 +64,8 @@ subprojects/yaml-cpp/
 subprojects/quill/
 subprojects/googletest-1.15.2/
 subprojects/opat-core/
+subprojects/pybind11*/
+subprojects/packagecache/
 
 .vscode/
 
diff --git a/assets/static/atomic/include/atomicSpecies.h b/assets/static/atomic/include/atomicSpecies.h
index 64c6596..be265b3 100644
--- a/assets/static/atomic/include/atomicSpecies.h
+++ b/assets/static/atomic/include/atomicSpecies.h
@@ -1,5 +1,4 @@
-#ifndef SPECIES_MASS_DATA_H
-#define SPECIES_MASS_DATA_H
+#pragma once
 #include <unordered_map>
 #include <string_view>
 #include <string>
@@ -7205,4 +7204,3 @@ namespace chemSpecies {
         {"Og-295", Og_295},
     };
 }; // namespace chemSpecies
-#endif // SPECIES_MASS_DATA_H
diff --git a/build-config/meson.build b/build-config/meson.build
index f7f6466..be2adc5 100644
--- a/build-config/meson.build
+++ b/build-config/meson.build
@@ -5,3 +5,17 @@ subdir('yaml-cpp')
 subdir('quill')
 subdir('boost')
 subdir('opatIO')
+subdir('pybind')
+
+# Set the config file error handling options
+configErr = get_option('config_error_handling')
+
+# build up any -D flags we need
+commonCppArgs = []
+if configErr == 'warn'
+    commonCppArgs += ['-DCONFIG_WARN']
+elif configErr == 'harsh'
+    commonCppArgs += ['-DCONFIG_HARSH']
+endif
+
+add_project_arguments(commonCppArgs, language: 'cpp')
\ No newline at end of file
diff --git a/build-config/mfem/meson.build b/build-config/mfem/meson.build
index a642f0e..560f6ab 100644
--- a/build-config/mfem/meson.build
+++ b/build-config/mfem/meson.build
@@ -4,10 +4,11 @@ mfem_cmake_options.add_cmake_defines({
     'MFEM_ENABLE_TESTING': 'OFF',
     'MFEM_ENABLE_MINIAPPS': 'OFF',
     'MFEM_USE_BENCMARK': 'OFF',
+    'BUILD_SHARED_LIBS': 'ON',
+    'CMAKE_SKIP_INSTALL_RULES': 'ON'
 })
 
 mfem_sp = cmake.subproject(
     'mfem',
     options: mfem_cmake_options)
 mfem_dep = mfem_sp.dependency('mfem')
-add_project_arguments('-I' + meson.current_build_dir() + '/subprojects/mfem/__CMake_build/config', language: 'cpp')
diff --git a/build-config/pybind/meson.build b/build-config/pybind/meson.build
new file mode 100644
index 0000000..94888e1
--- /dev/null
+++ b/build-config/pybind/meson.build
@@ -0,0 +1,5 @@
+if get_option('build_python')
+    pybind11_proj = subproject('pybind11')
+    pybind11_dep = pybind11_proj.get_variable('pybind11_dep')
+    python3_dep = dependency('python3')
+endif
\ No newline at end of file
diff --git a/build-config/quill/meson.build b/build-config/quill/meson.build
index 3c5a89d..a069255 100644
--- a/build-config/quill/meson.build
+++ b/build-config/quill/meson.build
@@ -1,5 +1,10 @@
+quill_cmake_options = cmake.subproject_options()
+quill_cmake_options.add_cmake_defines({
+                                     'BUILD_SHARED_LIBS': 'ON',
+                                     'CMAKE_SKIP_INSTALL_RULES': 'ON'
+})
 quill_sp = cmake.subproject(
-    'quill'
+    'quill',
+    options: quill_cmake_options,
 )
-quill_dep = quill_sp.dependency('quill')
-add_project_arguments('-I' + meson.current_build_dir() + '/subprojects/quill/__CMake_build', language: 'cpp')
\ No newline at end of file
+quill_dep = quill_sp.dependency('quill')
\ No newline at end of file
diff --git a/build-config/yaml-cpp/meson.build b/build-config/yaml-cpp/meson.build
index 27c9332..8a81a82 100644
--- a/build-config/yaml-cpp/meson.build
+++ b/build-config/yaml-cpp/meson.build
@@ -1,10 +1,11 @@
 yaml_cpp_cmake_options = cmake.subproject_options()
 yaml_cpp_cmake_options.add_cmake_defines({
- 'CMAKE_POLICY_VERSION_MINIMUM': '3.5'
+ 'CMAKE_POLICY_VERSION_MINIMUM': '3.5',
+ 'BUILD_SHARED_LIBS': 'ON',
+ 'CMAKE_SKIP_INSTALL_RULES': 'ON'
 })
 yaml_cpp_sp = cmake.subproject(
     'yaml-cpp',
     options: yaml_cpp_cmake_options,
 )
-yaml_cpp_dep = yaml_cpp_sp.dependency('yaml-cpp')
-add_project_arguments('-I' + meson.current_build_dir() + '/subprojects/yaml-cpp/__CMake_build', language: 'cpp')
\ No newline at end of file
+yaml_cpp_dep = yaml_cpp_sp.dependency('yaml-cpp')
\ No newline at end of file
diff --git a/build-python/meson.build b/build-python/meson.build
new file mode 100644
index 0000000..bd87563
--- /dev/null
+++ b/build-python/meson.build
@@ -0,0 +1,17 @@
+# --- Python Extension Setup ---
+py_installation = import('python').find_installation('python3')
+
+py_mod = py_installation.extension_module(
+    'fourdsse_bindings', # Name of the generated .so/.pyd file (without extension)
+    sources: [
+        meson.project_source_root() + '/src/python/composition/bindings.cpp',
+    ],
+    dependencies : [
+        pybind11_dep,
+        composition_dep,
+        species_weight_dep
+    ],
+    cpp_args : ['-UNDEBUG'], # Example: Ensure assertions are enabled if needed
+    install : true,
+    subdir: 'fourdstar' # Optional: Install the module inside a 'fourdsse' Python package directory
+)
\ No newline at end of file
diff --git a/meson.build b/meson.build
index b654bc3..5fb3b51 100644
--- a/meson.build
+++ b/meson.build
@@ -28,3 +28,7 @@ subdir('src')
 if get_option('build_tests')
     subdir('tests')
 endif
+
+if get_option('build_python')
+    subdir('build-python')
+endif
\ No newline at end of file
diff --git a/meson_options.txt b/meson_options.txt
index 56baeee..cc87109 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,2 +1,10 @@
 option('build_tests', type: 'boolean', value: true, description: 'Build tests')
 option('user_mode', type: 'boolean', value: false, description: 'Enable user mode (set mode = 0)')
+option('build_python', type: 'boolean', value: true, description: 'Build Python bindings')
+option(
+    'config_error_handling',
+    type: 'combo',
+    choices: [ 'none', 'warn', 'harsh' ],
+    value: 'none',
+    description: 'What to do if a config file fails to load: silent (none), warning (warn), or error (harsh)'
+)
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..1ebe206
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,21 @@
+[build-system]
+requires = [
+    "meson-python>=0.15.0", # Use a recent version
+    "meson>=1.6.0",        # Specify your Meson version requirement
+    "pybind11>=2.10"       # pybind11 headers needed at build time
+]
+build-backend = "mesonpy"
+
+[project]
+name = "fourdstar"  # Choose your Python package name
+version = "0.1.0" # Your project's version
+description = "Python interface for the 4DSSE C++ project"
+readme = "Readme.md"
+license = { file = "LICENSE.txt" } # Reference your license file [cite: 2]
+
+authors = [
+    {name = "Emily M. Boudreaux", email = "emily@boudreauxmail.com"},
+]
+maintainers = [
+    {name = "Emily M. Boudreaux", email = "emily@boudreauxmail.com"}
+]
\ No newline at end of file
diff --git a/src/composition/meson.build b/src/composition/meson.build
index 8b297b4..fe928d8 100644
--- a/src/composition/meson.build
+++ b/src/composition/meson.build
@@ -9,13 +9,12 @@ composition_headers = files(
 
 dependencies = [
     probe_dep,
-    config_dep,
     quill_dep,
     species_weight_dep
 ]
 
 # Define the libcomposition library so it can be linked against by other parts of the build system
-libcomposition = static_library('composition',
+libcomposition = library('composition',
     composition_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/src/composition/public/composition.h b/src/composition/public/composition.h
index 30c61fc..94e644b 100644
--- a/src/composition/public/composition.h
+++ b/src/composition/public/composition.h
@@ -190,7 +190,6 @@ namespace composition{
      */
     class Composition {
     private:
-        Config& m_config = Config::getInstance();
         Probe::LogManager& m_logManager = Probe::LogManager::getInstance();
         quill::Logger* m_logger = m_logManager.getLogger("log");
 
diff --git a/src/config/meson.build b/src/config/meson.build
index 289b086..f51e06c 100644
--- a/src/config/meson.build
+++ b/src/config/meson.build
@@ -8,7 +8,7 @@ config_headers = files(
 )
 
 # Define the libconfig library so it can be linked against by other parts of the build system
-libconfig = static_library('config',
+libconfig = library('config',
     config_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/src/config/public/config.h b/src/config/public/config.h
index be33163..33a901c 100644
--- a/src/config/public/config.h
+++ b/src/config/public/config.h
@@ -156,7 +156,12 @@ public:
    template <typename T>
    T get(const std::string &key, T defaultValue) {
       if (!m_loaded) {
-         throw std::runtime_error("Error! Config file not loaded");
+// ONLY THROW ERROR IF HARSH OR WARN CONFIGURATION
+#if defined(CONFIG_HARSH)
+         throw std::runtime_error("Error! Config file not loaded. To disable this error, recompile with CONFIG_HARSH=0");
+#elif defined(CONFIG_WARN)
+         std::cerr << "Warning! Config file not loaded. This instance of 4DSSE was compiled with CONFIG_WARN so the code will continue using only default values" << std::endl;
+#endif
       }
       // --- Check if the key has already been checked for existence 
       if (std::find(unknownKeys.begin(), unknownKeys.end(), key) != unknownKeys.end()) {
diff --git a/src/eos/meson.build b/src/eos/meson.build
index f9979b4..f7abb67 100644
--- a/src/eos/meson.build
+++ b/src/eos/meson.build
@@ -18,7 +18,7 @@ dependencies = [
     macros_dep,
 ]
 # Define the libconst library so it can be linked against by other parts of the build system
-libeos = static_library('eos',
+libeos = library('eos',
     eos_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/src/meshIO/meson.build b/src/meshIO/meson.build
index a684138..cc4faa7 100644
--- a/src/meshIO/meson.build
+++ b/src/meshIO/meson.build
@@ -10,7 +10,7 @@ dependencies = [
     mfem_dep
 ]
 # Define the libmeshIO library so it can be linked against by other parts of the build system
-libmeshIO = static_library('meshIO',
+libmeshIO = library('meshIO',
     meshIO_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/src/meson.build b/src/meson.build
index 2946320..280c34a 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -23,3 +23,6 @@ subdir('resource')
 # Physics Libraries
 subdir('network')
 subdir('poly')
+
+# Python Bindings
+subdir('python')
diff --git a/src/network/meson.build b/src/network/meson.build
index 2add636..41abf3f 100644
--- a/src/network/meson.build
+++ b/src/network/meson.build
@@ -19,7 +19,7 @@ dependencies = [
 ]
 
 # Define the libnetwork library so it can be linked against by other parts of the build system
-libnetwork = static_library('network',
+libnetwork = library('network',
     network_sources, 
     include_directories: include_directories('public'),
     dependencies: dependencies,
diff --git a/src/poly/utils/meson.build b/src/poly/utils/meson.build
index 9b73678..0b94b21 100644
--- a/src/poly/utils/meson.build
+++ b/src/poly/utils/meson.build
@@ -32,7 +32,7 @@ dependencies = [
   types_dep,
 ]
 
-libpolyutils = static_library('polyutils',
+libpolyutils = library('polyutils',
   polyutils_sources,
   include_directories : include_directories('./public'),
   cpp_args: ['-fvisibility=default'],
diff --git a/src/probe/meson.build b/src/probe/meson.build
index cf6accf..186586b 100644
--- a/src/probe/meson.build
+++ b/src/probe/meson.build
@@ -35,7 +35,7 @@ dependencies = [
 ]
 
 # Define the liblogger library so it can be linked against by other parts of the build system
-libprobe = static_library('probe',
+libprobe = library('probe',
     probe_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/src/python/composition/bindings.cpp b/src/python/composition/bindings.cpp
new file mode 100644
index 0000000..8658fc6
--- /dev/null
+++ b/src/python/composition/bindings.cpp
@@ -0,0 +1,162 @@
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h> // Needed for vectors, maps, sets, strings
+#include <pybind11/stl_bind.h> // Needed for binding std::vector, std::map etc if needed directly
+
+#include <string>
+
+#include "composition.h"
+#include "atomicSpecies.h"
+
+namespace py = pybind11;
+
+std::string sv_to_string(std::string_view sv) {
+    return std::string(sv);
+}
+
+std::string get_ostream_str(const composition::Composition& comp) {
+     std::ostringstream oss;
+     oss << comp;
+     return oss.str();
+}
+
+PYBIND11_MODULE(fourdsse_bindings, m) { // Module name must match meson.build
+    m.doc() = "Python bindings for the 4DSSE project"; // Optional module docstring
+
+    auto comp_submodule = m.def_submodule("composition", "Bindings for the Composition module");
+    auto chem_submodule = m.def_submodule("species", "Bindings for the Chemical Species module");
+
+    // --- Bindings for composition and species module ---
+    py::class_<composition::GlobalComposition>(comp_submodule, "GlobalComposition")
+        .def_readonly("specificNumberDensity", &composition::GlobalComposition::specificNumberDensity)
+        .def_readonly("meanParticleMass", &composition::GlobalComposition::meanParticleMass)
+        .def("__repr__", // Add a string representation for easy printing in Python
+             [](const composition::GlobalComposition &gc) {
+                 return "<GlobalComposition(specNumDens=" + std::to_string(gc.specificNumberDensity) +
+                        ", meanMass=" + std::to_string(gc.meanParticleMass) + ")>";
+             });
+
+    py::class_<composition::CompositionEntry>(comp_submodule, "CompositionEntry")
+        .def("symbol", &composition::CompositionEntry::symbol)
+        .def("mass_fraction",
+             py::overload_cast<>(&composition::CompositionEntry::mass_fraction, py::const_),
+             "Gets the mass fraction of the species.")
+        .def("mass_fraction",
+             py::overload_cast<double>(&composition::CompositionEntry::mass_fraction, py::const_),
+             py::arg("meanMolarMass"), // Name the argument in Python
+             "Gets the mass fraction of the species given the mean molar mass.")
+        .def("number_fraction",
+              py::overload_cast<>(&composition::CompositionEntry::number_fraction, py::const_),
+              "Gets the number fraction of the species.")
+        .def("number_fraction",
+              py::overload_cast<double>(&composition::CompositionEntry::number_fraction, py::const_),
+              py::arg("totalMoles"),
+              "Gets the number fraction of the species given the total moles.")
+
+        .def("rel_abundance", &composition::CompositionEntry::rel_abundance)
+        .def("isotope", &composition::CompositionEntry::isotope) // Assuming Species is bound or convertible
+        .def("getMassFracMode", &composition::CompositionEntry::getMassFracMode)
+
+        .def("__repr__", // Optional: nice string representation
+            [](const composition::CompositionEntry &ce) {
+                // You might want to include more info here now
+                return "<CompositionEntry(symbol='" + ce.symbol() + "', " +
+                    "mass_frac=" + std::to_string(ce.mass_fraction()) + ", " +
+                    "num_frac=" + std::to_string(ce.number_fraction()) + ")>";
+            });
+
+        // --- Binding for the main Composition class ---
+    py::class_<composition::Composition>(comp_submodule, "Composition")
+        // Constructors
+        .def(py::init<>(), "Default constructor")
+        .def(py::init<const std::vector<std::string>&>(),
+             py::arg("symbols"),
+             "Constructor taking a list of symbols to register (defaults to mass fraction mode)")
+        // .def(py::init<const std::set<std::string>&>(), py::arg("symbols")) // Binding std::set constructor is possible but often less convenient from Python
+        .def(py::init<const std::vector<std::string>&, const std::vector<double>&, bool>(),
+             py::arg("symbols"), py::arg("fractions"), py::arg("massFracMode") = true,
+             "Constructor taking symbols, fractions, and mode (True=Mass, False=Number)")
+
+        // Methods
+        .def("finalize", &composition::Composition::finalize, py::arg("norm") = false,
+             "Finalize the composition, optionally normalizing fractions to sum to 1.")
+
+        .def("registerSymbol", py::overload_cast<const std::string&, bool>(&composition::Composition::registerSymbol),
+             py::arg("symbol"), py::arg("massFracMode") = true, "Register a single symbol.")
+        .def("registerSymbol", py::overload_cast<const std::vector<std::string>&, bool>(&composition::Composition::registerSymbol),
+             py::arg("symbols"), py::arg("massFracMode") = true, "Register multiple symbols.")
+
+        .def("getRegisteredSymbols", &composition::Composition::getRegisteredSymbols,
+             "Get the set of registered symbols.")
+
+        .def("setMassFraction", py::overload_cast<const std::string&, const double&>(&composition::Composition::setMassFraction),
+             py::arg("symbol"), py::arg("mass_fraction"), "Set mass fraction for a single symbol (requires massFracMode). Returns old value.")
+        .def("setMassFraction", py::overload_cast<const std::vector<std::string>&, const std::vector<double>&>(&composition::Composition::setMassFraction),
+             py::arg("symbols"), py::arg("mass_fractions"), "Set mass fractions for multiple symbols (requires massFracMode). Returns list of old values.")
+
+        .def("setNumberFraction", py::overload_cast<const std::string&, const double&>(&composition::Composition::setNumberFraction),
+             py::arg("symbol"), py::arg("number_fraction"), "Set number fraction for a single symbol (requires !massFracMode). Returns old value.")
+        .def("setNumberFraction", py::overload_cast<const std::vector<std::string>&, const std::vector<double>&>(&composition::Composition::setNumberFraction),
+             py::arg("symbols"), py::arg("number_fractions"), "Set number fractions for multiple symbols (requires !massFracMode). Returns list of old values.")
+
+        .def("mix", &composition::Composition::mix, py::arg("other"), py::arg("fraction"),
+             "Mix with another composition. Returns new Composition.")
+
+        .def("getMassFraction", py::overload_cast<const std::string&>(&composition::Composition::getMassFraction, py::const_),
+             py::arg("symbol"), "Get mass fraction for a symbol (calculates if needed). Requires finalization.")
+        .def("getMassFraction", py::overload_cast<>(&composition::Composition::getMassFraction, py::const_),
+             "Get dictionary of all mass fractions. Requires finalization.")
+
+        .def("getNumberFraction", py::overload_cast<const std::string&>(&composition::Composition::getNumberFraction, py::const_),
+             py::arg("symbol"), "Get number fraction for a symbol (calculates if needed). Requires finalization.")
+        .def("getNumberFraction", py::overload_cast<>(&composition::Composition::getNumberFraction, py::const_),
+             "Get dictionary of all number fractions. Requires finalization.")
+
+        // Note: pybind11 automatically converts std::pair to a Python tuple
+        .def("getComposition", py::overload_cast<const std::string&>(&composition::Composition::getComposition, py::const_),
+             py::arg("symbol"), "Returns a tuple (CompositionEntry, GlobalComposition) for the symbol. Requires finalization.")
+        // Binding the version returning map<string, Entry> requires a bit more care or helper function
+        // to convert the map to a Python dict if needed directly. Let's bind the pair version for now.
+         .def("getComposition", py::overload_cast<>(&composition::Composition::getComposition, py::const_),
+             "Returns a tuple (dict[str, CompositionEntry], GlobalComposition) for all symbols. Requires finalization.")
+
+
+        .def("subset", &composition::Composition::subset, py::arg("symbols"), py::arg("method") = "norm",
+             "Create a new Composition containing only the specified symbols.")
+        .def("hasSymbol", &composition::Composition::hasSymbol, py::arg("symbol"),
+             "Check if a symbol is registered.")
+        .def("setCompositionMode", &composition::Composition::setCompositionMode, py::arg("massFracMode"),
+             "Set the mode (True=Mass, False=Number). Requires finalization before switching.")
+
+        // Operator overload
+        .def(py::self + py::self, "Mix equally with another composition.") // Binds operator+
+
+        // Add __repr__ or __str__
+         .def("__repr__", [](const composition::Composition &comp) {
+             return get_ostream_str(comp); // Use helper for C++ operator<<
+         });
+
+    // --- Bindings for species module ---
+        py::class_<chemSpecies::Species>(chem_submodule, "Species")
+            .def("mass", &chemSpecies::Species::mass, "Get atomic mass (amu)")
+            .def("massUnc", &chemSpecies::Species::massUnc, "Get atomic mass uncertainty (amu)")
+            .def("bindingEnergy", &chemSpecies::Species::bindingEnergy, "Get binding energy (keV/nucleon?)") // Check units
+            .def("betaDecayEnergy", &chemSpecies::Species::betaDecayEnergy, "Get beta decay energy (keV?)") // Check units
+            .def("betaCode", [](const chemSpecies::Species& s){ return sv_to_string(s.betaCode()); }, "Get beta decay code") // Convert string_view
+            .def("name", [](const chemSpecies::Species& s){ return sv_to_string(s.name()); }, "Get species name (e.g., 'H-1')") // Convert string_view
+            .def("el", [](const chemSpecies::Species& s){ return sv_to_string(s.el()); }, "Get element symbol (e.g., 'H')") // Convert string_view
+            .def("nz", &chemSpecies::Species::nz, "Get NZ value")
+            .def("n", &chemSpecies::Species::n, "Get neutron number N")
+            .def("z", &chemSpecies::Species::z, "Get proton number Z")
+            .def("a", &chemSpecies::Species::a, "Get mass number A")
+
+        .def("__repr__",
+             [](const chemSpecies::Species &s) {
+                 std::ostringstream oss;
+                 oss << s;
+                 return oss.str();
+             });
+
+        chem_submodule.attr("species") = py::cast(chemSpecies::species); // Expose the species map
+
+
+}
\ No newline at end of file
diff --git a/src/python/composition/meson.build b/src/python/composition/meson.build
new file mode 100644
index 0000000..2449f5b
--- /dev/null
+++ b/src/python/composition/meson.build
@@ -0,0 +1,16 @@
+# Define the library
+bindings_sources = files('bindings.cpp')
+
+dependencies = [
+    composition_dep,
+    species_weight_dep,
+    python3_dep,
+    pybind11_dep,
+]
+
+libPYcomposition = shared_module('py_composition',
+                                bindings_sources,
+                                cpp_args: ['-fvisibility=default'],
+                                install : true,
+                                dependencies: dependencies,
+)
diff --git a/src/python/fourdstar/__init__.py b/src/python/fourdstar/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/python/meson.build b/src/python/meson.build
new file mode 100644
index 0000000..33d6298
--- /dev/null
+++ b/src/python/meson.build
@@ -0,0 +1 @@
+subdir('composition')
\ No newline at end of file
diff --git a/src/resource/meson.build b/src/resource/meson.build
index bc32862..7b4df2b 100644
--- a/src/resource/meson.build
+++ b/src/resource/meson.build
@@ -23,7 +23,7 @@ dependencies = [
 
 libResourceHeader_dep = declare_dependency(include_directories: include_directories('public'))
 # Define the libresourceManager library so it can be linked against by other parts of the build system
-libresourceManager = static_library('resourceManager',
+libresourceManager = library('resourceManager',
     resourceManager_sources, 
     include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
diff --git a/subprojects/pybind11.wrap b/subprojects/pybind11.wrap
new file mode 100644
index 0000000..b4024bb
--- /dev/null
+++ b/subprojects/pybind11.wrap
@@ -0,0 +1,13 @@
+[wrap-file]
+directory = pybind11-2.13.5
+source_url = https://github.com/pybind/pybind11/archive/refs/tags/v2.13.5.tar.gz
+source_filename = pybind11-2.13.5.tar.gz
+source_hash = b1e209c42b3a9ed74da3e0b25a4f4cd478d89d5efbb48f04b277df427faf6252
+patch_filename = pybind11_2.13.5-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/pybind11_2.13.5-1/get_patch
+patch_hash = ecb031b830481560b3d8487ed63ba4f5509a074be42f5d19af64d844c795e15b
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/pybind11_2.13.5-1/pybind11-2.13.5.tar.gz
+wrapdb_version = 2.13.5-1
+
+[provide]
+pybind11 = pybind11_dep
diff --git a/tests/composition_sandbox/comp.cpp b/tests/composition_sandbox/comp.cpp
index b628108..13e2c56 100644
--- a/tests/composition_sandbox/comp.cpp
+++ b/tests/composition_sandbox/comp.cpp
@@ -9,7 +9,6 @@ int main(int argv, char* argc[]) {
     } else {
         pathToConfigFile = "config.json";
     }
-    Config::getInstance().loadConfig(pathToConfigFile);
     composition::Composition comp;
     std::vector<std::string> symbols = {"H-1", "He-4"};
     comp.registerSymbol(symbols);