diff --git a/meson.build b/meson.build
index 7c749e3..d94b34e 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('fourdst', 'cpp', version: 'v0.9.20', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
+project('fourdst', 'cpp', version: 'v0.9.21', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
 
 add_project_arguments('-fvisibility=default', language: 'cpp')
 
diff --git a/src-pybind/fourdst/__init__.py b/src-pybind/fourdst/__init__.py
index 31dfa55..815ea67 100644
--- a/src-pybind/fourdst/__init__.py
+++ b/src-pybind/fourdst/__init__.py
@@ -3,12 +3,14 @@ from __future__ import annotations
 import sys
 
 from ._phys import atomic, composition, constants, config
+from ._phys.composition import utils
 
 sys.modules['fourdst.atomic'] = atomic
 sys.modules['fourdst.composition'] = composition
 sys.modules['fourdst.constants'] = constants
 sys.modules['fourdst.config'] = config
+sys.modules['fourdst.composition.utils'] = utils
 
 __all__ = ['atomic', 'composition', 'constants', 'config', 'core', 'cli']
 
-__version__ = 'v0.9.11'
\ No newline at end of file
+__version__ = 'v0.9.21'
\ No newline at end of file