diff --git a/cuvec/CMakeLists.txt b/cuvec/CMakeLists.txt
index 153d5c3..d893d4c 100644
--- a/cuvec/CMakeLists.txt
+++ b/cuvec/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.24 FATAL_ERROR)
 if(NOT DEFINED SKBUILD_PROJECT_VERSION)
-  set(SKBUILD_PROJECT_VERSION 4 CACHE STRING "version" FORCE)
+  set(SKBUILD_PROJECT_VERSION 6 CACHE STRING "version" FORCE)
 endif()
 string(REGEX REPLACE [[([0-9]+)\.([0-9]+)\.([0-9]+).*]] [[\1.\2.\3]] SKBUILD_PROJECT_VERSION "${SKBUILD_PROJECT_VERSION}")
 project(cuvec LANGUAGES C CXX VERSION "${SKBUILD_PROJECT_VERSION}")
diff --git a/cuvec/__init__.py b/cuvec/__init__.py
index e211d1d..493b6df 100644
--- a/cuvec/__init__.py
+++ b/cuvec/__init__.py
@@ -3,8 +3,8 @@
 
 Python buffered array -> C++11 `std::vector` -> CUDA managed memory.
 """
-__author__ = "Casper O. da Costa-Luis"
-__date__ = "2021"
+__author__ = "Casper da Costa-Luis (https://github.com/casperdcl)"
+__date__ = "2021-2024"
 # version detector. Precedence: installed dist, git, 'UNKNOWN'
 try:
     from ._dist_ver import __version__
diff --git a/cuvec/cpython.py b/cuvec/cpython.py
index 0e9ad73..a6d53b3 100644
--- a/cuvec/cpython.py
+++ b/cuvec/cpython.py
@@ -11,6 +11,7 @@
 
 __all__ = [
     'CuVec', 'zeros', 'ones', 'zeros_like', 'ones_like', 'copy', 'asarray', 'Shape', 'typecodes']
+__author__, __date__, __version__ = cu.__author__, cu.__date__, cu.__version__
 
 log = logging.getLogger(__name__)
 vec_types = {
diff --git a/cuvec/pybind11.py b/cuvec/pybind11.py
index 8a108c6..c0f120e 100644
--- a/cuvec/pybind11.py
+++ b/cuvec/pybind11.py
@@ -15,6 +15,7 @@
 
 __all__ = [
     'CuVec', 'zeros', 'ones', 'zeros_like', 'ones_like', 'copy', 'asarray', 'Shape', 'typecodes']
+__author__, __date__, __version__ = cu.__author__, cu.__date__, cu.__version__
 
 log = logging.getLogger(__name__)
 vec_types = {
diff --git a/cuvec/src/cpython.cu b/cuvec/src/cpython.cu
index 3d77883..593fd6d 100644
--- a/cuvec/src/cpython.cu
+++ b/cuvec/src/cpython.cu
@@ -2,8 +2,6 @@
  * Unifying Python/C++/CUDA memory.
  *
  * Python buffered array -> C++11 `std::vector` -> CUDA managed memory.
- *
- * Copyright (2021) Casper da Costa-Luis
  */
 #include "cuvec_cpython.cuh" // PyCuVec, PyCuVec_tp
 #include <Python.h>
@@ -84,7 +82,7 @@ PyMODINIT_FUNC PyInit_cuvec_cpython(void) {
   if (author == NULL) return NULL;
   PyModule_AddObject(m, "__author__", author);
 
-  PyObject *date = Py_BuildValue("s", "2021");
+  PyObject *date = Py_BuildValue("s", "2021-2024");
   if (date == NULL) return NULL;
   PyModule_AddObject(m, "__date__", date);
 
diff --git a/cuvec/src/cuvec_swig.i b/cuvec/src/cuvec_swig.i
index 6da7c73..9ca0d33 100644
--- a/cuvec/src/cuvec_swig.i
+++ b/cuvec/src/cuvec_swig.i
@@ -56,3 +56,12 @@ MKCUVEC(_CUVEC_HALF, e)
 #endif
 MKCUVEC(float, f)
 MKCUVEC(double, d)
+
+%{
+static const char __author__[] = "Casper da Costa-Luis (https://github.com/casperdcl)";
+static const char __date__[] = "2021-2024";
+static const char __version__[] = "4.0.0";
+%}
+static const char __author__[];
+static const char __date__[];
+static const char __version__[];
diff --git a/cuvec/src/example_cpython/example_mod.cu b/cuvec/src/example_cpython/example_mod.cu
index df3bec4..f50f335 100644
--- a/cuvec/src/example_cpython/example_mod.cu
+++ b/cuvec/src/example_cpython/example_mod.cu
@@ -1,7 +1,7 @@
 /**
  * Example external extension module using CuVec.
  *
- * Copyright (2021) Casper da Costa-Luis
+ * Copyright (2021-2024) Casper da Costa-Luis
  */
 #include "Python.h"
 #include "cuvec_cpython.cuh" // PyCuVec
diff --git a/cuvec/src/example_pybind11/example_pybind11.cu b/cuvec/src/example_pybind11/example_pybind11.cu
index f26e086..99f2c94 100644
--- a/cuvec/src/example_pybind11/example_pybind11.cu
+++ b/cuvec/src/example_pybind11/example_pybind11.cu
@@ -1,7 +1,7 @@
 /**
  * Example external pybind11 extension module using CuVec.
  *
- * Copyright (2021) Casper da Costa-Luis
+ * Copyright (2024) Casper da Costa-Luis
  */
 #include "cuvec.cuh"           // NDCuVec
 #include <pybind11/pybind11.h> // pybind11, PYBIND11_MODULE
diff --git a/cuvec/src/example_swig/example_swig.cu b/cuvec/src/example_swig/example_swig.cu
index e2e1486..4bfc202 100644
--- a/cuvec/src/example_swig/example_swig.cu
+++ b/cuvec/src/example_swig/example_swig.cu
@@ -1,7 +1,7 @@
 /**
  * Example external SWIG extension module using CuVec.
  *
- * Copyright (2021) Casper da Costa-Luis
+ * Copyright (2021-2024) Casper da Costa-Luis
  */
 #include "cuvec.cuh" // NDCuVec
 #include <stdexcept> // std::length_error
diff --git a/cuvec/src/pybind11.cu b/cuvec/src/pybind11.cu
index fcdd4e2..064c30b 100644
--- a/cuvec/src/pybind11.cu
+++ b/cuvec/src/pybind11.cu
@@ -2,8 +2,6 @@
  * Unifying Python/C++/CUDA memory.
  *
  * pybind11 opaque vector -> C++11 `std::vector` -> CUDA managed memory.
- *
- * Copyright (2024) Casper da Costa-Luis
  */
 #include "cuvec_pybind11.cuh"  // PYBIND11_BIND_NDCUVEC
 #include <pybind11/pybind11.h> // PYBIND11_MODULE
@@ -27,4 +25,7 @@ PYBIND11_MODULE(cuvec_pybind11, m) {
 #endif
   PYBIND11_BIND_NDCUVEC(float, f);
   PYBIND11_BIND_NDCUVEC(double, d);
+  m.attr("__author__") = "Casper da Costa-Luis (https://github.com/casperdcl)";
+  m.attr("__date__") = "2024";
+  m.attr("__version__") = "2.0.0";
 }
diff --git a/cuvec/swig.py b/cuvec/swig.py
index 55dfe06..449e84d 100644
--- a/cuvec/swig.py
+++ b/cuvec/swig.py
@@ -18,6 +18,7 @@
 __all__ = [
     'CuVec', 'zeros', 'ones', 'zeros_like', 'ones_like', 'copy', 'asarray', 'retarray', 'Shape',
     'typecodes']
+__author__, __date__, __version__ = sw.__author__, sw.__date__, sw.__version__
 
 log = logging.getLogger(__name__)
 if hasattr(sw, 'NDCuVec_e_new'):
diff --git a/pyproject.toml b/pyproject.toml
index 072636f..900de9d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ classifiers = [
 dependencies = ['importlib_resources; python_version < "3.9"', "numpy"]
 
 [project.optional-dependencies]
-dev = ["pytest>=6", "pytest-cov", "pytest-timeout", "pytest-xdist"]
+dev = ["pytest>=6", "pytest-cov", "pytest-timeout", "pytest-xdist", "packaging"]
 
 [tool.mypy]
 [[tool.mypy.overrides]]
diff --git a/tests/test_common.py b/tests/test_common.py
index 6476a0f..875f427 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -2,6 +2,7 @@
 import logging
 
 import numpy as np
+from packaging import version
 from pytest import importorskip, mark, raises, skip
 
 import cuvec as cu
@@ -42,6 +43,13 @@ def test_cmake_prefix():
                 for i in ('Config', 'ConfigVersion', 'Targets', 'Targets-relwithdebinfo')}
 
 
+@mark.parametrize("cu", filter(None, [cp, py, sw]))
+def test_metadata(cu):
+    assert isinstance(cu.__author__, str)
+    assert isinstance(cu.__date__, str)
+    assert version.parse(cu.__version__).release
+
+
 @mark.parametrize("spec,result", [("i", np.int32), ("d", np.float64)])
 @mark.parametrize("init", ["zeros", "ones"])
 @mark.parametrize("cu", filter(None, [cp, py, sw]))