diff --git a/.cruft.json b/.cruft.json
new file mode 100644
index 0000000..301ccf8
--- /dev/null
+++ b/.cruft.json
@@ -0,0 +1,18 @@
+{
+  "template": "https://github.com/reef-technologies/cookiecutter-rt-pkg",
+  "commit": "9098eed1a7c4e44e568f990cb111e9ccb6bf78ca",
+  "checkout": null,
+  "context": {
+    "cookiecutter": {
+      "package_name": "django_business_metrics",
+      "repository_github_url": "https://github.com/reef-technologies/django-business-metrics",
+      "is_django_package": "y",
+      "_jinja2_env_vars": {
+        "block_start_string": "# COOKIECUTTER{%",
+        "block_end_string": "%}"
+      },
+      "_template": "https://github.com/reef-technologies/cookiecutter-rt-pkg"
+    }
+  },
+  "directory": null
+}
diff --git a/.gitignore b/.gitignore
index 714ac0d..d9603cb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,140 +1,16 @@
-# Byte-compiled / optimized / DLL files
-__pycache__/
-*.py[cod]
-*$py.class
-
-# C extensions
-*.so
-
-# Distribution / packaging
-.Python
-build/
-develop-eggs/
-dist/
-downloads/
-eggs/
-.eggs/
-lib/
-lib64/
-parts/
-sdist/
-var/
-wheels/
-pip-wheel-metadata/
-share/python-wheels/
+*.pyc
+*.sqlite3
+*~
 *.egg-info/
-.installed.cfg
-*.egg
-MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
-*.manifest
-*.spec
-
-# Installer logs
-pip-log.txt
-pip-delete-this-directory.txt
-
-# Unit test / coverage reports
-htmlcov/
-.tox/
-.nox/
-.coverage
-.coverage.*
-.cache
-nosetests.xml
-coverage.xml
-*.cover
-*.py,cover
-.hypothesis/
-.pytest_cache/
-
-# Translations
-*.mo
-*.pot
-
-# Django stuff:
-*.log
-local_settings.py
-db.sqlite3
-db.sqlite3-journal
-
-# Flask stuff:
-instance/
-.webassets-cache
-
-# Scrapy stuff:
-.scrapy
-
-# Sphinx documentation
-docs/_build/
-docs/site
-# PyBuilder
-target/
-
-# Jupyter Notebook
-.ipynb_checkpoints
-
-# IPython
-profile_default/
-ipython_config.py
-
-# pyenv
-.python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow
-__pypackages__/
-
-# Celery stuff
-celerybeat-schedule
-celerybeat.pid
-
-# SageMath parsed files
-*.sage.py
-
-# Environments
+/.idea/
 .env
 .venv
-env/
-/venv/
-ENV/
-env.bak/
-venv.bak/
-
-# Spyder project settings
-.spyderproject
-.spyproject
-
-# Rope project settings
-.ropeproject
-
-# mkdocs documentation
-/site
-
-# mypy
-.mypy_cache/
-.dmypy.json
-dmypy.json
-
-# Pyre type checker
-.pyre/
-.vscode/
-caches/
-.idea/
-__pypackages__
-.pdm.toml
+venv
+media/
+.backups/
+.envrc
 .pdm-python
-temp.py
-
-# Pyannotate generated stubs
-type_info.json
-.pdm-build/
+.terraform.lock.hcl
+.terraform/
+.nox/
+__pycache__
diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 0000000..f95210b
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,2 @@
+# disable errors related to cookiecutter templating:
+disable=SC1054,SC1056,SC1072,SC1073,SC1083,SC1009
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a67fc7..25a96b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-This project uses [*towncrier*](https://towncrier.readthedocs.io/) and the changes for the 
+This project uses [*towncrier*](https://towncrier.readthedocs.io/) and the changes for the
 upcoming release can be found in [changelog.d](changelog.d).
 
 <!-- towncrier release notes start -->
diff --git a/README.md b/README.md
index 7922e90..622b560 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
 # Django Prometheus business metrics
+&nbsp;[![Continuous Integration](https://github.com/reef-technologies/django-business-metrics/workflows/Continuous%20Integration/badge.svg)](https://github.com/reef-technologies/django-business-metrics/actions?query=workflow%3A%22Continuous+Integration%22)&nbsp;[![License](https://img.shields.io/pypi/l/django_business_metrics.svg?label=License)](https://pypi.python.org/pypi/django_business_metrics)&nbsp;[![python versions](https://img.shields.io/pypi/pyversions/django_business_metrics.svg?label=python%20versions)](https://pypi.python.org/pypi/django_business_metrics)&nbsp;[![PyPI version](https://img.shields.io/pypi/v/django_business_metrics.svg?label=PyPI%20version)](https://pypi.python.org/pypi/django_business_metrics)
 
 This Django app provides a Prometheus metrics endpoint serving so-called business metrics. These are metrics that are calculated when Prometheus hits the metrics endpoint.
 
 ## Usage
 
-> This project uses [ApiVer](https://www.youtube.com/watch?v=FgcoAKchPjk).
-> Always import from `django_business_metrics.v0` namespace and not from `django_business_metrics`.
-
+> [!IMPORTANT]
+> This package uses [ApiVer](#versioning), make sure to import `django_business_metrics.v0`.
 
 1. Create a `BusinessMetricsManager` object and register some metrics:
 
@@ -46,12 +46,24 @@ This Django app provides a Prometheus metrics endpoint serving so-called busines
 3. Setup your Prometheus agent to scrape metrics from `/business-metrics` endpoint.
 
 
+## Versioning
+
+This package uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+TL;DR you are safe to use [compatible release version specifier](https://packaging.python.org/en/latest/specifications/version-specifiers/#compatible-release) `~=MAJOR.MINOR` in your `pyproject.toml` or `requirements.txt`.
+
+Additionally, this package uses [ApiVer](https://www.youtube.com/watch?v=FgcoAKchPjk) to further reduce the risk of breaking changes.
+This means, the public API of this package is explicitly versioned, e.g. `django_business_metrics.v1`, and will not change in a backwards-incompatible way even when `django_business_metrics.v2` is released.
+
+Internal packages, i.e. prefixed by `django_business_metrics._` do not share these guarantees and may change in a backwards-incompatible way at any time even in patch releases.
+
+
 ## Development
 
+
 Pre-requisites:
 - [pdm](https://pdm.fming.dev/)
 - [nox](https://nox.thea.codes/en/stable/)
-- [docker](https://www.docker.com/) and [docker composep plugin](https://docs.docker.com/compose/)
+- [docker](https://www.docker.com/) and [docker compose plugin](https://docs.docker.com/compose/)
 
 
 Ideally, you should run `nox -t format lint` before every commit to ensure that the code is properly formatted and linted.
diff --git a/noxfile.py b/noxfile.py
index 09969de..ade2cde 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -19,27 +19,30 @@
 MAIN_BRANCH_NAME = "master"
 PYTHON_VERSIONS = ["3.9", "3.11", "3.12"]
 PYTHON_DEFAULT_VERSION = PYTHON_VERSIONS[-1]
-
 DJANGO_VERSIONS = ["3.2", "4.2"]
 DEMO_APP_DIR = ROOT / "demo"
 
 nox.options.default_venv_backend = "venv"
 nox.options.stop_on_first_error = True
-nox.options.reuse_existing_virtualenvs = True
+nox.options.reuse_existing_virtualenvs = not CI
 
 
-# In CI, use Python interpreter provided by GitHub Actions
 if CI:
+    # In CI, use Python interpreter provided by GitHub Actions
     PYTHON_VERSIONS = [sys.executable]
 
 
-def install(session: nox.Session, *args, no_self=False, no_default=False):
+def install(session: nox.Session, *groups, dev: bool = True, editable: bool = False, no_self=False, no_default=False):
     other_args = []
+    if not dev:
+        other_args.append("--prod")
+    if not editable:
+        other_args.append("--no-editable")
     if no_self:
         other_args.append("--no-self")
     if no_default:
         other_args.append("--no-default")
-    for group in args:
+    for group in groups:
         other_args.extend(["--group", group])
     session.run("pdm", "install", "--check", *other_args, external=True)
 
@@ -53,8 +56,7 @@ def _list_files() -> list[Path]:
     ):
         cmd_result = subprocess.run(cmd, check=True, text=True, capture_output=True)
         file_list.extend(cmd_result.stdout.splitlines())
-    file_paths = [Path(p) for p in file_list]
-    return file_paths
+    return [Path(p) for p in file_list]
 
 
 def list_files(suffix: str | None = None) -> list[Path]:
@@ -140,7 +142,8 @@ def format_(session):
 @nox.session(python=PYTHON_DEFAULT_VERSION, tags=["lint", "check"])
 def lint(session):
     """Run linters in readonly mode."""
-    install(session, "lint")
+    # "test" group is required for mypy to work against test files
+    install(session, "lint", "test")
     session.run("ruff", "check", "--diff", "--unsafe-fixes", ".")
     session.run("ruff", "format", "--diff", ".")
     session.run("mypy", ".")
@@ -152,7 +155,7 @@ def lint(session):
 @nox.session(python=PYTHON_VERSIONS, tags=["test", "check"])
 @nox.parametrize("django", DJANGO_VERSIONS)
 def test(session, django: str):
-    session.run("pdm", "install", "--dev")
+    install(session, "test")
     session.run("pip", "install", f"django~={django}.0")
     session.run("pytest", "-vv", "-n", "auto", *session.posargs)
 
@@ -162,7 +165,7 @@ def make_release(session):
     parser = argparse.ArgumentParser()
 
     def version(value):
-        if not re.match(r"\d+\.\d+\.\d+", value):
+        if not re.match(r"\d+\.\d+\.\d+(?:(?:a|b|rc)\d+)?", value):
             raise argparse.ArgumentTypeError("Invalid version format")
         return value
 
diff --git a/pdm.lock b/pdm.lock
index 787c613..1328d31 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -5,18 +5,7 @@
 groups = ["default", "lint", "release", "test"]
 strategy = ["cross_platform", "inherit_metadata"]
 lock_version = "4.4.1"
-content_hash = "sha256:59a295fc8c815eecfd20019fa496a32e96ed9e403868652ca428d08bd43497b0"
-
-[[package]]
-name = "argcomplete"
-version = "3.3.0"
-requires_python = ">=3.8"
-summary = "Bash tab completion for argparse"
-groups = ["test"]
-files = [
-    {file = "argcomplete-3.3.0-py3-none-any.whl", hash = "sha256:c168c3723482c031df3c207d4ba8fa702717ccb9fc0bfe4117166c1f537b4a54"},
-    {file = "argcomplete-3.3.0.tar.gz", hash = "sha256:fd03ff4a5b9e6580569d34b273f741e85cd9e072f3feeeee3eba4891c70eda62"},
-]
+content_hash = "sha256:da630db6a6fa07bedc5b0eb8f5961ea1ba5ef4086033c609e95dfa7b65ef114a"
 
 [[package]]
 name = "asgiref"
@@ -85,30 +74,6 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
-[[package]]
-name = "colorlog"
-version = "6.8.2"
-requires_python = ">=3.6"
-summary = "Add colours to the output of Python's logging module."
-groups = ["test"]
-dependencies = [
-    "colorama; sys_platform == \"win32\"",
-]
-files = [
-    {file = "colorlog-6.8.2-py3-none-any.whl", hash = "sha256:4dcbb62368e2800cb3c5abd348da7e53f6c362dda502ec27c560b2e58a66bd33"},
-    {file = "colorlog-6.8.2.tar.gz", hash = "sha256:3e3e079a41feb5a1b64f978b5ea4f46040a94f11f0e8bbb8261e3dbbeca64d44"},
-]
-
-[[package]]
-name = "distlib"
-version = "0.3.8"
-summary = "Distribution utilities"
-groups = ["test"]
-files = [
-    {file = "distlib-0.3.8-py2.py3-none-any.whl", hash = "sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784"},
-    {file = "distlib-0.3.8.tar.gz", hash = "sha256:1530ea13e350031b6312d8580ddb6b27a104275a31106523b8f123787f494f64"},
-]
-
 [[package]]
 name = "django"
 version = "4.2.13"
@@ -159,22 +124,6 @@ files = [
     {file = "django_stubs_ext-5.0.2.tar.gz", hash = "sha256:409c62585d7f996cef5c760e6e27ea3ff29f961c943747e67519c837422cad32"},
 ]
 
-[[package]]
-name = "django-stubs"
-version = "5.0.2"
-extras = ["compatible-mypy"]
-requires_python = ">=3.8"
-summary = "Mypy stubs for Django"
-groups = ["lint"]
-dependencies = [
-    "django-stubs==5.0.2",
-    "mypy~=1.10.0",
-]
-files = [
-    {file = "django_stubs-5.0.2-py3-none-any.whl", hash = "sha256:cb0c506cb5c54c64612e4a2ee8d6b913c6178560ec168009fe847c09747c304b"},
-    {file = "django_stubs-5.0.2.tar.gz", hash = "sha256:236bc5606e5607cb968f92b648471f9edaa461a774bc013bf9e6bff8730f6bdf"},
-]
-
 [[package]]
 name = "exceptiongroup"
 version = "1.2.1"
@@ -198,17 +147,6 @@ files = [
     {file = "execnet-2.1.1.tar.gz", hash = "sha256:5189b52c6121c24feae288166ab41b32549c7e2348652736540b9e6e7d4e72e3"},
 ]
 
-[[package]]
-name = "filelock"
-version = "3.14.0"
-requires_python = ">=3.8"
-summary = "A platform independent file lock."
-groups = ["test"]
-files = [
-    {file = "filelock-3.14.0-py3-none-any.whl", hash = "sha256:43339835842f110ca7ae60f1e1c160714c5a6afd15a2873419ab185334975c0f"},
-    {file = "filelock-3.14.0.tar.gz", hash = "sha256:6ea72da3be9b8c82afd3edcf99f2fffbb5076335a5ae4d03248bb5b6c3eae78a"},
-]
-
 [[package]]
 name = "freezegun"
 version = "1.5.1"
@@ -328,7 +266,7 @@ name = "mypy"
 version = "1.10.0"
 requires_python = ">=3.8"
 summary = "Optional static typing for Python"
-groups = ["lint", "test"]
+groups = ["lint"]
 dependencies = [
     "mypy-extensions>=1.0.0",
     "tomli>=1.1.0; python_version < \"3.11\"",
@@ -364,50 +302,21 @@ name = "mypy-extensions"
 version = "1.0.0"
 requires_python = ">=3.5"
 summary = "Type system extensions for programs checked with the mypy type checker."
-groups = ["lint", "test"]
+groups = ["lint"]
 files = [
     {file = "mypy_extensions-1.0.0-py3-none-any.whl", hash = "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"},
     {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
 ]
 
-[[package]]
-name = "nox"
-version = "2024.4.15"
-requires_python = ">=3.7"
-summary = "Flexible test automation."
-groups = ["test"]
-dependencies = [
-    "argcomplete<4.0,>=1.9.4",
-    "colorlog<7.0.0,>=2.6.1",
-    "packaging>=20.9",
-    "tomli>=1; python_version < \"3.11\"",
-    "virtualenv>=20.14.1",
-]
-files = [
-    {file = "nox-2024.4.15-py3-none-any.whl", hash = "sha256:6492236efa15a460ecb98e7b67562a28b70da006ab0be164e8821177577c0565"},
-    {file = "nox-2024.4.15.tar.gz", hash = "sha256:ecf6700199cdfa9e5ea0a41ff5e6ef4641d09508eda6edb89d9987864115817f"},
-]
-
 [[package]]
 name = "packaging"
-version = "24.0"
-requires_python = ">=3.7"
-summary = "Core utilities for Python packages"
-groups = ["test"]
-files = [
-    {file = "packaging-24.0-py3-none-any.whl", hash = "sha256:2ddfb553fdf02fb784c234c7ba6ccc288296ceabec964ad2eae3777778130bc5"},
-    {file = "packaging-24.0.tar.gz", hash = "sha256:eb82c5e3e56209074766e6885bb04b8c38a0c015d0a30036ebe7ece34c9989e9"},
-]
-
-[[package]]
-name = "platformdirs"
-version = "4.2.2"
+version = "24.1"
 requires_python = ">=3.8"
-summary = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
+summary = "Core utilities for Python packages"
 groups = ["test"]
 files = [
-    {file = "platformdirs-4.2.2-py3-none-any.whl", hash = "sha256:2d7a1657e36a80ea911db832a8a6ece5ee53d8de21edd5cc5879af6530b1bfee"},
-    {file = "platformdirs-4.2.2.tar.gz", hash = "sha256:38b7b51f512eed9e84a22788b4bce1de17c0adb134d6becb09836e37d8654cd3"},
+    {file = "packaging-24.1-py3-none-any.whl", hash = "sha256:5b8f2217dbdbd2f7f384c41c628544e6d52f2d0f53c6d0c3ea61aa5d1d7ff124"},
+    {file = "packaging-24.1.tar.gz", hash = "sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002"},
 ]
 
 [[package]]
@@ -451,6 +360,32 @@ files = [
     {file = "pytest-8.2.2.tar.gz", hash = "sha256:de4bb8104e201939ccdc688b27a89a7be2079b22e2bd2b07f806b6ba71117977"},
 ]
 
+[[package]]
+name = "pytest-apiver"
+version = "0.0.1"
+requires_python = ">=3.9"
+git = "https://github.com/reef-technologies/pytest_apiver.git"
+revision = "9d77f421d8b9d21d3f7fb7dc6caf4f9f98fb71a9"
+summary = ""
+groups = ["test"]
+dependencies = [
+    "pytest",
+]
+
+[[package]]
+name = "pytest-asyncio"
+version = "0.23.7"
+requires_python = ">=3.8"
+summary = "Pytest support for asyncio"
+groups = ["test"]
+dependencies = [
+    "pytest<9,>=7.0.0",
+]
+files = [
+    {file = "pytest_asyncio-0.23.7-py3-none-any.whl", hash = "sha256:009b48127fbe44518a547bddd25611551b0e43ccdbf1e67d12479f569832c20b"},
+    {file = "pytest_asyncio-0.23.7.tar.gz", hash = "sha256:5f5c72948f4c49e7db4f29f2521d4031f1c27f86e57b046126654083d4770268"},
+]
+
 [[package]]
 name = "pytest-django"
 version = "4.8.0"
@@ -496,28 +431,28 @@ files = [
 
 [[package]]
 name = "ruff"
-version = "0.4.8"
+version = "0.4.10"
 requires_python = ">=3.7"
 summary = "An extremely fast Python linter and code formatter, written in Rust."
-groups = ["lint", "test"]
-files = [
-    {file = "ruff-0.4.8-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:7663a6d78f6adb0eab270fa9cf1ff2d28618ca3a652b60f2a234d92b9ec89066"},
-    {file = "ruff-0.4.8-py3-none-macosx_11_0_arm64.whl", hash = "sha256:eeceb78da8afb6de0ddada93112869852d04f1cd0f6b80fe464fd4e35c330913"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:aad360893e92486662ef3be0a339c5ca3c1b109e0134fcd37d534d4be9fb8de3"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:284c2e3f3396fb05f5f803c9fffb53ebbe09a3ebe7dda2929ed8d73ded736deb"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:a7354f921e3fbe04d2a62d46707e569f9315e1a613307f7311a935743c51a764"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_ppc64.manylinux2014_ppc64.whl", hash = "sha256:72584676164e15a68a15778fd1b17c28a519e7a0622161eb2debdcdabdc71883"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:9678d5c9b43315f323af2233a04d747409d1e3aa6789620083a82d1066a35199"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:704977a658131651a22b5ebeb28b717ef42ac6ee3b11e91dc87b633b5d83142b"},
-    {file = "ruff-0.4.8-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d05f8d6f0c3cce5026cecd83b7a143dcad503045857bc49662f736437380ad45"},
-    {file = "ruff-0.4.8-py3-none-musllinux_1_2_aarch64.whl", hash = "sha256:6ea874950daca5697309d976c9afba830d3bf0ed66887481d6bca1673fc5b66a"},
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-    {file = "ruff-0.4.8.tar.gz", hash = "sha256:16d717b1d57b2e2fd68bd0bf80fb43931b79d05a7131aa477d66fc40fbd86268"},
+groups = ["lint"]
+files = [
+    {file = "ruff-0.4.10-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:5c2c4d0859305ac5a16310eec40e4e9a9dec5dcdfbe92697acd99624e8638dac"},
+    {file = "ruff-0.4.10-py3-none-macosx_11_0_arm64.whl", hash = "sha256:a79489607d1495685cdd911a323a35871abfb7a95d4f98fc6f85e799227ac46e"},
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+    {file = "ruff-0.4.10.tar.gz", hash = "sha256:3aa4f2bc388a30d346c56524f7cacca85945ba124945fe489952aadb6b5cd804"},
 ]
 
 [[package]]
@@ -620,13 +555,13 @@ files = [
 
 [[package]]
 name = "typing-extensions"
-version = "4.12.1"
+version = "4.12.2"
 requires_python = ">=3.8"
 summary = "Backported and Experimental Type Hints for Python 3.8+"
-groups = ["default", "lint", "test"]
+groups = ["default", "lint"]
 files = [
-    {file = "typing_extensions-4.12.1-py3-none-any.whl", hash = "sha256:6024b58b69089e5a89c347397254e35f1bf02a907728ec7fee9bf0fe837d203a"},
-    {file = "typing_extensions-4.12.1.tar.gz", hash = "sha256:915f5e35ff76f56588223f15fdd5938f9a1cf9195c0de25130c627e4d597f6d1"},
+    {file = "typing_extensions-4.12.2-py3-none-any.whl", hash = "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d"},
+    {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
 ]
 
 [[package]]
@@ -643,29 +578,13 @@ files = [
 
 [[package]]
 name = "urllib3"
-version = "2.2.1"
+version = "2.2.2"
 requires_python = ">=3.8"
 summary = "HTTP library with thread-safe connection pooling, file post, and more."
 groups = ["lint"]
 files = [
-    {file = "urllib3-2.2.1-py3-none-any.whl", hash = "sha256:450b20ec296a467077128bff42b73080516e71b56ff59a60a02bef2232c4fa9d"},
-    {file = "urllib3-2.2.1.tar.gz", hash = "sha256:d0570876c61ab9e520d776c38acbbb5b05a776d3f9ff98a5c8fd5162a444cf19"},
-]
-
-[[package]]
-name = "virtualenv"
-version = "20.26.2"
-requires_python = ">=3.7"
-summary = "Virtual Python Environment builder"
-groups = ["test"]
-dependencies = [
-    "distlib<1,>=0.3.7",
-    "filelock<4,>=3.12.2",
-    "platformdirs<5,>=3.9.1",
-]
-files = [
-    {file = "virtualenv-20.26.2-py3-none-any.whl", hash = "sha256:a624db5e94f01ad993d476b9ee5346fdf7b9de43ccaee0e0197012dc838a0e9b"},
-    {file = "virtualenv-20.26.2.tar.gz", hash = "sha256:82bf0f4eebbb78d36ddaee0283d43fe5736b53880b8a8cdcd37390a07ac3741c"},
+    {file = "urllib3-2.2.2-py3-none-any.whl", hash = "sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472"},
+    {file = "urllib3-2.2.2.tar.gz", hash = "sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168"},
 ]
 
 [[package]]
diff --git a/pyproject.toml b/pyproject.toml
index 4b4bd4e..0d7e6b2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,10 @@
 [project]
 name = "django-business-metrics"
 version = "1.0.2"
+requires-python = ">=3.9"
 description = "Django Prometheus business metrics"
-license = {file = "LICENSE"}
+keywords = []
+license = {text = "MIT"}
 readme = "README.md"
 authors = [
     {name = "Reef Technologies", email = "opensource@reef.pl"},
@@ -17,7 +19,6 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
 ]
-requires-python = ">=3.9"
 dependencies = [
     "Django>=3",
     "prometheus-client>=0.13.0",
@@ -27,21 +28,31 @@ dependencies = [
 "Source" = "https://github.com/reef-technologies/django-business-metrics"
 "Issue Tracker" = "https://github.com/reef-technologies/django-business-metrics/issues"
 
+[build-system]
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
+
+[tool.pytest.ini_options]
+pythonpath = ["."]  # allow for `import tests` in test files
+target_package_name = "django_business_metrics"  # required by pytest-apiver
+DJANGO_SETTINGS_MODULE="tests.settings"
+
 [tool.pdm]
+distribution = true
+
 [tool.pdm.dev-dependencies]
 test = [
     "freezegun",
-    "mypy>=0.971",
-    "nox>=2024",
+    "pytest",
+    "pytest-apiver @ git+https://github.com/reef-technologies/pytest_apiver.git",
+    "pytest-asyncio",
     "pytest-django",
     "pytest-xdist",
-    "pytest>=6",
-    "ruff>=0.4",
 ]
 lint = [
     "codespell[toml]",
-    "django-stubs[compatible-mypy]",
-    "mypy",
+    "django-stubs>=1.12.0",
+    "mypy>=1.8",
     "ruff",
     "types-freezegun",
     "types-python-dateutil",
@@ -51,13 +62,6 @@ release = [
     "towncrier",
 ]
 
-[build-system]
-requires = ["pdm-backend"]
-build-backend = "pdm.backend"
-
-[tool.pytest.ini_options]
-DJANGO_SETTINGS_MODULE="tests.settings"
-
 [tool.ruff]
 line-length = 120
 
@@ -133,5 +137,6 @@ exclude_dirs = ["tests"]
 module = [
     "nox",
     "pytest",
+    "tests.*",
 ]
 ignore_missing_imports = true
diff --git a/tests/conftest.py b/tests/conftest.py
index f2aac03..172ef99 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,13 +1 @@
-import pytest
-from django.contrib.auth import get_user_model
-from django.test import RequestFactory
-
-
-@pytest.fixture
-def request_factory():
-    return RequestFactory()
-
-
-@pytest.fixture
-def user_model():
-    return get_user_model()
+from .django_fixtures import *  # noqa: F401, F403
diff --git a/tests/django_fixtures.py b/tests/django_fixtures.py
new file mode 100644
index 0000000..7ff0043
--- /dev/null
+++ b/tests/django_fixtures.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+import pytest
+from django.contrib.auth import get_user_model
+from django.test import RequestFactory
+
+
+@pytest.fixture
+def request_factory() -> RequestFactory:
+    return RequestFactory()
+
+
+@pytest.fixture
+def user_model():
+    return get_user_model()
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..c2cf7c1
--- /dev/null
+++ b/tests/unit/__init__.py
@@ -0,0 +1,3 @@
+"""
+Tests for internals
+"""
diff --git a/tests/unit/api/__init__.py b/tests/unit/api/__init__.py
new file mode 100644
index 0000000..0cdb696
--- /dev/null
+++ b/tests/unit/api/__init__.py
@@ -0,0 +1,5 @@
+"""
+Tests covering the package API versioned with ApiVer.
+
+These tests will be run per each version of the API.
+"""
diff --git a/tests/unit/api/test_setup.py b/tests/unit/api/test_setup.py
new file mode 100644
index 0000000..0a77d41
--- /dev/null
+++ b/tests/unit/api/test_setup.py
@@ -0,0 +1,6 @@
+def test_apiver_exports(apiver_module):
+    assert sorted(name for name in dir(apiver_module) if not name.startswith("_")) == [
+        "BusinessMetricsManager",
+        "active_users",
+        "users",
+    ]
diff --git a/tests/unit/internal/__init__.py b/tests/unit/internal/__init__.py
new file mode 100644
index 0000000..0cdb696
--- /dev/null
+++ b/tests/unit/internal/__init__.py
@@ -0,0 +1,5 @@
+"""
+Tests covering the package API versioned with ApiVer.
+
+These tests will be run per each version of the API.
+"""
diff --git a/tests/unit/internal/test_django_setup.py b/tests/unit/internal/test_django_setup.py
new file mode 100644
index 0000000..cc26614
--- /dev/null
+++ b/tests/unit/internal/test_django_setup.py
@@ -0,0 +1,5 @@
+# cookiecutter-rt-pkg macro: requires cookiecutter.is_django_package
+
+
+def test__setup(db):
+    pass
diff --git a/tests/unit/internal/test_setup.py b/tests/unit/internal/test_setup.py
new file mode 100644
index 0000000..16a12ef
--- /dev/null
+++ b/tests/unit/internal/test_setup.py
@@ -0,0 +1,17 @@
+"""
+Basic test environment setup test.
+It should always pass as long as all dependencies are properly installed.
+"""
+
+from datetime import datetime, timedelta
+
+import pytest
+from freezegun import freeze_time
+
+
+def test__setup():
+    with freeze_time(datetime.now() - timedelta(days=1)):
+        pass
+
+    with pytest.raises(ZeroDivisionError):
+        1 / 0