diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ecb7f0a..20a0be1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ on:
       - master
 
 env:
-  POETRY_VERSION: "1.3.0"
+  POETRY_VERSION: "1.6.1"
 
 jobs:
   cs:
diff --git a/poetry.lock b/poetry.lock
index 7d70153..27f753b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,10 +1,9 @@
-# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.6.1 and should not be changed by hand.
 
 [[package]]
 name = "alabaster"
 version = "0.7.13"
 description = "A configurable sidebar-enabled Sphinx theme"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -16,7 +15,6 @@ files = [
 name = "babel"
 version = "2.13.0"
 description = "Internationalization utilities"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -34,7 +32,6 @@ dev = ["freezegun (>=1.0,<2.0)", "pytest (>=6.0)", "pytest-cov"]
 name = "black"
 version = "23.9.1"
 description = "The uncompromising code formatter."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -81,7 +78,6 @@ uvloop = ["uvloop (>=0.15.2)"]
 name = "certifi"
 version = "2023.7.22"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -93,7 +89,6 @@ files = [
 name = "cfgv"
 version = "3.4.0"
 description = "Validate configuration and produce human readable error messages."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -105,7 +100,6 @@ files = [
 name = "charset-normalizer"
 version = "3.3.0"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "dev"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@@ -205,7 +199,6 @@ files = [
 name = "click"
 version = "8.1.7"
 description = "Composable command line interface toolkit"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -220,7 +213,6 @@ colorama = {version = "*", markers = "platform_system == \"Windows\""}
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@@ -232,7 +224,6 @@ files = [
 name = "coverage"
 version = "7.3.2"
 description = "Code coverage measurement for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -300,7 +291,6 @@ toml = ["tomli"]
 name = "distlib"
 version = "0.3.7"
 description = "Distribution utilities"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -312,7 +302,6 @@ files = [
 name = "docutils"
 version = "0.18.1"
 description = "Docutils -- Python Documentation Utilities"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
@@ -324,7 +313,6 @@ files = [
 name = "dulwich"
 version = "0.21.6"
 description = "Python Git Library"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -399,7 +387,6 @@ pgp = ["gpg"]
 name = "exceptiongroup"
 version = "1.1.3"
 description = "Backport of PEP 654 (exception groups)"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -414,7 +401,6 @@ test = ["pytest (>=6)"]
 name = "filelock"
 version = "3.12.4"
 description = "A platform independent file lock."
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -431,7 +417,6 @@ typing = ["typing-extensions (>=4.7.1)"]
 name = "identify"
 version = "2.5.30"
 description = "File identification library for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -446,7 +431,6 @@ license = ["ukkonen"]
 name = "idna"
 version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -458,7 +442,6 @@ files = [
 name = "imagesize"
 version = "1.4.1"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -470,7 +453,6 @@ files = [
 name = "importlib-metadata"
 version = "6.8.0"
 description = "Read metadata from Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -490,7 +472,6 @@ testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -502,7 +483,6 @@ files = [
 name = "jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -520,7 +500,6 @@ i18n = ["Babel (>=2.7)"]
 name = "markupsafe"
 version = "2.1.3"
 description = "Safely add untrusted strings to HTML/XML markup."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -590,7 +569,6 @@ files = [
 name = "mypy"
 version = "0.971"
 description = "Optional static typing for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -633,7 +611,6 @@ reports = ["lxml"]
 name = "mypy-extensions"
 version = "1.0.0"
 description = "Type system extensions for programs checked with the mypy type checker."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -645,7 +622,6 @@ files = [
 name = "nodeenv"
 version = "1.8.0"
 description = "Node.js virtual environment builder"
-category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*"
 files = [
@@ -660,7 +636,6 @@ setuptools = "*"
 name = "packaging"
 version = "23.2"
 description = "Core utilities for Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -672,7 +647,6 @@ files = [
 name = "pathspec"
 version = "0.11.2"
 description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -684,7 +658,6 @@ files = [
 name = "pbr"
 version = "5.11.1"
 description = "Python Build Reasonableness"
-category = "dev"
 optional = false
 python-versions = ">=2.6"
 files = [
@@ -696,7 +669,6 @@ files = [
 name = "platformdirs"
 version = "3.11.0"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -712,7 +684,6 @@ test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.4)", "pytest-co
 name = "pluggy"
 version = "1.3.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -728,7 +699,6 @@ testing = ["pytest", "pytest-benchmark"]
 name = "pre-commit"
 version = "2.21.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -747,7 +717,6 @@ virtualenv = ">=20.10.0"
 name = "pygments"
 version = "2.16.1"
 description = "Pygments is a syntax highlighting package written in Python."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -762,7 +731,6 @@ plugins = ["importlib-metadata"]
 name = "pytest"
 version = "7.4.2"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -785,7 +753,6 @@ testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "no
 name = "pytest-cov"
 version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -804,7 +771,6 @@ testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtuale
 name = "pytz"
 version = "2023.3.post1"
 description = "World timezone definitions, modern and historical"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -816,7 +782,6 @@ files = [
 name = "pyyaml"
 version = "6.0.1"
 description = "YAML parser and emitter for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -876,7 +841,6 @@ files = [
 name = "reno"
 version = "3.5.0"
 description = "RElease NOtes manager"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -898,7 +862,6 @@ test = ["coverage (>=4.0,!=4.4)", "openstackdocstheme (>=2.2.1)", "python-subuni
 name = "requests"
 version = "2.31.0"
 description = "Python HTTP for Humans."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -920,7 +883,6 @@ use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
 name = "setuptools"
 version = "68.2.2"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -937,7 +899,6 @@ testing-integration = ["build[virtualenv] (>=1.0.3)", "filelock (>=3.4.0)", "jar
 name = "snowballstemmer"
 version = "2.2.0"
 description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -949,7 +910,6 @@ files = [
 name = "sphinx"
 version = "5.3.0"
 description = "Python documentation generator"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@@ -985,7 +945,6 @@ test = ["cython", "html5lib", "pytest (>=4.6)", "typed_ast"]
 name = "sphinx-rtd-theme"
 version = "1.3.0"
 description = "Read the Docs theme for Sphinx"
-category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
 files = [
@@ -1005,7 +964,6 @@ dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client", "wheel"]
 name = "sphinxcontrib-applehelp"
 version = "1.0.4"
 description = "sphinxcontrib-applehelp is a Sphinx extension which outputs Apple help books"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1021,7 +979,6 @@ test = ["pytest"]
 name = "sphinxcontrib-devhelp"
 version = "1.0.2"
 description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1037,7 +994,6 @@ test = ["pytest"]
 name = "sphinxcontrib-htmlhelp"
 version = "2.0.1"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1053,7 +1009,6 @@ test = ["html5lib", "pytest"]
 name = "sphinxcontrib-jquery"
 version = "4.1"
 description = "Extension to include jQuery on newer Sphinx releases"
-category = "dev"
 optional = false
 python-versions = ">=2.7"
 files = [
@@ -1068,7 +1023,6 @@ Sphinx = ">=1.8"
 name = "sphinxcontrib-jsmath"
 version = "1.0.1"
 description = "A sphinx extension which renders display math in HTML via JavaScript"
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1083,7 +1037,6 @@ test = ["flake8", "mypy", "pytest"]
 name = "sphinxcontrib-qthelp"
 version = "1.0.3"
 description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1099,7 +1052,6 @@ test = ["pytest"]
 name = "sphinxcontrib-serializinghtml"
 version = "1.1.5"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@@ -1115,7 +1067,6 @@ test = ["pytest"]
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@@ -1127,7 +1078,6 @@ files = [
 name = "tomli"
 version = "2.0.1"
 description = "A lil' TOML parser"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1137,14 +1087,13 @@ files = [
 
 [[package]]
 name = "types-requests"
-version = "2.31.0.7"
+version = "2.31.0.8"
 description = "Typing stubs for requests"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "types-requests-2.31.0.7.tar.gz", hash = "sha256:4d930dcabbc2452e3d70728e581ac4ac8c2d13f62509ad9114673f542af8cb4e"},
-    {file = "types_requests-2.31.0.7-py3-none-any.whl", hash = "sha256:39844effefca88f4f824dcdc4127b813d3b86a56b2248d3d1afa58832040d979"},
+    {file = "types-requests-2.31.0.8.tar.gz", hash = "sha256:e1b325c687b3494a2f528ab06e411d7092cc546cc9245c000bacc2fca5ae96d4"},
+    {file = "types_requests-2.31.0.8-py3-none-any.whl", hash = "sha256:39894cbca3fb3d032ed8bdd02275b4273471aa5668564617cc1734b0a65ffdf8"},
 ]
 
 [package.dependencies]
@@ -1154,7 +1103,6 @@ urllib3 = ">=2"
 name = "types-toml"
 version = "0.10.8.7"
 description = "Typing stubs for toml"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -1166,7 +1114,6 @@ files = [
 name = "typing-extensions"
 version = "4.8.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1178,7 +1125,6 @@ files = [
 name = "urllib3"
 version = "2.0.6"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1196,7 +1142,6 @@ zstd = ["zstandard (>=0.18.0)"]
 name = "virtualenv"
 version = "20.24.5"
 description = "Virtual Python Environment builder"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -1217,7 +1162,6 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 name = "werkzeug"
 version = "3.0.0"
 description = "The comprehensive WSGI web application library."
-category = "main"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1235,7 +1179,6 @@ watchdog = ["watchdog (>=2.3)"]
 name = "zipp"
 version = "3.17.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
@@ -1249,5 +1192,5 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.8,<4.0"
-content-hash = "e7511f1afc429f8eb1b58307739f5db7b54d3e8bd0558fdcba70d174cb8f87f2"
+python-versions = ">=3.8"
+content-hash = "7644111a4ef753dab99fae185c0c34ef2dc30c918f525d75bdc2d3dd8614d596"
diff --git a/pyproject.toml b/pyproject.toml
index 01e1275..6d7d615 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ include = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8,<4.0"
+python = ">=3.8"
 Werkzeug = ">= 2.0.0"
 
 
diff --git a/tests/test_release.py b/tests/test_release.py
index e3bc6b1..caeac76 100644
--- a/tests/test_release.py
+++ b/tests/test_release.py
@@ -19,6 +19,7 @@
 
 NAME = "pytest-httpserver"
 NAME_UNDERSCORE = NAME.replace("-", "_")
+PY_MAX_VERSION = (3, 12)
 
 
 @pytest.fixture(scope="session")
@@ -120,20 +121,20 @@ def test_python_version(build: Build, pyproject):
     pyproject_meta = pyproject["tool"]["poetry"]
     wheel_meta = build.wheel.get_meta(version=pyproject_meta["version"])
     python_dependency = pyproject_meta["dependencies"]["python"]
-    m = re.match(r">=(\d+\.\d+),<(\d+\.\d+)", python_dependency)
+    m = re.match(r">=(\d+\.\d+)", python_dependency)
     if m:
-        min_version, max_version = m.groups()
+        min_version, *_ = m.groups()
     else:
         raise ValueError(python_dependency)
 
     min_version_tuple = version_to_tuple(min_version)
-    max_version_tuple = version_to_tuple(max_version)
 
     for classifier in wheel_meta.get_all("Classifier"):
         if classifier.startswith("Programming Language :: Python ::"):
             version_tuple = version_to_tuple(classifier.split("::")[-1].strip())
             if len(version_tuple) > 1:
-                assert version_tuple >= min_version_tuple and version_tuple < max_version_tuple
+                assert version_tuple >= min_version_tuple
+                assert version_tuple < PY_MAX_VERSION
 
 
 def test_wheel_no_extra_contents(build: Build, version: str):
@@ -168,7 +169,6 @@ def test_sdist_contents(build: Build, version: str):
             "pyproject.toml",
             "pytest_httpserver",
             "README.md",
-            "setup.py",
             "tests",
         },
         "doc": {