diff --git a/Pipfile b/Pipfile
deleted file mode 100644
index 5bb5345..0000000
--- a/Pipfile
+++ /dev/null
@@ -1,15 +0,0 @@
-[[source]]
-name = "pypi"
-url = "https://pypi.org/simple"
-verify_ssl = true
-
-[packages]
-Cython = "<3"
-Jinja2 = "*"
-ruff = "*"
-pkgconfig = "*"
-pytest = "*"
-sphinx = "*"
-sphinx-multiversion = "*"
-tox = "*"
-wheel = "*"
diff --git a/README.md b/README.md
index 3deec4a..44839f1 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ While not directly supported by pycapnp, a tool has been created to help generat
 
 ## Python Versions
 
-Python 3.8+ is supported.
+Python 3.9+ is supported.
 
 
 ## Development
diff --git a/buildutils/bundle.py b/buildutils/bundle.py
index f6c28ee..b0c2e44 100644
--- a/buildutils/bundle.py
+++ b/buildutils/bundle.py
@@ -25,7 +25,7 @@ pjoin = os.path.join
 #
 
 
-bundled_version = (1, 0, 1)
+bundled_version = (1, 4, 0)
 libcapnp_name = "capnproto-c++-%i.%i.%i.tar.gz" % (bundled_version)
 libcapnp_url = "https://capnproto.org/" + libcapnp_name
 
diff --git a/pyproject.toml b/pyproject.toml
index 925cc22..74827ec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,6 +3,49 @@ requires = ["setuptools", "wheel", "pkgconfig", "cython>=3.0"]
 build-backend = "backend"
 backend-path = ["_custom_build"]
 
+[project]
+name = "pycapnp"
+requires-python = ">=3.9"
+dynamic = [
+    "authors",
+    "classifiers",
+    "description",
+    "keywords",
+    "license",
+    "readme",
+    "scripts",
+    "version",
+]
+dependencies = [
+    "jinja2",
+]
+
+[dependency-groups]
+dev = [
+    "ruff",
+    "tox",
+    "pkgconfig",
+    "cython>=3.0",
+    "setuptools",
+    {include-group = "test"},
+    {include-group = "docs"},
+]
+
+test = [
+    "pytest",
+    "anyio",
+    "pytest-asyncio",
+    "pytest-tornasync",
+    "pytest-trio",
+    "pytest-twisted",
+    "twisted",
+]
+
+docs = [
+    "sphinx",
+    "sphinx-multiversion",
+]
+
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index c9dfcc8..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-jinja2
-cython>=3
-ruff
-setuptools
-pkgconfig
-pytest
-sphinx
-sphinx-multiversion
-tox
-wheel
diff --git a/setup.py b/setup.py
index 4ec9c47..3852123 100644
--- a/setup.py
+++ b/setup.py
@@ -10,6 +10,7 @@ import struct
 import sys
 
 import pkgconfig
+import setuptools  # noqa: F401
 
 from distutils.command.clean import clean as _clean
 
@@ -23,7 +24,7 @@ from buildutils.bundle import fetch_libcapnp
 
 MAJOR = 2
 MINOR = 2
-MICRO = 3
+MICRO = 4
 TAG = ""
 VERSION = "%d.%d.%d%s" % (MAJOR, MINOR, MICRO, TAG)
 
@@ -204,7 +205,7 @@ extensions = [
 ]
 
 setup(
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     name="pycapnp",
     packages=["capnp"],
     version=VERSION,
@@ -237,7 +238,7 @@ setup(
     author="Jacob Alexander",  # <- Current maintainer; Original author -> Jason Paryani
     author_email="haata@kiibohd.com",
     url="https://github.com/capnproto/pycapnp",
-    download_url="https://github.com/haata/pycapnp/archive/v%s.zip" % VERSION,
+    download_url="https://github.com/capnproto/pycapnp/archive/v%s.zip" % VERSION,
     keywords=["capnp", "capnproto", "Cap'n Proto", "pycapnp"],
     classifiers=[
         "Development Status :: 5 - Production/Stable",
@@ -247,11 +248,12 @@ setup(
         "Operating System :: POSIX",
         "Programming Language :: C++",
         "Programming Language :: Cython",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Communications",
     ],