diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 00000000..106a4748
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,35 @@
+name: Lint
+
+on: [push, pull_request]
+
+concurrency:
+  group: check-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: test with ${{ matrix.py }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        py:
+          - "3.8"
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Setup python for test ${{ matrix.py }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.py }}
+      - name: Install tox
+        run: python -m pip install tox-gh>=1.2
+      - name: Setup test suite
+        run: tox -vv --notest
+      - name: Run test suite
+        run: tox --skip-pkg-install
\ No newline at end of file
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 00000000..7f414711
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,63 @@
+# Based on
+# https://packaging.python.org/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows/
+
+name: Publish Python distribution to PyPI
+
+on:
+  release:
+    types: [published]
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - name: Install pypa/build
+        run: |
+          python -m pip install --upgrade build
+          python -m pip list
+      - name: Build a binary wheel and a source tarball
+        run: python -m build
+      - name: Store the distribution packages
+        uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-pypi:
+    name: >-
+      Publish Python distribution to PyPI
+    if: github.event_name == 'release' # only publish to PyPI on releases
+    needs:
+      - build
+    runs-on: ubuntu-latest
+    environment:
+      name: release
+      url: https://pypi.org/p/compat-fork-hyper
+    permissions:
+      id-token: write # IMPORTANT: mandatory for trusted publishing
+
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - name: Publish distribution to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/hyper/common/headers.py b/hyper/common/headers.py
index 655a591a..94f32993 100644
--- a/hyper/common/headers.py
+++ b/hyper/common/headers.py
@@ -5,12 +5,12 @@
 
 Contains hyper's structures for storing and working with HTTP headers.
 """
-import collections
+import collections.abc
 
 from hyper.common.util import to_bytestring, to_bytestring_tuple
 
 
-class HTTPHeaderMap(collections.MutableMapping):
+class HTTPHeaderMap(collections.abc.MutableMapping):
     """
     A structure that contains HTTP headers.
 
diff --git a/hyper/http11/connection.py b/hyper/http11/connection.py
index 4311d307..e9523745 100644
--- a/hyper/http11/connection.py
+++ b/hyper/http11/connection.py
@@ -10,7 +10,7 @@
 import socket
 import base64
 
-from collections import Iterable, Mapping
+from collections.abc import Iterable, Mapping
 
 import collections
 from hyperframe.frame import SettingsFrame
diff --git a/hyper/http20/connection.py b/hyper/http20/connection.py
index b8be292b..5be9162c 100644
--- a/hyper/http20/connection.py
+++ b/hyper/http20/connection.py
@@ -32,6 +32,12 @@
 import threading
 import itertools
 
+try:
+    from h2.settings import ENABLE_PUSH
+except ImportError:
+    from h2.settings import SettingCodes
+    ENABLE_PUSH = SettingCodes.ENABLE_PUSH
+
 log = logging.getLogger(__name__)
 
 DEFAULT_WINDOW_SIZE = 65535
@@ -403,7 +409,7 @@ def _connect_upgrade(self, sock):
         with self._conn as conn:
             conn.initiate_upgrade_connection()
             conn.update_settings(
-                {h2.settings.ENABLE_PUSH: int(self._enable_push)}
+                {ENABLE_PUSH: int(self._enable_push)}
             )
         self._send_outstanding_data()
 
@@ -424,7 +430,7 @@ def _send_preamble(self):
         with self._conn as conn:
             conn.initiate_connection()
             conn.update_settings(
-                {h2.settings.ENABLE_PUSH: int(self._enable_push)}
+                {ENABLE_PUSH: int(self._enable_push)}
             )
         self._send_outstanding_data()
 
diff --git a/hyper/httplib_compat.py b/hyper/httplib_compat.py
index deb07cf6..76a34e9e 100644
--- a/hyper/httplib_compat.py
+++ b/hyper/httplib_compat.py
@@ -26,7 +26,6 @@
 
 # The HTTPConnection object is currently always the underlying one.
 HTTPConnection = httplib.HTTPConnection
-HTTPSConnection = httplib.HTTPSConnection
 
 # If we have NPN support, define our custom one, otherwise just use the
 # default.
@@ -114,3 +113,5 @@ def _delayed_connect(self):
             self._conn = tempconn
 
             return
+else:
+    HTTPSConnection = httplib.HTTPSConnection
diff --git a/setup.py b/setup.py
index 94cd8d21..4f876b35 100644
--- a/setup.py
+++ b/setup.py
@@ -69,15 +69,11 @@ def run_tests(self):
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
     ],
     install_requires=[
-        'h2>=2.4,<3.0,!=2.5.0', 'hyperframe>=3.2,<4.0', 'rfc3986>=1.1.0,<2.0', 'brotlipy>=0.7.0,<1.0'
+        'h2>=2.4', 'hyperframe>=3.2', 'rfc3986>=1.1.0', 'brotlipy>=0.7.0'
     ],
     tests_require=['pytest', 'requests', 'mock'],
     cmdclass={'test': PyTest},
@@ -88,15 +84,5 @@ def run_tests(self):
     },
     extras_require={
         'fast': ['pycohttpparser'],
-        # Fallback to good SSL on bad Python versions.
-        ':python_full_version < "2.7.9"': [
-            'pyOpenSSL>=0.15', 'service_identity>=14.0.0'
-        ],
-        # PyPy with bad SSL modules will likely also need the cryptography
-        # module at lower than 1.0, because it doesn't support CFFI v1.0 yet.
-        ':platform_python_implementation == "PyPy" and python_full_version < "2.7.9"': [
-            'cryptography<1.0'
-        ],
-        ':python_version == "2.7" or python_version == "3.3"': ['enum34>=1.0.4, <2']
     }
 )
diff --git a/test/test_http11.py b/test/test_http11.py
index 9f3fd3d0..af9304b1 100644
--- a/test/test_http11.py
+++ b/test/test_http11.py
@@ -12,7 +12,7 @@
 from collections import namedtuple
 from io import BytesIO, StringIO
 
-import mock
+from unittest import mock
 import pytest
 
 import hyper
@@ -986,7 +986,7 @@ def send(self, data):
 
         self.queue.append(data)
 
-    def recv(self, l):
+    def recv(self, l):  # noqa: E741
         data = self._buffer.read(l)
         self._read_counter += len(data)
         return memoryview(data)
diff --git a/test/test_http20.py b/test/test_http20.py
index d187c315..cdc24b9d 100644
--- a/test/test_http20.py
+++ b/test/test_http20.py
@@ -6,7 +6,7 @@
 Unit tests for hyper's HTTP/2.0 implementation.
 """
 import pytest
-from mock import patch
+from unittest.mock import patch
 
 from server import SocketLevelTest
 
diff --git a/test/test_hyper.py b/test/test_hyper.py
index b826c63c..dd3b526e 100644
--- a/test/test_hyper.py
+++ b/test/test_hyper.py
@@ -8,7 +8,7 @@
     WindowUpdateFrame, HeadersFrame, ContinuationFrame, GoAwayFrame,
     PingFrame, FRAME_MAX_ALLOWED_LEN
 )
-from hpack.hpack_compat import Encoder
+from hpack.hpack import Encoder
 from hyper.common.connection import HTTPConnection
 from hyper.http20.connection import HTTP20Connection
 from hyper.http20.response import HTTP20Response, HTTP20Push
@@ -29,6 +29,12 @@
 import brotli
 from io import BytesIO
 
+try:
+    from h2.settings import INITIAL_WINDOW_SIZE
+except ImportError:
+    from h2.settings import SettingCodes
+    INITIAL_WINDOW_SIZE = SettingCodes.INITIAL_WINDOW_SIZE
+
 TEST_DIR = os.path.abspath(os.path.dirname(__file__))
 TEST_CERTS_DIR = os.path.join(TEST_DIR, 'certs')
 CLIENT_PEM_FILE = os.path.join(TEST_CERTS_DIR, 'nopassword.pem')
@@ -766,7 +772,7 @@ def test_incrementing_window_after_close(self):
         # the default max frame size (16,384 bytes). That will, on the third
         # frame, trigger the processing to increment the flow control window,
         # which should then not happen.
-        f = SettingsFrame(0, settings={h2.settings.INITIAL_WINDOW_SIZE: 100})
+        f = SettingsFrame(0, settings={INITIAL_WINDOW_SIZE: 100})
 
         c = HTTP20Connection('www.google.com')
         c._sock = DummySocket()
@@ -1660,7 +1666,7 @@ def send(self, data):
 
     sendall = send
 
-    def recv(self, l):
+    def recv(self, l):  # noqa: E741
         data = self._buffer.read(l)
         self._read_counter += len(data)
         return memoryview(data)
diff --git a/test/test_integration.py b/test/test_integration.py
index 6a9ece42..d98a6978 100644
--- a/test/test_integration.py
+++ b/test/test_integration.py
@@ -15,7 +15,7 @@
 import pytest
 from socket import timeout as SocketTimeout
 from contextlib import contextmanager
-from mock import patch
+from unittest.mock import patch
 from concurrent.futures import ThreadPoolExecutor, TimeoutError
 from h2.frame_buffer import FrameBuffer
 from hyper.compat import ssl
diff --git a/test_requirements.txt b/test_requirements.txt
index cae2fbc6..49f205dd 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -2,5 +2,3 @@ pytest>=3.0
 pytest-xdist
 pytest-cov
 requests
-mock
-futures; python_version < '3.0'
diff --git a/tox.ini b/tox.ini
index 046619e9..463b44c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,21 @@
 [tox]
-envlist = py{27,34,35,36}, pypy, lint
+envlist = py38, pypy, lint
 
 [testenv]
 deps= -r{toxinidir}/test_requirements.txt
 commands=
-    coverage run -m py.test {toxinidir}/test/
+    coverage run -m pytest {toxinidir}/test/
     coverage report
 
 [testenv:pypy]
 # temporarily disable coverage testing on PyPy due to performance problems
-commands= py.test {toxinidir}/test/
+commands= pytest {toxinidir}/test/
 
 [testenv:lint]
 basepython=python3
-deps = flake8==2.5.4
+deps = flake8==7.1.1
 commands = flake8 hyper test
+
+[gh]
+python =
+    3.8 = py38,lint