Support Python 3.14 (#2723)

Co-authored-by: Jair Henrique <jair.henrique@gmail.com>

Author: Kludex

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
         os: [windows-latest, ubuntu-latest, macos-latest]
 
     steps:

pyproject.toml

@@ -27,6 +27,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     "Topic :: Internet :: WWW/HTTP",
@@ -60,7 +61,7 @@ dev = [
     "types-click==7.1.8",
     "types-pyyaml==6.0.12.20250402",
     "trustme==1.2.1",
-    "cryptography==44.0.3",
+    "cryptography>=44.0.3",
     "coverage==7.8.0",
     "coverage-conditional-plugin==0.9.0",
     "coverage-enable-subprocess==1.0",
@@ -132,6 +133,8 @@ filterwarnings = [
     "ignore: websockets.legacy is deprecated.*:DeprecationWarning",
     "ignore: websockets.server.WebSocketServerProtocol is deprecated.*:DeprecationWarning",
     "ignore: websockets.client.connect is deprecated.*:DeprecationWarning",
+    # httptools in Python 3.14t needs the `PYTHON_GIL=0` environment variable, or raises a RuntimeWarning.
+    "ignore: The global interpreter lock (GIL)*:RuntimeWarning"
 ]
 
 [tool.coverage.run]

tests/test_compat.py

@@ -23,8 +23,6 @@ def test_asyncio_run__custom_loop_factory() -> None:
 
 
 def test_asyncio_run__passing_a_non_awaitable_callback_should_throw_error() -> None:
-    with pytest.raises(ValueError):
-        asyncio_run(
-            lambda: None,  # type: ignore
-            loop_factory=CustomLoop,
-        )
+    # TypeError on Python >= 3.14
+    with pytest.raises((ValueError, TypeError)):
+        asyncio_run(lambda: None, loop_factory=CustomLoop)  # type: ignore