Drop support for Python 3.10 by MadLittleMods · Pull Request #20359 · element-hq/synapse

MadLittleMods · 2026-10-14T22:27:15Z

Drop support for Python 3.10

Fix #20041

Thinking out loud, it would be nice to merge this before the RC next Tuesday as this is probably the last release before the next LTS. And it would be nice for any potential future security fixes not to have to contend with old Python differences. (didn't make it)

Dev notes

Keywords:

3.10
py310
cp310

Previous times we had to drop Python versions:

Python 3.9

Python 3.8:

Python 3.7:

Todo

Wait for Drop support for Python 3.10 matrix-org/sytest#1431 to merge
As a follow-up, we could enable the UP035 ruff rule to find a bunch of the typing_extensions imports that are no longer necessary

Pull Request Checklist

Pull request is based on the develop branch
Pull request includes a changelog file. The entry should:
- Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from EventStore to EventWorkerStore.".
- Use markdown where necessary, mostly for code blocks.
- End with either a period (.) or an exclamation mark (!).
- Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry.
Code style is correct (run the linters)

We have tests to cover this as well: `SYNAPSE_TEST_LOG_LEVEL=INFO poetry run trial tests.test_types.AbsentTestCase.test_copy`

Python 3.11 now has `tomllib` built-in

MadLittleMods · 2026-10-14T22:42:30Z

@@ -1,5 +1,5 @@
 [tox]
-envlist = py310, py311, py312, py313
+envlist = py311, py312, py313, py314


Added py314 as we do support Python 3.14 (supported added in #19055)

MadLittleMods · 2026-10-14T22:43:04Z

-    # Used for checking the Poetry lockfile
-    "tomli>=1.2.3",


We no longer need tomli as Python 3.11 now has tomllib built-in

MadLittleMods · 2026-10-14T22:43:25Z

        logger = self._create_explicitly_configured_logger()

-        with self.assertLogs(logger=logger, level=logging.NOTSET) as cm:
+        with self.assertNoLogs(logger=logger, level=logging.NOTSET):


This change matches the FIXME

MadLittleMods · 2026-10-14T22:44:10Z

-    def __copy__(self) -> "AbsentType":
-        """
-        Copy implementation used by `copy.copy()`.
-        Always use the same instance.
-
-        Without this and the deep version `__deepcopy__`,
-        `copy.copy(Absent)` on Python 3.10 (olddeps)
-        had a problem where it tried to construct a new Absent
-        as part of a deepcopy operation and resulted in:
-            ValueError: <object object at 0x7f64b3b6d930> is not a valid AbsentType
-        """
-        return self
-
-    def __deepcopy__(self, memo: object) -> "AbsentType":
-        """
-        Copy implementation used by `copy.deepcopy()`.
-        Always use the same instance.
-        """
-        return self


No longer necessary with Python 3.11

And there is test coverage that would yell if it was necessary: SYNAPSE_TEST_LOG_LEVEL=INFO poetry run trial tests.test_types.AbsentTestCase.test_copy

synapse/tests/test_types.py

Lines 285 to 297 in 0635bf6

def test_copy(self) -> None:

"""

Tests that the `copy` module always uses the same instance of Absent.

"""

class MyModel(BaseModel):

absent: AbsentType = Absent

a = MyModel.model_validate({})

b = copy.deepcopy(a)

self.assertIs(copy.copy(Absent), Absent)

self.assertIs(a.absent, b.absent)

MadLittleMods · 2026-10-14T22:45:14Z

 DISTS = (
    "debian:bookworm",  # (EOL 2028-06-30) (our EOL forced by Python 3.11 is 2027-10-31)
    "debian:sid",  # (rolling distro, no EOL)
-    "ubuntu:jammy",  # 22.04 LTS (EOL 2027-04-01) (our EOL forced by Python 3.10 is 2026-10-31)


We're able to drop this as ubuntu:jammy uses Python 3.10 which we no longer support (per the comment)

MadLittleMods · 2026-10-14T22:45:56Z

+# Upgrading to v1.164.0
+
+## Python 3.11+ is now required
+
+The minimum supported Python version has been increased from v3.10 to v3.11.
+You will need Python 3.11+ to run Synapse v1.164.0.
+
+If you use current versions of the
+[matrixorg/synapse](setup/installation.html#docker-images-and-ansible-playbooks)
+Docker images, no action is required.


Matches the previous language we used for this kind of thing:

synapse/docs/upgrade.md

Lines 301 to 308 in 0635bf6

## Python 3.10+ is now required

The minimum supported Python version has been increased from v3.9 to v3.10.

You will need Python 3.10+ to run Synapse v1.142.0.

If you use current versions of the

[matrixorg/synapse](setup/installation.html#docker-images-and-ansible-playbooks)

Docker images, no action is required.

MadLittleMods · 2026-10-15T00:19:00Z

+    # Support for Python 3.11 introduced in `psycopg2@2.9.5
+    "psycopg2>=2.9.5;platform_python_implementation != 'PyPy'",


psycopg2 changelog

Spawning from seeing the failure in CI: https://github.com/element-hq/synapse/actions/runs/38650610126/job/116148837886?pr=20359

See https://github.com/psycopg/psycopg2/blob/7d0375492ec3707b82b89f632c9654b400466d86/NEWS#L77

Conflicts: poetry.lock

> Python 3.11 is now officially supported > > *-- https://github.com/python-attrs/attrs/blob/ee66e7274852438cc23d4240a1a9cd632fda8b52/CHANGELOG.md#2210---2022-07-28* And we run into real errors without bumping when using Python 3.11: ``` /opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/attr/_make.py:640: RuntimeWarning: Running interpreter doesn't sufficiently support code object introspection. Some features like bare super() or accessing __class__ will not work with slotted classes. set_closure_cell(cell, cls) Traceback (most recent call last): File "<frozen runpy>", line 189, in _run_module_as_main File "<frozen runpy>", line 112, in _get_module_details File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/__init__.py", line 31, in <module> from synapse.util.rust import check_rust_lib_up_to_date File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/util/__init__.py", line 41, in <module> from synapse.types import JsonDict File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/types/__init__.py", line 1571, in <module> room_key=RoomStreamToken(stream=0), ^^^^^^^^^^^^^^^^^^^^^^^^^ File "<attrs generated init synapse.types.RoomStreamToken>", line 13, in __init__ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/types/__init__.py", line 891, in __attrs_post_init__ super().__attrs_post_init__() ^^^^^^^ TypeError: super(type, obj): obj must be an instance or subtype of type ```

MadLittleMods · 2026-10-20T19:59:48Z

-    "attrs>=19.2.0,!=21.1.0",
+    # We use attrs 22.1.0 as it introduced official support for Python 3.11 and we see
+    # actual breakages without it.
+    "attrs>=22.1.0",


Bumping because:

Python 3.11 is now officially supported

-- attrs changelog for 22.1.0 - 2022-07-28

And we run into real errors without bumping when using Python 3.11:

❌ https://github.com/element-hq/synapse/actions/runs/38659529140/job/116177840872?pr=20359

/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/attr/_make.py:640: RuntimeWarning: Running interpreter doesn't sufficiently support code object introspection. Some features like bare super() or accessing __class__ will not work with slotted classes. set_closure_cell(cell, cls) Traceback (most recent call last): File "<frozen runpy>", line 189, in _run_module_as_main File "<frozen runpy>", line 112, in _get_module_details File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/__init__.py", line 31, in <module> from synapse.util.rust import check_rust_lib_up_to_date File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/util/__init__.py", line 41, in <module> from synapse.types import JsonDict File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/types/__init__.py", line 1571, in <module> room_key=RoomStreamToken(stream=0), ^^^^^^^^^^^^^^^^^^^^^^^^^ File "<attrs generated init synapse.types.RoomStreamToken>", line 13, in __init__ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/types/__init__.py", line 891, in __attrs_post_init__ super().__attrs_post_init__() ^^^^^^^ TypeError: super(type, obj): obj must be an instance or subtype of type

See diff from to `v8.7.1` -> `v8.8.0` for the change daviddrysdale/python-phonenumbers@v8.7.1...v8.8.0#diff-a163e9caf9ba1eb648d821e36dfabebf016bfde72e3e88e000302e7194f6635fR102 Error we previously ran into: ``` Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/homeserver.py", line 42, in <module> from synapse.app import _base File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/_base.py", line 75, in <module> from synapse.events.auto_accept_invites import InviteAutoAccepter File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/events/auto_accept_invites.py", line 28, in <module> from synapse.module_api import EventBase, ModuleApi, run_as_background_process File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/module_api/__init__.py", line 58, in <module> from synapse.handlers.auth import ( File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/handlers/auth.py", line 78, in <module> from synapse.util.msisdn import phone_number_to_msisdn File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/util/msisdn.py", line 22, in <module> import phonenumbers File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/phonenumbers/__init__.py", line 137, in <module> from .phonenumbermatcher import PhoneNumberMatch, PhoneNumberMatcher, Leniency File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/phonenumbers/phonenumbermatcher.py", line 119, in <module> _PATTERN = re.compile(u("(?:") + _LEAD_CLASS + _PUNCTUATION + u(")") + _LEAD_LIMIT + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/__init__.py", line 227, in compile return _compile(pattern, flags) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/__init__.py", line 294, in _compile p = _compiler.compile(pattern, flags) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_compiler.py", line 745, in compile p = _parser.parse(p, flags) ^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 989, in parse p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 464, in _parse_sub itemsappend(_parse(source, state, verbose, nested + 1, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 850, in _parse raise source.error('global flags not at the start ' re.error: global flags not at the start of the expression at position 57 ```

See changelog, https://github.com/ICRAR/ijson/blob/82982f469fbff8def2c76a122ab7d23b7f313894/CHANGELOG.md#320 Previous error we would see with Python 3.11 running with the minimum dependency versions specified: ``` KeyError: 'char unsigned' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/homeserver.py", line 71, in <module> from synapse.server import HomeServer File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/server.py", line 72, in <module> from synapse.federation.federation_client import FederationClient File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/federation/federation_client.py", line 70, in <module> from synapse.federation.transport.client import SendJoinResponse File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/federation/transport/client.py", line 37, in <module> import ijson File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 36, in <module> backend = _default_backend() ^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 32, in _default_backend return get_backend(backend) ^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 24, in get_backend return importlib.import_module('ijson.backends.' + backend) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/backends/yajl2_cffi.py", line 13, in <module> ffi.cdef(""" File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/api.py", line 112, in cdef self._cdef(csource, override=override, packed=packed, pack=pack) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/api.py", line 126, in _cdef self._parser.parse(csource, override=override, **options) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 389, in parse self._internal_parse(csource) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 428, in _internal_parse realtype, quals = self._get_type_and_quals( ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 674, in _get_type_and_quals tp = self._get_struct_union_enum_type('struct', type, name) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 839, in _get_struct_union_enum_type type, fqual = self._get_type_and_quals(decl.type, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 631, in _get_type_and_quals itemtype, itemquals = self._get_type_and_quals(typenode.type) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 689, in _get_type_and_quals return self._parse_function_type(typenode, name), 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 723, in _parse_function_type args = [self._as_func_arg(*self._get_type_and_quals(argdeclnode.type)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 723, in <listcomp> args = [self._as_func_arg(*self._get_type_and_quals(argdeclnode.type)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 631, in _get_type_and_quals itemtype, itemquals = self._get_type_and_quals(typenode.type) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 669, in _get_type_and_quals tp0, quals0 = resolve_common_type(self, ident) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/commontypes.py", line 39, in resolve_common_type raise FFIError( cffi.FFIError: Unsupported type: 'char unsigned'. Please look at http://cffi.readthedocs.io/en/latest/cdef.html#ffi-cdef-limitations and file an issue if you think this type should really be supported. ```

MadLittleMods · 2026-10-23T22:29:04Z

+    # 8.8.0 is the first release that is compatible with Python 3.11.
+    # Previous versions run into `re.error: global flags not at the start of the expression`
+    "phonenumbers>=8.8.0",


Updated to minimum version compatible with Python 3.11

See diff from to v8.7.1 -> v8.8.0 for the change that made us compatible
daviddrysdale/python-phonenumbers@v8.7.1...v8.8.0#diff-a163e9caf9ba1eb648d821e36dfabebf016bfde72e3e88e000302e7194f6635fR102

Error we previously ran into:

Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/homeserver.py", line 42, in <module> from synapse.app import _base File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/_base.py", line 75, in <module> from synapse.events.auto_accept_invites import InviteAutoAccepter File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/events/auto_accept_invites.py", line 28, in <module> from synapse.module_api import EventBase, ModuleApi, run_as_background_process File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/module_api/__init__.py", line 58, in <module> from synapse.handlers.auth import ( File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/handlers/auth.py", line 78, in <module> from synapse.util.msisdn import phone_number_to_msisdn File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/util/msisdn.py", line 22, in <module> import phonenumbers File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/phonenumbers/__init__.py", line 137, in <module> from .phonenumbermatcher import PhoneNumberMatch, PhoneNumberMatcher, Leniency File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/phonenumbers/phonenumbermatcher.py", line 119, in <module> _PATTERN = re.compile(u("(?:") + _LEAD_CLASS + _PUNCTUATION + u(")") + _LEAD_LIMIT + ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/__init__.py", line 227, in compile return _compile(pattern, flags) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/__init__.py", line 294, in _compile p = _compiler.compile(pattern, flags) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_compiler.py", line 745, in compile p = _parser.parse(p, flags) ^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 989, in parse p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 464, in _parse_sub itemsappend(_parse(source, state, verbose, nested + 1, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/re/_parser.py", line 850, in _parse raise source.error('global flags not at the start ' re.error: global flags not at the start of the expression at position 57

MadLittleMods · 2026-10-23T22:30:35Z

+    # ijson 3.2.0 marks Python 3.11 as officially supported
+    "ijson>=3.2.0",


Updated to version with official Python 3.11 support

Mark Python 3.10 and 3.11 as explicitly supported.

-- ijson@3.2.0 changelog

Previous error we would see with Python 3.11 running with the minimum dependency versions specified:

KeyError: 'char unsigned' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/app/homeserver.py", line 71, in <module> from synapse.server import HomeServer File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/server.py", line 72, in <module> from synapse.federation.federation_client import FederationClient File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/federation/federation_client.py", line 70, in <module> from synapse.federation.transport.client import SendJoinResponse File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/federation/transport/client.py", line 37, in <module> import ijson File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 36, in <module> backend = _default_backend() ^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 32, in _default_backend return get_backend(backend) ^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/__init__.py", line 24, in get_backend return importlib.import_module('ijson.backends.' + backend) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/ijson/backends/yajl2_cffi.py", line 13, in <module> ffi.cdef(""" File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/api.py", line 112, in cdef self._cdef(csource, override=override, packed=packed, pack=pack) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/api.py", line 126, in _cdef self._parser.parse(csource, override=override, **options) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 389, in parse self._internal_parse(csource) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 428, in _internal_parse realtype, quals = self._get_type_and_quals( ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 674, in _get_type_and_quals tp = self._get_struct_union_enum_type('struct', type, name) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 839, in _get_struct_union_enum_type type, fqual = self._get_type_and_quals(decl.type, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 631, in _get_type_and_quals itemtype, itemquals = self._get_type_and_quals(typenode.type) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 689, in _get_type_and_quals return self._parse_function_type(typenode, name), 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 723, in _parse_function_type args = [self._as_func_arg(*self._get_type_and_quals(argdeclnode.type)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 723, in <listcomp> args = [self._as_func_arg(*self._get_type_and_quals(argdeclnode.type)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 631, in _get_type_and_quals itemtype, itemquals = self._get_type_and_quals(typenode.type) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/cparser.py", line 669, in _get_type_and_quals tp0, quals0 = resolve_common_type(self, ident) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/cffi/commontypes.py", line 39, in resolve_common_type raise FFIError( cffi.FFIError: Unsupported type: 'char unsigned'. Please look at http://cffi.readthedocs.io/en/latest/cdef.html#ffi-cdef-limitations and file an issue if you think this type should really be supported.

Previous error: ``` tests.logging.test_remote_handler.RemoteHandlerTestCase.test_log_backpressure_cut_middle =============================================================================== [ERROR] Traceback (most recent call last): File "/home/runner/work/synapse/synapse/tests/logging/test_remote_handler.py", line 58, in test_log_output handler = RemoteHandler("127.0.0.1", 9000, _reactor=self.reactor) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/logging/_remote.py", line 148, in __init__ self._service.startService() File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/twisted/application/internet.py", line 1179, in startService self._machine.start() File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_methodical.py", line 232, in __get__ @preserveName(self.method) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 43, in decorator return copyfunction(decorated, File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 35, in copyfunction return function(copycode(template.__code__, codechanges), *values) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 23, in copycode return code(*values) builtins.TypeError: code() argument 13 must be str, not int ``` `automat` doesn't have a changelog but tracked Python 3.11 compatibility with glyph/automat#135. From the backlinks there, you can also see how we ran into this before when we first introduced Python 3.11 support to Synapse.

MadLittleMods · 2026-10-23T22:44:16Z

+    # `automat` < 22.10.0 builds code objects positionally, which breaks on Python 3.11.
+    # `automat` doesn't have a changelog but Python 3.11 support was tracked by
+    # https://github.com/glyph/automat/issues/135
+    "automat>=22.10.0", # via twisted


automat doesn't have a changelog but tracked Python 3.11 compatibility with glyph/automat#135. From the backlinks there, you can also see how we ran into this before when we first introduced Python 3.11 support to Synapse.

Previous error:

tests.logging.test_remote_handler.RemoteHandlerTestCase.test_log_backpressure_cut_middle =============================================================================== [ERROR] Traceback (most recent call last): File "/home/runner/work/synapse/synapse/tests/logging/test_remote_handler.py", line 58, in test_log_output handler = RemoteHandler("127.0.0.1", 9000, _reactor=self.reactor) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/synapse/logging/_remote.py", line 148, in __init__ self._service.startService() File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/twisted/application/internet.py", line 1179, in startService self._machine.start() File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_methodical.py", line 232, in __get__ @preserveName(self.method) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 43, in decorator return copyfunction(decorated, File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 35, in copyfunction return function(copycode(template.__code__, codechanges), *values) File "/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/automat/_introspection.py", line 23, in copycode return code(*values) builtins.TypeError: code() argument 13 must be str, not int

> Twisted now officially supports Python 3.11. > > *-- https://github.com/twisted/twisted/blob/44048df8c7581df6112016747bfe864e93ac0809/NEWS.rst#twisted-2380-2023-08-28*

MadLittleMods · 2026-10-23T23:48:53Z

+    # Twisted 23.8.0 adds official support for Python 3.11
+    "Twisted[tls]>=23.8.0",


Bump minimum twisted version for official Python 3.11 support

Twisted now officially supports Python 3.11.

-- Twisted 23.8.0. (2023-08-28) changelog

MadLittleMods · 2026-10-23T23:50:30Z

@@ -0,0 +1 @@
+Remove support for Python 3.10.


Sytest CI failures expected to fail until matrix-org/sytest#1431 merges

devonh · 2026-10-26T17:35:04Z

@@ -1 +1 @@
 [project]


All the changes here look fine to me.
Any idea what's up with the CI failures?

Complement is just normal flakes

Sytest was because the Docker image builds didn't finish yet after merging matrix-org/sytest#1431

MadLittleMods · 2026-10-26T21:26:34Z

Thanks for the review @devonh 🦕

@reivilibre

As far as I can tell, no one uses it. @reivilibre also asked this in [`#synapse-dev:matrix.org`](https://matrix.to/#/!i5D5LLct_DYG-4hQprLzrxdbZ580U9UB6AEgFnk6rZQ/$NrW3QmLEGgcjNqW-SaPZrS-EVwq1-9fO_Ds_1QIZX0E?via=element.io&via=matrix.org&via=starstruck.systems) and [`#element-backend-internal:matrix.org`](https://matrix.to/#/!SGNQGPGUwtcPBUotTL:matrix.org/$_rh3S79z4q1Q93SJ3ncQ_ZUzudks4Egan5dwutH2AKg?via=jki.re&via=element.io&via=matrix.org) on 2026-02-20 with a couple of 🔥 emoji reactions in the public channel. As long as I've worked on Synapse, as far as I know, I've never used this for local dev. We no longer use this in CI. Noticed the file again while working on #20359

Fix element-hq#20041 Keywords: - `3.10` - `py310` - `cp310`

@reivilibre

As far as I can tell, no one uses it. @reivilibre also asked this in [`#synapse-dev:matrix.org`](https://matrix.to/#/!i5D5LLct_DYG-4hQprLzrxdbZ580U9UB6AEgFnk6rZQ/$NrW3QmLEGgcjNqW-SaPZrS-EVwq1-9fO_Ds_1QIZX0E?via=element.io&via=matrix.org&via=starstruck.systems) and [`#element-backend-internal:matrix.org`](https://matrix.to/#/!SGNQGPGUwtcPBUotTL:matrix.org/$_rh3S79z4q1Q93SJ3ncQ_ZUzudks4Egan5dwutH2AKg?via=jki.re&via=element.io&via=matrix.org) on 2026-02-20 with a couple of 🔥 emoji reactions in the public channel. As long as I've worked on Synapse, as far as I know, I've never used this for local dev. We no longer use this in CI. Noticed the file again while working on element-hq#20359

MadLittleMods added 7 commits October 14, 2026 17:00

Update obvious "3.10" references

b0d8409

Migrate to assertNoLogs

720f158

Update py310 references

65f46d4

Update cp310 references

aa8b6a7

poetry lock

71ba16e

AbsentType.__copy__ and __deepcopy__ not necessary anymore

b4d4ba0

We have tests to cover this as well: `SYNAPSE_TEST_LOG_LEVEL=INFO poetry run trial tests.test_types.AbsentTestCase.test_copy`

Add missing 3.14 reference to tox.ini

b4255a3

MadLittleMods added the python label Oct 14, 2026

MadLittleMods added 6 commits October 14, 2026 17:28

Add changelog

9f958ad

Remove stray formatting

d18a98a

Fixup more py310

deabe3f

Fix py314 reference

707da95

We no longer need tomli

5d3e18a

Python 3.11 now has `tomllib` built-in

Better explain state of why pympler version

28a44a3

MadLittleMods commented Oct 14, 2026

View reviewed changes

MadLittleMods added 4 commits October 14, 2026 17:48

Better point out what we mean

bdb5a86

poetry lock

3b747ea

Avoid running duplicate version

ffe0cb8

Better comments

9ccc88d

MadLittleMods commented Oct 15, 2026

View reviewed changes

Update psycopg2 to compatible Python 3.11 version

23aae81

See https://github.com/psycopg/psycopg2/blob/7d0375492ec3707b82b89f632c9654b400466d86/NEWS#L77

MadLittleMods force-pushed the madlittlemods/20041-drop-python-3.10 branch from 1c8ae16 to 23aae81 Compare October 15, 2026 00:21

MadLittleMods added 2 commits October 20, 2026 14:54

Merge branch 'develop' into madlittlemods/20041-drop-python-3.10

283e95b

Conflicts: poetry.lock

MadLittleMods commented Oct 20, 2026

View reviewed changes

MadLittleMods added 3 commits October 23, 2026 10:34

poetry lock

e996c54

MadLittleMods mentioned this pull request Oct 23, 2026

Drop support for Python 3.10 matrix-org/sytest#1431

Merged

MadLittleMods commented Oct 23, 2026

View reviewed changes

MadLittleMods added 4 commits October 23, 2026 17:46

poetry lock

70f1a59

Merge branch 'develop' into madlittlemods/20041-drop-python-3.10

6ffd4f8

poetry lock

3b45c20

Bump minimum twisted version for official Python 3.11 support

868bcc8

> Twisted now officially supports Python 3.11. > > *-- https://github.com/twisted/twisted/blob/44048df8c7581df6112016747bfe864e93ac0809/NEWS.rst#twisted-2380-2023-08-28*

MadLittleMods commented Oct 23, 2026

View reviewed changes

MadLittleMods marked this pull request as ready for review October 24, 2026 00:07

MadLittleMods requested a review from a team as a code owner October 24, 2026 00:07

MadLittleMods requested review from devonh and removed request for a team October 24, 2026 00:07

Merge branch 'develop' into madlittlemods/20041-drop-python-3.10

ce1a243

devonh approved these changes Oct 26, 2026

View reviewed changes

Merge branch 'develop' into madlittlemods/20041-drop-python-3.10

20f8ce7

MadLittleMods merged commit 4cece59 into develop Oct 26, 2026
81 of 84 checks passed

MadLittleMods deleted the madlittlemods/20041-drop-python-3.10 branch October 26, 2026 21:26

MadLittleMods mentioned this pull request Oct 26, 2026

Remove tox.ini #20410

Merged

3 tasks done

This was referenced Oct 28, 2026

Apply the MSC4354 Sticky Events history visibility exemptions over federation. #20371

Open

Drop support for SQLite versions older than 3.40.0 #20426

Open

sakaru pushed a commit to sakaru/synapse that referenced this pull request Oct 28, 2026

Drop support for Python 3.10 (element-hq#20359)

8065147

Fix element-hq#20041 Keywords: - `3.10` - `py310` - `cp310`

	def test_copy(self) -> None:
	"""
	Tests that the `copy` module always uses the same instance of Absent.
	"""

	class MyModel(BaseModel):
	absent: AbsentType = Absent

	a = MyModel.model_validate({})
	b = copy.deepcopy(a)

	self.assertIs(copy.copy(Absent), Absent)
	self.assertIs(a.absent, b.absent)

	## Python 3.10+ is now required

	The minimum supported Python version has been increased from v3.9 to v3.10.
	You will need Python 3.10+ to run Synapse v1.142.0.

	If you use current versions of the
	[matrixorg/synapse](setup/installation.html#docker-images-and-ansible-playbooks)
	Docker images, no action is required.

		# Support for Python 3.11 introduced in `psycopg2@2.9.5
		"psycopg2>=2.9.5;platform_python_implementation != 'PyPy'",

		# ijson 3.2.0 marks Python 3.11 as officially supported
		"ijson>=3.2.0",

		# Twisted 23.8.0 adds official support for Python 3.11
		"Twisted[tls]>=23.8.0",

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MadLittleMods Oct 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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MadLittleMods commented Oct 26, 2026

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MadLittleMods commented Oct 14, 2026 •

edited by devonh

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