diff --git a/pyproject.toml b/pyproject.toml
index 50e7829aaed..4776b608705 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -135,6 +135,9 @@ known-first-party = ["poetry"]
 known-third-party = ["poetry.core"]
 required-imports = ["from __future__ import annotations"]
 
+[tool.ruff.per-file-ignores]
+"src/poetry/console/*" = ["RUF012"]  # Can't annotate properly until new version of Cleo
+
 [tool.black]
 target-version = ['py38']
 preview = true
diff --git a/src/poetry/config/config.py b/src/poetry/config/config.py
index b19bb16afb9..6d7658645ae 100644
--- a/src/poetry/config/config.py
+++ b/src/poetry/config/config.py
@@ -9,6 +9,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import ClassVar
 
 from packaging.utils import canonicalize_name
 
@@ -104,7 +105,7 @@ def validator(cls, policy: str) -> bool:
 
 
 class Config:
-    default_config: dict[str, Any] = {
+    default_config: ClassVar[dict[str, Any]] = {
         "cache-dir": str(DEFAULT_CACHE_DIR),
         "virtualenvs": {
             "create": True,
diff --git a/src/poetry/packages/locker.py b/src/poetry/packages/locker.py
index a0cbfb24f51..69adb802ef6 100644
--- a/src/poetry/packages/locker.py
+++ b/src/poetry/packages/locker.py
@@ -9,6 +9,7 @@
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import ClassVar
 from typing import cast
 
 from packaging.utils import canonicalize_name
@@ -50,8 +51,13 @@ class Locker:
     _VERSION = "2.0"
     _READ_VERSION_RANGE = ">=1,<3"
 
-    _legacy_keys = ["dependencies", "source", "extras", "dev-dependencies"]
-    _relevant_keys = [*_legacy_keys, "group"]
+    _legacy_keys: ClassVar[list[str]] = [
+        "dependencies",
+        "source",
+        "extras",
+        "dev-dependencies",
+    ]
+    _relevant_keys: ClassVar[list[str]] = [*_legacy_keys, "group"]
 
     def __init__(self, lock: Path, local_config: dict[str, Any]) -> None:
         self._lock = lock
diff --git a/src/poetry/puzzle/provider.py b/src/poetry/puzzle/provider.py
index ea1eb8d9559..e8204fffcf3 100644
--- a/src/poetry/puzzle/provider.py
+++ b/src/poetry/puzzle/provider.py
@@ -7,6 +7,7 @@
 from collections import defaultdict
 from contextlib import contextmanager
 from typing import TYPE_CHECKING
+from typing import ClassVar
 from typing import cast
 
 from cleo.ui.progress_indicator import ProgressIndicator
@@ -93,7 +94,7 @@ def _formatter_elapsed(self) -> str:
 
 
 class Provider:
-    UNSAFE_PACKAGES: set[str] = set()
+    UNSAFE_PACKAGES: ClassVar[set[str]] = set()
 
     def __init__(
         self,
diff --git a/src/poetry/repositories/link_sources/base.py b/src/poetry/repositories/link_sources/base.py
index b2bd455d42a..9948ec8cd35 100644
--- a/src/poetry/repositories/link_sources/base.py
+++ b/src/poetry/repositories/link_sources/base.py
@@ -5,6 +5,7 @@
 
 from functools import cached_property
 from typing import TYPE_CHECKING
+from typing import ClassVar
 from typing import DefaultDict
 from typing import List
 
@@ -31,7 +32,7 @@
 class LinkSource:
     VERSION_REGEX = re.compile(r"(?i)([a-z0-9_\-.]+?)-(?=\d)([a-z0-9_.!+-]+)")
     CLEAN_REGEX = re.compile(r"[^a-z0-9$&+,/:;=?@.#%_\\|-]", re.I)
-    SUPPORTED_FORMATS = [
+    SUPPORTED_FORMATS: ClassVar[list[str]] = [
         ".tar.gz",
         ".whl",
         ".zip",
diff --git a/src/poetry/utils/setup_reader.py b/src/poetry/utils/setup_reader.py
index f9cecc4335a..53cd5e9e68e 100644
--- a/src/poetry/utils/setup_reader.py
+++ b/src/poetry/utils/setup_reader.py
@@ -5,6 +5,7 @@
 from configparser import ConfigParser
 from typing import TYPE_CHECKING
 from typing import Any
+from typing import ClassVar
 
 from poetry.core.constraints.version import Version
 
@@ -18,7 +19,7 @@ class SetupReader:
     Class that reads a setup.py file without executing it.
     """
 
-    DEFAULT: dict[str, Any] = {
+    DEFAULT: ClassVar[dict[str, Any]] = {
         "name": None,
         "version": None,
         "install_requires": [],
@@ -26,7 +27,7 @@ class SetupReader:
         "python_requires": None,
     }
 
-    FILES = ["setup.py", "setup.cfg"]
+    FILES: ClassVar[list[str]] = ["setup.py", "setup.cfg"]
 
     @classmethod
     def read_from_directory(cls, directory: Path) -> dict[str, Any]:
diff --git a/tests/console/test_application.py b/tests/console/test_application.py
index 21310a81478..931944e227f 100644
--- a/tests/console/test_application.py
+++ b/tests/console/test_application.py
@@ -3,6 +3,7 @@
 import re
 
 from typing import TYPE_CHECKING
+from typing import ClassVar
 
 import pytest
 
@@ -32,7 +33,7 @@ def handle(self) -> int:
 
 
 class AddCommandPlugin(ApplicationPlugin):
-    commands = [FooCommand]
+    commands: ClassVar[list[type[Command]]] = [FooCommand]
 
 
 @pytest.fixture
diff --git a/tests/plugins/test_plugin_manager.py b/tests/plugins/test_plugin_manager.py
index 7ac296b8ef9..b6baa358ec7 100644
--- a/tests/plugins/test_plugin_manager.py
+++ b/tests/plugins/test_plugin_manager.py
@@ -2,6 +2,7 @@
 
 from pathlib import Path
 from typing import TYPE_CHECKING
+from typing import ClassVar
 from typing import Protocol
 
 import pytest
@@ -22,6 +23,7 @@
     from cleo.io.io import IO
     from pytest_mock import MockerFixture
 
+    from poetry.console.commands.command import Command
     from tests.conftest import Config
     from tests.types import FixtureDirGetter
 
@@ -38,7 +40,7 @@ def activate(self, poetry: Poetry, io: IO) -> None:
 
 
 class MyCommandPlugin(ApplicationPlugin):
-    commands = []
+    commands: ClassVar[list[type[Command]]] = []
 
 
 class InvalidPlugin: