diff --git a/.flake8 b/.flake8
index 2d16cf2abc3..2780c9c145e 100644
--- a/.flake8
+++ b/.flake8
@@ -6,7 +6,7 @@ ban-relative-imports = true
 format-greedy = 1
 inline-quotes = double
 enable-extensions = TC, TC1
-type-checking-exempt-modules = typing, typing-extensions
+type-checking-strict = true
 eradicate-whitelist-extend = ^-.*;
 extend-ignore =
     # E203: Whitespace before ':' (pycqa/pycodestyle#373)
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c4e363a2d8f..34d488fee6d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, macOS, Windows]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         include:
           - os: Ubuntu
             image: ubuntu-22.04
@@ -83,11 +83,6 @@ jobs:
           # Using `timeout` is a safeguard against the Poetry command hanging for some reason.
           timeout 10s poetry run pip --version || rm -rf .venv
 
-      # XXX: https://github.com/pypa/pip/issues/11352 causes random failures -- remove once fixed in a release.
-      - name: Upgrade pip on Python 3.11
-        if: ${{ matrix.python-version == '3.11-dev' }}
-        run: poetry run pip install git+https://github.com/pypa/pip.git@f8a25921e5c443b07483017b0ffdeb08b9ba2fdf
-
       - name: Install dependencies
         run: poetry install --with github-actions
 
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 27563811d61..17577f47aca 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -40,7 +40,7 @@ repos:
           - flake8-quotes==3.3.1
           - flake8-simplify==0.19.3
           - flake8-tidy-imports==4.8.0
-          - flake8-type-checking==2.1.2
+          - flake8-type-checking==2.2.0
           - flake8-typing-imports==1.12.0
           - flake8-use-fstring==1.4
           - pep8-naming==0.13.1
diff --git a/LICENSE b/LICENSE
index 44cf2b30e68..81a8e1e4739 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2018 Sébastien Eustace
+Copyright (c) 2018-present Sébastien Eustace
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/docs/dependency-specification.md b/docs/dependency-specification.md
index b841d68bc10..3e7f55f755f 100644
--- a/docs/dependency-specification.md
+++ b/docs/dependency-specification.md
@@ -247,7 +247,7 @@ for extras in your project refer to [`extras`]({{< relref "pyproject#extras" >}}
 
 ## `source` dependencies
 
-To depend on a package from an [alternate repository]({{< relref "repositories/#install-dependencies-from-a-private-repository" >}}),
+To depend on a package from an [alternate repository]({{< relref "repositories#installing-from-private-package-sources" >}}),
 you can use the `source` property:
 
 ```toml
@@ -267,7 +267,7 @@ poetry add my-cool-package --source foo
 ```
 
 {{% note %}}
-In this example, we expect `foo` to be configured correctly. See [using a private repository](repositories.md#using-a-private-repository)
+In this example, we expect `foo` to be configured correctly. See [using a private repository]({{< relref "repositories#installing-from-private-package-sources" >}})
 for further information.
 {{% /note %}}
 
diff --git a/src/poetry/factory.py b/src/poetry/factory.py
index 46856736354..c20f224272c 100644
--- a/src/poetry/factory.py
+++ b/src/poetry/factory.py
@@ -257,7 +257,8 @@ def create_pyproject_from_package(
                     constraint["optional"] = True
 
                 if len(constraint) == 1 and "version" in constraint:
-                    constraint = cast(str, constraint["version"])
+                    assert isinstance(constraint["version"], str)
+                    constraint = constraint["version"]
                 elif not constraint:
                     constraint = "*"
 
diff --git a/src/poetry/installation/executor.py b/src/poetry/installation/executor.py
index 2dc53d53016..e831d4d0d34 100644
--- a/src/poetry/installation/executor.py
+++ b/src/poetry/installation/executor.py
@@ -13,7 +13,6 @@
 from subprocess import CalledProcessError
 from typing import TYPE_CHECKING
 from typing import Any
-from typing import cast
 
 from cleo.io.null_io import NullIO
 from poetry.core.packages.file_dependency import FileDependency
@@ -771,7 +770,8 @@ def _save_url_reference(self, operation: Operation) -> None:
             for dist in self._env.site_packages.distributions(
                 name=package.name, writable_only=True
             ):
-                dist_path = cast(Path, dist._path)  # type: ignore[attr-defined]
+                dist_path = dist._path  # type: ignore[attr-defined]
+                assert isinstance(dist_path, Path)
                 url = dist_path / "direct_url.json"
                 url.write_text(json.dumps(url_reference), encoding="utf-8")
 
diff --git a/src/poetry/mixology/failure.py b/src/poetry/mixology/failure.py
index f4629aa56c7..448d39786bb 100644
--- a/src/poetry/mixology/failure.py
+++ b/src/poetry/mixology/failure.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 from typing import TYPE_CHECKING
-from typing import cast
 
 from poetry.core.constraints.version import parse_constraint
 
@@ -114,7 +113,8 @@ def _visit(
         conjunction = "So," if conclusion or incompatibility == self._root else "And"
         incompatibility_string = str(incompatibility)
 
-        cause: ConflictCause = cast(ConflictCause, incompatibility.cause)
+        cause = incompatibility.cause
+        assert isinstance(cause, ConflictCause)
 
         if isinstance(cause.conflict.cause, ConflictCause) and isinstance(
             cause.other.cause, ConflictCause
@@ -198,7 +198,8 @@ def _visit(
                     numbered=numbered,
                 )
             elif self._is_collapsible(derived):
-                derived_cause: ConflictCause = cast(ConflictCause, derived.cause)
+                derived_cause = derived.cause
+                assert isinstance(derived_cause, ConflictCause)
                 if isinstance(derived_cause.conflict.cause, ConflictCause):
                     collapsed_derived = derived_cause.conflict
                     collapsed_ext = derived_cause.other
@@ -233,7 +234,8 @@ def _is_collapsible(self, incompatibility: Incompatibility) -> bool:
         if self._derivations[incompatibility] > 1:
             return False
 
-        cause: ConflictCause = cast(ConflictCause, incompatibility.cause)
+        cause = incompatibility.cause
+        assert isinstance(cause, ConflictCause)
         if isinstance(cause.conflict.cause, ConflictCause) and isinstance(
             cause.other.cause, ConflictCause
         ):
diff --git a/src/poetry/utils/env.py b/src/poetry/utils/env.py
index d76972ca50d..7de0d60d2bc 100644
--- a/src/poetry/utils/env.py
+++ b/src/poetry/utils/env.py
@@ -451,12 +451,6 @@ def find(
             if value[-1] is True
         ]
 
-    def __getattr__(self, item: str) -> Any:
-        try:
-            return super().__getattribute__(item)
-        except AttributeError:
-            return getattr(self.path, item)
-
 
 class EnvError(Exception):
     pass
diff --git a/src/poetry/utils/helpers.py b/src/poetry/utils/helpers.py
index b50d9e9acfc..c4ef660d547 100644
--- a/src/poetry/utils/helpers.py
+++ b/src/poetry/utils/helpers.py
@@ -12,7 +12,6 @@
 from typing import Any
 from typing import Iterator
 from typing import Mapping
-from typing import cast
 
 from poetry.utils.constants import REQUESTS_TIMEOUT
 
@@ -189,7 +188,8 @@ def _get_win_folder_from_registry(csidl_name: str) -> str:
     )
     dir, type = _winreg.QueryValueEx(key, shell_folder_name)
 
-    return cast(str, dir)
+    assert isinstance(dir, str)
+    return dir
 
 
 def _get_win_folder_with_ctypes(csidl_name: str) -> str: