diff --git a/src/poetry/config/config.py b/src/poetry/config/config.py
index 7cbcba3fc10..5d2e94da367 100644
--- a/src/poetry/config/config.py
+++ b/src/poetry/config/config.py
@@ -128,12 +128,9 @@ class Config:
         "installer": {"parallel": True, "max-workers": None, "no-binary": None},
     }
 
-    def __init__(
-        self, use_environment: bool = True, base_dir: Path | None = None
-    ) -> None:
+    def __init__(self, use_environment: bool = True) -> None:
         self._config = deepcopy(self.default_config)
         self._use_environment = use_environment
-        self._base_dir = base_dir
         self._config_source: ConfigSource = DictConfigSource()
         self._auth_config_source: ConfigSource = DictConfigSource()
 
diff --git a/src/poetry/config/file_config_source.py b/src/poetry/config/file_config_source.py
index 7119fa19911..5297fecf1ef 100644
--- a/src/poetry/config/file_config_source.py
+++ b/src/poetry/config/file_config_source.py
@@ -18,9 +18,8 @@
 
 
 class FileConfigSource(ConfigSource):
-    def __init__(self, file: TOMLFile, auth_config: bool = False) -> None:
+    def __init__(self, file: TOMLFile) -> None:
         self._file = file
-        self._auth_config = auth_config
 
     @property
     def name(self) -> str:
diff --git a/src/poetry/console/commands/command.py b/src/poetry/console/commands/command.py
index 4bc26ad567b..08449727860 100644
--- a/src/poetry/console/commands/command.py
+++ b/src/poetry/console/commands/command.py
@@ -24,9 +24,6 @@ def poetry(self) -> Poetry:
 
         return self._poetry
 
-    def set_poetry(self, poetry: Poetry) -> None:
-        self._poetry = poetry
-
     def get_application(self) -> Application:
         application: Application = self.application
         return application
diff --git a/src/poetry/console/commands/version.py b/src/poetry/console/commands/version.py
index c494879c4df..64011f92fcf 100644
--- a/src/poetry/console/commands/version.py
+++ b/src/poetry/console/commands/version.py
@@ -46,16 +46,6 @@ class VersionCommand(Command):
 patch, minor, major, prepatch, preminor, premajor, prerelease.
 """
 
-    RESERVED = {
-        "major",
-        "minor",
-        "patch",
-        "premajor",
-        "preminor",
-        "prepatch",
-        "prerelease",
-    }
-
     def handle(self) -> int:
         version = self.argument("version")
 
diff --git a/src/poetry/exceptions.py b/src/poetry/exceptions.py
index 0d755667594..68154f8d87d 100644
--- a/src/poetry/exceptions.py
+++ b/src/poetry/exceptions.py
@@ -3,7 +3,3 @@
 
 class PoetryException(Exception):
     pass
-
-
-class InvalidProjectFile(PoetryException):
-    pass
diff --git a/src/poetry/factory.py b/src/poetry/factory.py
index c20f224272c..ff38c7a044c 100644
--- a/src/poetry/factory.py
+++ b/src/poetry/factory.py
@@ -11,7 +11,6 @@
 from cleo.io.null_io import NullIO
 from poetry.core.factory import Factory as BaseFactory
 from poetry.core.packages.dependency_group import MAIN_GROUP
-from poetry.core.packages.project_package import ProjectPackage
 from poetry.core.toml.file import TOMLFile
 
 from poetry.config.config import Config
@@ -100,15 +99,10 @@ def create_poetry(
 
         plugin_manager = PluginManager(Plugin.group, disable_plugins=disable_plugins)
         plugin_manager.load_plugins()
-        poetry.set_plugin_manager(plugin_manager)
         plugin_manager.activate(poetry, io)
 
         return poetry
 
-    @classmethod
-    def get_package(cls, name: str, version: str) -> ProjectPackage:
-        return ProjectPackage(name, version, version)
-
     @classmethod
     def configure_sources(
         cls,
diff --git a/src/poetry/installation/executor.py b/src/poetry/installation/executor.py
index 0a01fee2b98..80434add8aa 100644
--- a/src/poetry/installation/executor.py
+++ b/src/poetry/installation/executor.py
@@ -78,8 +78,6 @@ def __init__(
         self._chooser = Chooser(pool, self._env, config)
 
         self._executor = ThreadPoolExecutor(max_workers=self._max_workers)
-        self._total_operations = 0
-        self._executed_operations = 0
         self._executed = {"install": 0, "update": 0, "uninstall": 0}
         self._skipped = {"install": 0, "update": 0, "uninstall": 0}
         self._sections: dict[int, SectionOutput] = {}
@@ -135,7 +133,6 @@ def pip_install(
         return 0
 
     def execute(self, operations: list[Operation]) -> int:
-        self._total_operations = len(operations)
         for job_type in self._executed:
             self._executed[job_type] = 0
             self._skipped[job_type] = 0
@@ -347,7 +344,6 @@ def _do_execute_operation(self, operation: Operation) -> int:
     def _increment_operations_count(self, operation: Operation, executed: bool) -> None:
         with self._lock:
             if executed:
-                self._executed_operations += 1
                 self._executed[operation.job_type] += 1
             else:
                 self._skipped[operation.job_type] += 1
diff --git a/src/poetry/installation/operations/operation.py b/src/poetry/installation/operations/operation.py
index 816618a1b8d..013929f23f8 100644
--- a/src/poetry/installation/operations/operation.py
+++ b/src/poetry/installation/operations/operation.py
@@ -51,9 +51,3 @@ def skip(self: T, reason: str) -> T:
         self._skip_reason = reason
 
         return self
-
-    def unskip(self: T) -> T:
-        self._skipped = False
-        self._skip_reason = None
-
-        return self
diff --git a/src/poetry/json/__init__.py b/src/poetry/json/__init__.py
index 1e237794380..c3b0e30b8f0 100644
--- a/src/poetry/json/__init__.py
+++ b/src/poetry/json/__init__.py
@@ -14,10 +14,6 @@
 SCHEMA_DIR = os.path.join(os.path.dirname(__file__), "schemas")
 
 
-class ValidationError(ValueError):
-    pass
-
-
 def validate_object(obj: dict[str, Any]) -> list[str]:
     schema_file = Path(SCHEMA_DIR, "poetry.json")
     schema = json.loads(schema_file.read_text(encoding="utf-8"))
diff --git a/src/poetry/poetry.py b/src/poetry/poetry.py
index e9cb6e5db04..d92c52909c1 100644
--- a/src/poetry/poetry.py
+++ b/src/poetry/poetry.py
@@ -7,6 +7,7 @@
 
 from poetry.__version__ import __version__
 from poetry.config.source import Source
+from poetry.repositories.repository_pool import RepositoryPool
 
 
 if TYPE_CHECKING:
@@ -17,7 +18,6 @@
     from poetry.config.config import Config
     from poetry.packages.locker import Locker
     from poetry.plugins.plugin_manager import PluginManager
-    from poetry.repositories.repository_pool import RepositoryPool
 
 
 class Poetry(BasePoetry):
@@ -32,8 +32,6 @@ def __init__(
         config: Config,
         disable_cache: bool = False,
     ) -> None:
-        from poetry.repositories.repository_pool import RepositoryPool
-
         super().__init__(file, local_config, package)
 
         self._locker = locker
@@ -73,11 +71,6 @@ def set_config(self, config: Config) -> Poetry:
 
         return self
 
-    def set_plugin_manager(self, plugin_manager: PluginManager) -> Poetry:
-        self._plugin_manager = plugin_manager
-
-        return self
-
     def get_sources(self) -> list[Source]:
         return [
             Source(**source)
diff --git a/src/poetry/repositories/lockfile_repository.py b/src/poetry/repositories/lockfile_repository.py
index 25eff224938..8c09629b877 100644
--- a/src/poetry/repositories/lockfile_repository.py
+++ b/src/poetry/repositories/lockfile_repository.py
@@ -20,13 +20,3 @@ def __init__(self) -> None:
 
     def has_package(self, package: Package) -> bool:
         return any(p == package for p in self.packages)
-
-    def remove_package(self, package: Package) -> None:
-        index = None
-        for i, repo_package in enumerate(self.packages):
-            if repo_package == package:
-                index = i
-                break
-
-        if index is not None:
-            del self._packages[index]
diff --git a/src/poetry/repositories/repository.py b/src/poetry/repositories/repository.py
index 46ecaac7475..6f6b53ebb9d 100644
--- a/src/poetry/repositories/repository.py
+++ b/src/poetry/repositories/repository.py
@@ -73,18 +73,6 @@ def has_package(self, package: Package) -> bool:
     def add_package(self, package: Package) -> None:
         self._packages.append(package)
 
-    def remove_package(self, package: Package) -> None:
-        package_id = package.unique_name
-
-        index = None
-        for i, repo_package in enumerate(self.packages):
-            if package_id == repo_package.unique_name:
-                index = i
-                break
-
-        if index is not None:
-            del self._packages[index]
-
     def search(self, query: str) -> list[Package]:
         results: list[Package] = []
 
diff --git a/src/poetry/utils/authenticator.py b/src/poetry/utils/authenticator.py
index 8db92913043..933a45e26e7 100644
--- a/src/poetry/utils/authenticator.py
+++ b/src/poetry/utils/authenticator.py
@@ -95,10 +95,6 @@ def __post_init__(self) -> None:
     def certs(self, config: Config) -> RepositoryCertificateConfig:
         return RepositoryCertificateConfig.create(self.name, config)
 
-    @property
-    def http_credential_keys(self) -> list[str]:
-        return [self.url, self.netloc, self.name]
-
     def get_http_credentials(
         self, password_manager: PasswordManager, username: str | None = None
     ) -> HTTPAuthCredential:
diff --git a/src/poetry/utils/env.py b/src/poetry/utils/env.py
index 4c60cf9e46c..bb9c2ec16ff 100644
--- a/src/poetry/utils/env.py
+++ b/src/poetry/utils/env.py
@@ -239,7 +239,6 @@ def __init__(
             self._platlib = purelib
 
         self._fallbacks = fallbacks or []
-        self._skip_write_checks = skip_write_checks
 
         self._candidates: list[Path] = []
         for path in itertools.chain([self._purelib, self._platlib], self._fallbacks):
@@ -1417,12 +1416,6 @@ def get_base_prefix(cls) -> Path:
 
         return Path(sys.prefix)
 
-    def get_version_info(self) -> tuple[Any, ...]:
-        raise NotImplementedError()
-
-    def get_python_implementation(self) -> str:
-        raise NotImplementedError()
-
     def get_marker_env(self) -> dict[str, Any]:
         raise NotImplementedError()
 
@@ -1589,12 +1582,6 @@ def python(self) -> str:
     def sys_path(self) -> list[str]:
         return sys.path
 
-    def get_version_info(self) -> tuple[Any, ...]:
-        return tuple(sys.version_info)
-
-    def get_python_implementation(self) -> str:
-        return platform.python_implementation()
-
     def get_paths(self) -> dict[str, str]:
         # We can't use sysconfig.get_paths() because
         # on some distributions it does not return the proper paths
@@ -1696,16 +1683,6 @@ def sys_path(self) -> list[str]:
         paths: list[str] = json.loads(output)
         return paths
 
-    def get_version_info(self) -> tuple[Any, ...]:
-        output = self.run_python_script(GET_PYTHON_VERSION)
-        assert isinstance(output, str)
-
-        return tuple(int(s) for s in output.strip().split("."))
-
-    def get_python_implementation(self) -> str:
-        implementation: str = self.marker_env["platform_python_implementation"]
-        return implementation
-
     def get_supported_tags(self) -> list[Tag]:
         output = self.run_python_script(GET_SYS_TAGS)
         assert isinstance(output, str)
diff --git a/src/poetry/utils/password_manager.py b/src/poetry/utils/password_manager.py
index 53c42910ba7..a8b84ac6891 100644
--- a/src/poetry/utils/password_manager.py
+++ b/src/poetry/utils/password_manager.py
@@ -13,10 +13,6 @@
 logger = logging.getLogger(__name__)
 
 
-class PasswordManagerError(Exception):
-    pass
-
-
 class PoetryKeyringError(Exception):
     pass
 
diff --git a/tests/repositories/test_lockfile_repository.py b/tests/repositories/test_lockfile_repository.py
index 200a48f5bb7..82e136a1bff 100644
--- a/tests/repositories/test_lockfile_repository.py
+++ b/tests/repositories/test_lockfile_repository.py
@@ -30,31 +30,3 @@ def test_has_package():
     assert repo.has_package(deepcopy(url_package))
     assert repo.has_package(deepcopy(pypi_package))
     assert repo.has_package(deepcopy(url_package_2))
-
-
-def test_remove_package():
-    url_package = Package(
-        "a", "1.0", source_type="url", source_url="https://example.org/a.whl"
-    )
-    pypi_package = Package("a", "1.0")
-    url_package_2 = Package(
-        "a", "1.0", source_type="url", source_url="https://example.org/a-1.whl"
-    )
-
-    repo = LockfileRepository()
-    repo.add_package(url_package)
-    repo.add_package(pypi_package)
-    repo.add_package(url_package_2)
-
-    assert len(repo.packages) == 3
-
-    repo.remove_package(deepcopy(pypi_package))
-    assert len(repo.packages) == 2
-    repo.remove_package(pypi_package)
-    assert len(repo.packages) == 2
-
-    repo.remove_package(deepcopy(url_package_2))
-    assert len(repo.packages) == 1
-    assert repo.packages[0] == url_package
-    repo.remove_package(url_package_2)
-    assert len(repo.packages) == 1