diff --git a/src/poetry/config/config.py b/src/poetry/config/config.py
index 6d7658645ae..772ca528a72 100644
--- a/src/poetry/config/config.py
+++ b/src/poetry/config/config.py
@@ -135,12 +135,9 @@ class Config:
         },
     }
 
-    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 0f7c2a71605..eed4cd053ca 100644
--- a/src/poetry/config/file_config_source.py
+++ b/src/poetry/config/file_config_source.py
@@ -19,9 +19,8 @@
 
 
 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 2aba4e6be24..b4fc2fda0e8 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:
         from poetry.console.application import Application
 
diff --git a/src/poetry/console/commands/version.py b/src/poetry/console/commands/version.py
index 0af2a004719..02c7c66bcbb 100644
--- a/src/poetry/console/commands/version.py
+++ b/src/poetry/console/commands/version.py
@@ -48,16 +48,6 @@ 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 828ce26bc24..d6745ee5bcc 100644
--- a/src/poetry/factory.py
+++ b/src/poetry/factory.py
@@ -12,7 +12,6 @@
 from packaging.utils import canonicalize_name
 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.config.config import Config
 from poetry.exceptions import PoetryException
@@ -102,15 +101,10 @@ 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)
-
     @classmethod
     def create_pool(
         cls,
diff --git a/src/poetry/installation/executor.py b/src/poetry/installation/executor.py
index a0ebcbcf910..23d807c21ed 100644
--- a/src/poetry/installation/executor.py
+++ b/src/poetry/installation/executor.py
@@ -87,8 +87,6 @@ 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] = {}
@@ -151,7 +149,6 @@ 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
@@ -410,7 +407,6 @@ 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 de4f1789866..5b02eb304c2 100644
--- a/src/poetry/json/__init__.py
+++ b/src/poetry/json/__init__.py
@@ -14,10 +14,6 @@
 SCHEMA_DIR = Path(__file__).parent / "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 dfbe043594c..8869845d852 100644
--- a/src/poetry/poetry.py
+++ b/src/poetry/poetry.py
@@ -85,11 +85,6 @@ 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 5211a4a204b..1f6aef2ff7c 100644
--- a/src/poetry/repositories/repository.py
+++ b/src/poetry/repositories/repository.py
@@ -69,18 +69,6 @@ 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 23b52df97dc..0808bf44ce3 100644
--- a/src/poetry/utils/authenticator.py
+++ b/src/poetry/utils/authenticator.py
@@ -77,10 +77,6 @@ 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/base_env.py b/src/poetry/utils/env/base_env.py
index eb8dac6cf97..43f2d7fedd7 100644
--- a/src/poetry/utils/env/base_env.py
+++ b/src/poetry/utils/env/base_env.py
@@ -270,12 +270,6 @@ 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()
 
diff --git a/src/poetry/utils/env/site_packages.py b/src/poetry/utils/env/site_packages.py
index f91caf267e5..844d63936ce 100644
--- a/src/poetry/utils/env/site_packages.py
+++ b/src/poetry/utils/env/site_packages.py
@@ -32,7 +32,6 @@ 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):
diff --git a/src/poetry/utils/env/system_env.py b/src/poetry/utils/env/system_env.py
index e088e684480..0a548a194e5 100644
--- a/src/poetry/utils/env/system_env.py
+++ b/src/poetry/utils/env/system_env.py
@@ -31,12 +31,6 @@ def python(self) -> Path:
     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]:
         import site
 
diff --git a/src/poetry/utils/env/virtual_env.py b/src/poetry/utils/env/virtual_env.py
index c8a81153f66..a378daf79ae 100644
--- a/src/poetry/utils/env/virtual_env.py
+++ b/src/poetry/utils/env/virtual_env.py
@@ -19,7 +19,6 @@
 from poetry.utils.env.script_strings import GET_BASE_PREFIX
 from poetry.utils.env.script_strings import GET_ENVIRONMENT_INFO
 from poetry.utils.env.script_strings import GET_PATHS
-from poetry.utils.env.script_strings import GET_PYTHON_VERSION
 from poetry.utils.env.script_strings import GET_SYS_PATH
 from poetry.utils.env.script_strings import GET_SYS_TAGS
 from poetry.utils.env.system_env import SystemEnv
@@ -51,16 +50,6 @@ 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)
 
diff --git a/src/poetry/utils/password_manager.py b/src/poetry/utils/password_manager.py
index 166386f4565..a7177e5b3d1 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 ae65b682891..5ffdfbe5783 100644
--- a/tests/repositories/test_lockfile_repository.py
+++ b/tests/repositories/test_lockfile_repository.py
@@ -37,25 +37,3 @@ def test_has_package(packages: list[Package]) -> None:
     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(packages: list[Package]) -> None:
-    url_package, pypi_package, url_package_2 = packages
-
-    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