diff --git a/charmcraft/application/commands/analyse.py b/charmcraft/application/commands/analyse.py
index 8b160efe8..922b13fb6 100644
--- a/charmcraft/application/commands/analyse.py
+++ b/charmcraft/application/commands/analyse.py
@@ -69,13 +69,13 @@ def run(self, parsed_args: argparse.Namespace) -> int:
             return self._run_formatted(parsed_args.filepath, ignore=ignore)
         return self._run_streaming(parsed_args.filepath, ignore=ignore)
 
-    def _run_formatted(self, filepath: pathlib.Path, *, ignore=Container[str]) -> int:
+    def _run_formatted(self, filepath: pathlib.Path, *, ignore: Container[str]) -> int:
         """Run the command, formatting the output into JSON or similar at the end."""
         results = list(self._services.analysis.lint_file(filepath))
         emit.message(json.dumps(results, indent=4, default=pydantic_encoder))
         return max(r.level for r in results).return_code
 
-    def _run_streaming(self, filepath: pathlib.Path, *, ignore=Container[str]) -> int:
+    def _run_streaming(self, filepath: pathlib.Path, *, ignore: Container[str]) -> int:
         """Run the command, printing linter results as we get them."""
         max_level = lint.ResultLevel.OK
         with emit.progress_bar(
diff --git a/charmcraft/application/commands/store.py b/charmcraft/application/commands/store.py
index f9c7b53c4..469f0d2cf 100644
--- a/charmcraft/application/commands/store.py
+++ b/charmcraft/application/commands/store.py
@@ -281,7 +281,7 @@ def run(self, parsed_args: argparse.Namespace) -> None:
             for package_type, title in [("charm", "charms"), ("bundle", "bundles")]:
                 if package_type in grouped:
                     human_msgs.append(f"{title}:")
-                    pkg_info = []
+                    pkg_info: list[dict[str, str]] = []
                     for item in grouped[package_type]:
                         if (name := item.get("name")) is not None:
                             human_msgs.append(f"- name: {name}")
diff --git a/charmcraft/charm_builder.py b/charmcraft/charm_builder.py
index 47bd9c943..bedc62d7d 100644
--- a/charmcraft/charm_builder.py
+++ b/charmcraft/charm_builder.py
@@ -60,7 +60,6 @@ def __init__(
         builddir: pathlib.Path,
         installdir: pathlib.Path,
         entrypoint: pathlib.Path,
-        allow_pip_binary: bool = None,
         binary_python_packages: list[str] | None = None,
         python_packages: list[str] | None = None,
         requirements: list[pathlib.Path] | None = None,
@@ -69,7 +68,6 @@ def __init__(
         self.builddir = builddir
         self.installdir = installdir
         self.entrypoint = entrypoint
-        self.allow_pip_binary = allow_pip_binary
         self.binary_python_packages = binary_python_packages or []
         self.python_packages = python_packages or []
         self.requirement_paths = requirements or []
@@ -481,4 +479,4 @@ def main():
 if __name__ == "__main__":
     with instrum.Timer("Full charm_builder.py main"):
         main()
-    instrum.dump(get_charm_builder_metrics_path())
+    instrum.dump(get_charm_builder_metrics_path().as_posix())
diff --git a/charmcraft/extensions/_utils.py b/charmcraft/extensions/_utils.py
index 3a816ad2b..bc0d08011 100644
--- a/charmcraft/extensions/_utils.py
+++ b/charmcraft/extensions/_utils.py
@@ -78,7 +78,7 @@ def _apply_extension(
 
 
 def _apply_extension_property(
-    existing_property: dict | list, extension_property: dict | list
+    existing_property: dict | list | None, extension_property: dict | list
 ) -> dict | list:
     if existing_property:
         # If the property is not scalar, merge them
diff --git a/charmcraft/instrum.py b/charmcraft/instrum.py
index e83bb8578..a3164d62f 100644
--- a/charmcraft/instrum.py
+++ b/charmcraft/instrum.py
@@ -1,4 +1,4 @@
-# Copyright 2022 Canonical Ltd.
+# Copyright 2022,2024 Canonical Ltd.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 """Provide utilities to measure performance in different parts of the app."""
 
 import json
+import pathlib
 import uuid
 from time import time
 from typing import Any
@@ -34,7 +35,7 @@ def __init__(self):
         # ancestors list when a measure starts (last item is direct parent); the
         # first value is special, None, to reflect the "root", the rest are
         # measurement ids
-        self.parents = [None]  # start with a unique "root"
+        self.parents: list[str | None] = [None]  # start with a unique "root"
 
         # simple dict to hold measurements information; the key is the measurement
         # id and each value holds all it info
@@ -74,7 +75,7 @@ def dump(self, filename: str) -> None:
         with open(filename, "w") as fh:
             json.dump(measurements, fh, indent=4)
 
-    def merge_from(self, filename: str) -> None:
+    def merge_from(self, filename: str | pathlib.Path) -> None:
         """Merge measurements from a file to the current ongoing structure."""
         with open(filename) as fh:
             to_merge = json.load(fh)
diff --git a/charmcraft/jujuignore.py b/charmcraft/jujuignore.py
index d715859b3..fec99aea5 100644
--- a/charmcraft/jujuignore.py
+++ b/charmcraft/jujuignore.py
@@ -126,7 +126,7 @@ def __init__(
         orig_rule: str,
         invert: bool,
         only_dirs: bool,
-        regex: typing.Pattern,
+        regex: re.Pattern[str] | str,
     ):
         self.line_num = line_num
         self.orig_rule = orig_rule
diff --git a/charmcraft/models/project.py b/charmcraft/models/project.py
index 9930b612a..f1352b894 100644
--- a/charmcraft/models/project.py
+++ b/charmcraft/models/project.py
@@ -15,6 +15,8 @@
 # For further info, check https://github.com/canonical/charmcraft
 """Project-related models for Charmcraft."""
 
+from __future__ import annotations
+
 import abc
 import datetime
 import pathlib
@@ -433,7 +435,7 @@ def started_at(self) -> datetime.datetime:
         return self._started_at
 
     @classmethod
-    def unmarshal(cls, data: dict[str, Any]):
+    def unmarshal(cls, data: dict[str, Any]) -> CharmcraftProject:
         """Create a Charmcraft project from a dictionary of data."""
         if cls is not CharmcraftProject:
             return cls.model_validate(data)
@@ -447,7 +449,7 @@ def unmarshal(cls, data: dict[str, Any]):
         raise ValueError(f"field type cannot be {project_type!r}")
 
     @classmethod
-    def from_yaml_file(cls, path: pathlib.Path) -> Self:
+    def from_yaml_file(cls, path: pathlib.Path) -> CharmcraftProject:
         """Instantiate this model from a YAML file.
 
         For use with craft-application.
diff --git a/charmcraft/parts/plugins/_charm.py b/charmcraft/parts/plugins/_charm.py
index fcfa4b249..209c2a864 100644
--- a/charmcraft/parts/plugins/_charm.py
+++ b/charmcraft/parts/plugins/_charm.py
@@ -22,6 +22,7 @@
 from contextlib import suppress
 from typing import Literal, cast
 
+import craft_parts
 import overrides
 import pydantic
 from craft_parts import Step, callbacks, plugins
@@ -346,9 +347,10 @@ def _get_legacy_dependencies_parameters(self) -> list[str]:
 
         return parameters
 
-    def post_build_callback(self, step_info):
+    def post_build_callback(self, step_info: craft_parts.StepInfo) -> Literal[False]:
         """Collect metrics left by charm_builder.py."""
         instrum.merge_from(env.get_charm_builder_metrics_path())
+        return False
 
     def _get_os_special_priority_paths(self) -> str | None:
         """Return a str of PATH for special OS."""
diff --git a/charmcraft/store/store.py b/charmcraft/store/store.py
index 2e8517734..c599e5c85 100644
--- a/charmcraft/store/store.py
+++ b/charmcraft/store/store.py
@@ -85,7 +85,7 @@ def _build_errors(item):
 
 def _build_revision(item: dict[str, Any]) -> Revision:
     """Build a Revision from a response item."""
-    bases = [(None if base is None else Base(**base)) for base in item["bases"]]
+    bases = [Base(**base) for base in item["bases"] if base is not None]
     return Revision(
         revision=item["revision"],
         version=item["version"],
@@ -387,7 +387,7 @@ def list_releases(self, name: str) -> tuple[list[Release], list[Channel], list[R
                     channel=item["channel"],
                     expires_at=expires_at,
                     resources=resources,
-                    base=base,
+                    base=base,  # pyright: ignore[reportArgumentType]
                 )
             )
 
diff --git a/charmcraft/utils/cli.py b/charmcraft/utils/cli.py
index 1f1044ec3..539ca6024 100644
--- a/charmcraft/utils/cli.py
+++ b/charmcraft/utils/cli.py
@@ -187,7 +187,7 @@ def format_content(content: dict[str, str], fmt: Literal[OutputFormat.TABLE, "ta
 
 @overload
 def format_content(
-    content: str | (numbers.Real | (list | dict)), fmt: OutputFormat | (str | None)
+    content: str | (numbers.Real | (list | dict)) | None, fmt: OutputFormat | (str | None)
 ) -> str: ...
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 179746404..9ebc1061a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -165,13 +165,11 @@ include = [
     "tests/unit",
     "tests/integration",
 ]
-analyzeUnannotatedFunctions = false
-reportArgumentType = "warning"
+analyzeUnannotatedFunctions = true
 reportAttributeAccessIssue = "warning"
 reportIncompatibleVariableOverride = "warning"
 reportOptionalMemberAccess = "warning"
 
-
 [tool.mypy]
 python_version = "3.10"
 packages = [
@@ -198,17 +196,10 @@ disallow_untyped_decorators = true
 # Ignore typing errors in most legacy packages until we fix them.
 module=[
     "charmcraft.charm_builder",
-    "charmcraft.cmdbase",
-    "charmcraft.commands.extensions",
-    "charmcraft.commands.pack",
-    "charmcraft.commands.store",
-    "charmcraft.store.registry",
     "charmcraft.store.store",
     "charmcraft.extensions._utils",
     "charmcraft.linters",
     "charmcraft.models.charmcraft",
-    "charmcraft.package",
-    "charmcraft.providers",
 ]
 ignore_errors = true
 
diff --git a/tests/factory.py b/tests/factory.py
index a99babc1e..3270b2b96 100644
--- a/tests/factory.py
+++ b/tests/factory.py
@@ -18,11 +18,14 @@
 
 import pathlib
 import textwrap
+from typing import cast
 
 from charmcraft.utils import create_importable_name, get_lib_info
 
 
-def create_lib_filepath(charm_name, lib_name, api=0, patch=1, lib_id="test-lib-id"):
+def create_lib_filepath(
+    charm_name: str, lib_name: str, api: int = 0, patch: int = 1, lib_id: str = "test-lib-id"
+) -> tuple[str, str]:
     """Helper to create the structures on disk for a given lib."""
     charm_name = create_importable_name(charm_name)
     base_dir = pathlib.Path("lib")
@@ -46,4 +49,4 @@ def create_lib_filepath(charm_name, lib_name, api=0, patch=1, lib_id="test-lib-i
     # use get_lib_info to get the hash of the file, as the used hash is WITHOUT the metadata
     # files (no point in duplicating that logic here)
     libdata = get_lib_info(lib_path=lib_file)
-    return content, libdata.content_hash
+    return content, cast(str, libdata.content_hash)
diff --git a/tests/integration/commands/test_init.py b/tests/integration/commands/test_init.py
index a4f632809..c6f42d645 100644
--- a/tests/integration/commands/test_init.py
+++ b/tests/integration/commands/test_init.py
@@ -15,7 +15,6 @@
 # For further info, check https://github.com/canonical/charmcraft
 """Tests for init command."""
 import argparse
-import contextlib
 import os
 import pathlib
 import re
@@ -28,13 +27,14 @@
 import pytest
 import pytest_check
 
-import charmcraft
-from charmcraft import errors
+from charmcraft import application, errors
 from charmcraft.application import commands
 from charmcraft.utils import S_IXALL
 
-with contextlib.suppress(ImportError):
+try:
     import pwd
+except ImportError:
+    pwd = None
 
 BASIC_INIT_FILES = frozenset(
     pathlib.Path(p)
@@ -96,14 +96,14 @@
 
 
 @pytest.fixture
-def init_command():
-    return commands.InitCommand({"app": charmcraft.application.APP_METADATA, "services": None})
+def init_command() -> commands.InitCommand:
+    return commands.InitCommand({"app": application.APP_METADATA, "services": None})
 
 
 def create_namespace(
     *,
     name="my-charm",
-    author="J Doe",
+    author: str | None = "J Doe",
     force=False,
     profile=commands.init.DEFAULT_PROFILE,
     project_dir: pathlib.Path | None = None,
diff --git a/tests/unit/models/test_config.py b/tests/unit/models/test_config.py
index e929d848e..d4ccded5f 100644
--- a/tests/unit/models/test_config.py
+++ b/tests/unit/models/test_config.py
@@ -66,7 +66,7 @@ def test_empty_config():
 def test_correct_option_type(option, type_):
     config = JujuConfig(options={"my-opt": option})
 
-    assert isinstance(config.options["my-opt"], type_)
+    assert isinstance(config.options["my-opt"], type_)  # pyright: ignore[reportOptionalSubscript]
 
 
 @pytest.mark.parametrize(
diff --git a/tests/unit/models/test_metadata.py b/tests/unit/models/test_metadata.py
index 63fdeaa50..43350300e 100644
--- a/tests/unit/models/test_metadata.py
+++ b/tests/unit/models/test_metadata.py
@@ -15,6 +15,7 @@
 # For further info, check https://github.com/canonical/charmcraft
 """Tests for metadata models."""
 import json
+from typing import cast
 
 import pytest
 
@@ -80,7 +81,7 @@
     ],
 )
 def test_charm_metadata_from_charm_success(charm_dict, expected):
-    charm = project.CharmcraftProject.unmarshal(charm_dict)
+    charm = cast(project.Charm, project.CharmcraftProject.unmarshal(charm_dict))
 
     assert json.loads(json.dumps(metadata.CharmMetadata.from_charm(charm).marshal())) == expected
 
@@ -92,7 +93,7 @@ def test_charm_metadata_from_charm_success(charm_dict, expected):
     ],
 )
 def test_bundle_metadata_from_bundle(bundle_dict, expected):
-    bundle = project.Bundle.unmarshal(BASIC_BUNDLE_DICT)
+    bundle = cast(project.Bundle, project.Bundle.unmarshal(BASIC_BUNDLE_DICT))
 
     assert (
         json.loads(json.dumps(metadata.BundleMetadata.from_bundle(bundle).marshal())) == expected
diff --git a/tests/unit/services/test_analysis.py b/tests/unit/services/test_analysis.py
index d3c3d9eb4..cde932c46 100644
--- a/tests/unit/services/test_analysis.py
+++ b/tests/unit/services/test_analysis.py
@@ -99,7 +99,9 @@ def mock_zip_file(monkeypatch):
 
 @pytest.fixture
 def analysis_service():
-    return analysis.AnalysisService(app=application.APP_METADATA, services=None)
+    return analysis.AnalysisService(
+        app=application.APP_METADATA, services=None  # pyright: ignore[reportArgumentType]
+    )
 
 
 @pytest.mark.parametrize(
diff --git a/tests/unit/services/test_package.py b/tests/unit/services/test_package.py
index 9ac506243..5de845534 100644
--- a/tests/unit/services/test_package.py
+++ b/tests/unit/services/test_package.py
@@ -37,9 +37,11 @@
     charmcraft_started_at="1970-01-01T00:00:00+00:00",
     bases=[SIMPLE_BUILD_BASE],
 )
-MANIFEST_WITH_ATTRIBUTE = models.Manifest(
-    **SIMPLE_MANIFEST.marshal(),
-    analysis={"attributes": [models.Attribute(name="boop", result="success")]},
+MANIFEST_WITH_ATTRIBUTE = models.Manifest.unmarshal(
+    {
+        **SIMPLE_MANIFEST.marshal(),
+        "analysis": {"attributes": [models.Attribute(name="boop", result="success")]},
+    },
 )
 
 
diff --git a/tests/unit/services/test_store.py b/tests/unit/services/test_store.py
index 8407d6ce4..178a05867 100644
--- a/tests/unit/services/test_store.py
+++ b/tests/unit/services/test_store.py
@@ -42,7 +42,9 @@ def store(service_factory) -> services.StoreService:
 
 @pytest.fixture(scope="module")
 def reusable_store():
-    store = services.StoreService(app=application.APP_METADATA, services=None)
+    store = services.StoreService(
+        app=application.APP_METADATA, services=None  # pyright: ignore[reportArgumentType]
+    )
     store.client = mock.Mock(spec_set=craft_store.StoreClient)
     return store
 
diff --git a/tests/unit/utils/test_cli.py b/tests/unit/utils/test_cli.py
index 971f36795..3b3e48748 100644
--- a/tests/unit/utils/test_cli.py
+++ b/tests/unit/utils/test_cli.py
@@ -279,4 +279,4 @@ def test_format_content_table(content):
 @pytest.mark.parametrize("fmt", ["yolo", 0])
 def test_format_content_invalid(fmt):
     with pytest.raises(ValueError, match="^Unknown output format "):
-        format_content(None, fmt)
+        format_content(None, fmt)  # pyright: ignore[reportCallIssue]