diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 248a7d9..4f79752 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,7 +13,7 @@ repos:
       - id: check-yaml
         files: .*\.(yaml|yml)$
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.7
+    rev: v0.14.8
     hooks:
       - id: ruff-check
         args: ['--fix', '--unsafe-fixes']
diff --git a/oslo_upgradecheck/_i18n.py b/oslo_upgradecheck/_i18n.py
index 9404346..be5e04b 100644
--- a/oslo_upgradecheck/_i18n.py
+++ b/oslo_upgradecheck/_i18n.py
@@ -30,5 +30,5 @@ _C = _translators.contextual_form
 _P = _translators.plural_form
 
 
-def get_available_languages():
+def get_available_languages() -> list[str]:
     return oslo_i18n.get_available_languages(DOMAIN)
diff --git a/oslo_upgradecheck/common_checks.py b/oslo_upgradecheck/common_checks.py
index 1fb2fdd..3bd92dc 100644
--- a/oslo_upgradecheck/common_checks.py
+++ b/oslo_upgradecheck/common_checks.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_policy import opts as policy_opts
+from oslo_config import cfg  # type: ignore
+from oslo_policy import opts as policy_opts  # type: ignore
 from oslo_utils import fileutils
 
 from oslo_upgradecheck import upgradecheck
@@ -20,7 +21,9 @@ Common checks which can be used by multiple services.
 """
 
 
-def check_policy_json(self, conf):
+def check_policy_json(
+    self: upgradecheck.UpgradeCommands, conf: cfg.ConfigOpts
+) -> upgradecheck.Result:
     "Checks to see if policy file is JSON-formatted policy file."
 
     # NOTE(gmann): This method need [oslo_policy].policy_file
diff --git a/oslo_upgradecheck/tests/test_common_checks.py b/oslo_upgradecheck/tests/test_common_checks.py
index 8795fbb..04bc82f 100644
--- a/oslo_upgradecheck/tests/test_common_checks.py
+++ b/oslo_upgradecheck/tests/test_common_checks.py
@@ -15,11 +15,11 @@ import os.path
 import tempfile
 import yaml
 
-from oslo_config import cfg
+from oslo_config import cfg  # type: ignore
 from oslo_config import fixture as config
-from oslo_policy import opts as policy_opts
-from oslo_serialization import jsonutils
-from oslotest import base
+from oslo_policy import opts as policy_opts  # type: ignore
+from oslo_serialization import jsonutils  # type: ignore
+from oslotest import base  # type: ignore
 
 from oslo_upgradecheck import common_checks
 from oslo_upgradecheck import upgradecheck
diff --git a/oslo_upgradecheck/tests/test_upgradecheck.py b/oslo_upgradecheck/tests/test_upgradecheck.py
index 784e366..cafdff3 100644
--- a/oslo_upgradecheck/tests/test_upgradecheck.py
+++ b/oslo_upgradecheck/tests/test_upgradecheck.py
@@ -22,8 +22,8 @@ import subprocess
 import sys
 from unittest import mock
 
-from oslo_config import cfg
-from oslotest import base
+from oslo_config import cfg  # type: ignore
+from oslotest import base  # type: ignore
 
 from oslo_upgradecheck import upgradecheck
 
@@ -54,8 +54,13 @@ class TestCommands(upgradecheck.UpgradeCommands):
     )
 
 
-class SuccessCommands(TestCommands):
-    _upgrade_checks = ()
+class SuccessCommands(upgradecheck.UpgradeCommands):
+    def success(self):
+        return upgradecheck.Result(
+            upgradecheck.Code.SUCCESS, 'Always succeeds'
+        )
+
+    _upgrade_checks = (('always succeeds', success),)
 
 
 class TestUpgradeCommands(base.BaseTestCase):
diff --git a/oslo_upgradecheck/upgradecheck.py b/oslo_upgradecheck/upgradecheck.py
index 68f8a1b..3ecb2ca 100644
--- a/oslo_upgradecheck/upgradecheck.py
+++ b/oslo_upgradecheck/upgradecheck.py
@@ -13,18 +13,20 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from collections.abc import Callable, Iterable
 import json
 import sys
 import textwrap
 import traceback
+from typing import Any, TypedDict
 
 import enum
-from oslo_config import cfg
+from oslo_config import cfg  # type: ignore
 import prettytable
 
 from oslo_upgradecheck._i18n import _
 
-CONF = None
+CONF: cfg.ConfigOpts | None = None
 
 
 class Code(enum.IntEnum):
@@ -59,12 +61,23 @@ class Result:
     information on what issue was discovered along with any remediation.
     """
 
-    def __init__(self, code, details=None):
+    def __init__(self, code: Code, details: str | None = None) -> None:
         super().__init__()
         self.code = code
         self.details = details
 
 
+class _OutputCheck(TypedDict):
+    check: str
+    result: Code
+    details: str | None
+
+
+class _Output(TypedDict):
+    name: str
+    checks: list[_OutputCheck]
+
+
 class UpgradeCommands:
     """Base class for upgrade checks
 
@@ -79,18 +92,27 @@ class UpgradeCommands:
     """
 
     display_title = _('Upgrade Check Results')
-    _upgrade_checks = ()
+    _upgrade_checks: tuple[
+        tuple[
+            str,
+            Callable[..., Result]
+            | tuple[Callable[..., Result], dict[str, Any]],
+        ],
+        ...,
+    ] = ()
 
-    def _get_details(self, upgrade_check_result):
-        if upgrade_check_result.details is not None:
-            # wrap the text on the details to 60 characters
-            return '\n'.join(
-                textwrap.wrap(
-                    upgrade_check_result.details, 60, subsequent_indent='  '
-                )
+    def _get_details(self, upgrade_check_result: Result) -> str | None:
+        if upgrade_check_result.details is None:
+            return None
+
+        # wrap the text on the details to 60 characters
+        return '\n'.join(
+            textwrap.wrap(
+                upgrade_check_result.details, 60, subsequent_indent='  '
             )
+        )
 
-    def check(self):
+    def check(self) -> Code:
         """Performs checks to see if the deployment is ready for upgrade.
 
         These checks are expected to be run BEFORE services are restarted with
@@ -130,14 +152,15 @@ class UpgradeCommands:
         # Since registering opts can be overridden by consuming code, we can't
         # assume that our locally defined option exists.
         if (
-            hasattr(CONF, 'command')
+            CONF is not None
+            and hasattr(CONF, 'command')
             and hasattr(CONF.command, 'json')
             and CONF.command.json
         ):
             # NOTE(bnemec): We use str on the translated string to
             # force immediate translation if lazy translation is in use.
             # See lp1801761 for details.
-            output = {'name': str(self.display_title), 'checks': []}
+            output: _Output = {'name': str(self.display_title), 'checks': []}
             for name, result in check_results:
                 output['checks'].append(
                     {
@@ -169,7 +192,9 @@ class UpgradeCommands:
         return return_code
 
 
-def register_cli_options(conf, upgrade_command):
+def register_cli_options(
+    conf: cfg.ConfigOpts, upgrade_command: UpgradeCommands
+) -> None:
     """Set up the command line options.
 
     Adds a subcommand to support 'upgrade check' on the command line.
@@ -179,7 +204,7 @@ def register_cli_options(conf, upgrade_command):
     :param upgrade_command: The UpgradeCommands instance.
     """
 
-    def add_parsers(subparsers):
+    def add_parsers(subparsers: Any) -> None:
         upgrade_action = subparsers.add_parser('upgrade')
         upgrade_action.add_argument('check')
         upgrade_action.set_defaults(action_fn=upgrade_command.check)
@@ -194,14 +219,14 @@ def register_cli_options(conf, upgrade_command):
     conf.register_cli_opt(opt)
 
 
-def run(conf):
+def run(conf: cfg.ConfigOpts) -> int:
     """Run the requested command.
 
     :param conf: An oslo.confg ConfigOpts instance on which the upgrade
                  commands have been previously registered.
     """
     try:
-        return conf.command.action_fn()
+        return conf.command.action_fn()  # type: ignore
     except Exception:
         print(_('Error:\n%s') % traceback.format_exc())
         # This is 255 so it's not confused with the upgrade check exit codes.
@@ -209,12 +234,12 @@ def run(conf):
 
 
 def main(
-    conf,
-    project,
-    upgrade_command,
-    argv=sys.argv[1:],
-    default_config_files=None,
-):
+    conf: cfg.ConfigOpts,
+    project: str,
+    upgrade_command: UpgradeCommands,
+    argv: list[str] = sys.argv[1:],
+    default_config_files: Iterable[str] | None = None,
+) -> int:
     """Simple implementation of main for upgrade checks
 
     This can be used in upgrade check commands to provide the minimum
diff --git a/pyproject.toml b/pyproject.toml
index a70f925..cb81f61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,20 @@ packages = [
     "oslo_upgradecheck"
 ]
 
+[tool.mypy]
+python_version = "3.10"
+show_column_numbers = true
+show_error_context = true
+strict = true
+exclude = '(?x)(doc | examples | releasenotes)'
+
+[[tool.mypy.overrides]]
+module = ["oslo_upgradecheck.tests.*"]
+disallow_untyped_calls = false
+disallow_untyped_defs = false
+disallow_subclassing_any = false
+disallow_any_generics = false
+
 [tool.ruff]
 line-length = 79
 
diff --git a/tox.ini b/tox.ini
index 87fdfad..f89d108 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,11 +15,25 @@ deps =
 commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
+description =
+  Run style checks.
 skip_install = true
 deps =
   pre-commit
+  {[testenv:mypy]deps}
 commands =
   pre-commit run -a
+  {[testenv:mypy]commands}
+
+[testenv:mypy]
+description =
+  Run type checks.
+deps =
+  {[testenv]deps}
+  mypy
+  types-PyYAML
+commands =
+  mypy --cache-dir="{envdir}/mypy_cache" {posargs:oslo_upgradecheck}
 
 [testenv:venv]
 commands = {posargs}