diff --git a/Makefile b/Makefile
index 01bc03c44..fe3439e84 100644
--- a/Makefile
+++ b/Makefile
@@ -43,6 +43,7 @@ tests: .install-poetry
 	poetry run black --check --diff ocpp tests
 	poetry run isort --check-only ocpp tests
 	poetry run flake8 ocpp tests
+	poetry run mypy --strict ocpp/
 	poetry run py.test -vvv --cov=ocpp --cov-report=term-missing tests/
 
 build: .install-poetry
diff --git a/ocpp/_types.py b/ocpp/_types.py
new file mode 100644
index 000000000..939077b3c
--- /dev/null
+++ b/ocpp/_types.py
@@ -0,0 +1,12 @@
+from typing import Any, Callable, Literal, TypedDict
+
+OCPPVersion = Literal["1.6", "2.0", "2.0.1", "2.1"]
+
+
+Handler = Callable[..., Any]
+
+
+class Route(TypedDict, total=False):
+    _on_action: Handler
+    _after_action: Handler
+    _skip_schema_validation: bool
diff --git a/ocpp/charge_point.py b/ocpp/charge_point.py
index f01637d46..ff0ad4503 100644
--- a/ocpp/charge_point.py
+++ b/ocpp/charge_point.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import asyncio
 import inspect
 import logging
@@ -5,16 +7,48 @@
 import time
 import uuid
 from dataclasses import Field, asdict, is_dataclass
-from typing import Any, Dict, List, Optional, Union, get_args, get_origin
+from types import ModuleType
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Dict,
+    List,
+    NoReturn,
+    Optional,
+    Protocol,
+    TypeGuard,
+    Union,
+    get_args,
+    get_origin,
+    overload,
+)
 from urllib.parse import urlparse
 
+from ocpp._types import OCPPVersion, Route
 from ocpp.exceptions import NotImplementedError, NotSupportedError, OCPPError
-from ocpp.messages import Call, MessageType, unpack, validate_payload
+from ocpp.messages import (
+    Call,
+    CallError,
+    CallResult,
+    MessageType,
+    unpack,
+    validate_payload,
+)
 from ocpp.routing import create_route_map
 
+if TYPE_CHECKING:
+    from _typeshed import DataclassInstance
+
+
 LOGGER = logging.getLogger("ocpp")
 
 
+class WebSocket(Protocol):
+    async def recv(self) -> Union[str, bytes]: ...
+    async def send(self, payload: Any) -> None: ...
+
+
 def extract_charge_point_id(path: Optional[str]) -> Optional[str]:
     """Extract the charge point ID from a WebSocket URL path.
 
@@ -60,7 +94,19 @@ def extract_charge_point_id(path: Optional[str]) -> Optional[str]:
     return charge_point_id
 
 
-def camel_to_snake_case(data):
+@overload
+def camel_to_snake_case(data: Dict[str, Any]) -> Dict[str, Any]: ...
+
+
+@overload
+def camel_to_snake_case(data: List[Any]) -> List[Any]: ...
+
+
+@overload
+def camel_to_snake_case(data: DataclassInstance) -> Dict[str, Any]: ...
+
+
+def camel_to_snake_case(data: Any) -> Any:
     """
     Convert all keys of all dictionaries inside the given argument from
     camelCase to snake_case.
@@ -90,7 +136,17 @@ def camel_to_snake_case(data):
     return data
 
 
-def snake_to_camel_case(data):
+@overload
+def snake_to_camel_case(data: Dict[str, Any]) -> Dict[str, Any]: ...
+
+
+@overload
+def snake_to_camel_case(data: List[Any]) -> List[Any]: ...
+
+
+def snake_to_camel_case(
+    data: Union[Dict[str, Any], List[Any]],
+) -> Union[Dict[str, Any], List[Any]]:
     """
     Convert all keys of all dictionaries inside given argument from
     snake_case to camelCase.
@@ -127,12 +183,12 @@ def snake_to_camel_case(data):
     return data
 
 
-def _is_dataclass_instance(input: Any) -> bool:
+def _is_dataclass_instance(input: Any) -> TypeGuard[DataclassInstance]:
     """Verify if given `input` is a dataclass."""
     return is_dataclass(input) and not isinstance(input, type)
 
 
-def _is_optional_field(field: Field) -> bool:
+def _is_optional_field(field: Field[Any]) -> bool:
     """Verify if given `field` allows `None` as value.
 
     The fields `schema` and `host` on the following class would return `False`.
@@ -149,7 +205,7 @@ class URL:
     return get_origin(field.type) is Union and type(None) in get_args(field.type)
 
 
-def serialize_as_dict(dataclass):
+def serialize_as_dict(dataclass: DataclassInstance) -> Dict[str, Any]:
     """Serialize the given `dataclass` as a `dict` recursively.
 
     @dataclass
@@ -194,7 +250,17 @@ class StatusInfoType:
     return serialized
 
 
-def remove_nones(data: Union[List, Dict]) -> Union[List, Dict]:
+@overload
+def remove_nones(data: List[Any]) -> List[Any]: ...
+
+
+@overload
+def remove_nones(data: Dict[str, Any]) -> Dict[str, Any]: ...
+
+
+def remove_nones(
+    data: Union[List[Any], Dict[str, Any]],
+) -> Union[List[Any], Dict[str, Any]]:
     if isinstance(data, dict):
         return {k: remove_nones(v) for k, v in data.items() if v is not None}
 
@@ -204,7 +270,7 @@ def remove_nones(data: Union[List, Dict]) -> Union[List, Dict]:
     return data
 
 
-def _raise_key_error(action, version):
+def _raise_key_error(action: str, version: OCPPVersion) -> NoReturn | None:
     """
     Checks whether a keyerror returned by _handle_call
     is supported by the OCPP version or is simply
@@ -236,7 +302,7 @@ def _raise_key_error(action, version):
                 details={"cause": f"{action} not supported by OCPP{version}."}
             )
 
-    return
+    return None
 
 
 class ChargePoint:
@@ -245,14 +311,24 @@ class ChargePoint:
     initiated and received by the Central System
     """
 
-    def __init__(self, id, connection, response_timeout=30, logger=LOGGER):
+    _call: ModuleType
+    _call_result: ModuleType
+    _ocpp_version: OCPPVersion
+
+    def __init__(
+        self,
+        id: str,
+        connection: WebSocket,
+        response_timeout: float = 30.0,
+        logger: logging.Logger = LOGGER,
+    ):
         """
 
         Args:
 
             charger_id (str): ID of the charger.
             connection: Connection to CP.
-            response_timeout (int): When no response on a request is received
+            response_timeout (float): When no response on a request is received
                 within this interval, a asyncio.TimeoutError is raised.
             logger: Optional Logger instance used for logging.
                 By default, the 'ocpp' logger is used.
@@ -273,28 +349,30 @@ def __init__(self, id, connection, response_timeout=30, logger=LOGGER):
         # if exists.
         self.route_map = create_route_map(self)
 
-        self._call_lock = asyncio.Lock()
+        self._call_lock: asyncio.Lock = asyncio.Lock()
 
         # A queue used to pass CallResults and CallErrors from
         # the self.serve() task to the self.call() task.
-        self._response_queue = asyncio.Queue()
+        self._response_queue: asyncio.Queue[Union[Call, CallResult, CallError]] = (
+            asyncio.Queue()
+        )
 
         # Function used to generate unique ids for CALLs. By default
         # uuid.uuid4() is used, but it can be changed. This is meant primarily
         # for testing purposes to have predictable unique ids.
-        self._unique_id_generator = uuid.uuid4
+        self._unique_id_generator: Callable[[], uuid.UUID] = uuid.uuid4
 
         # The logger used to log messages
         self.logger = logger
 
-    async def start(self):
+    async def start(self) -> NoReturn:
         while True:
             message = await self._connection.recv()
             self.logger.debug("%s: receive message %s", self.id, message)
 
             await self.route_message(message)
 
-    async def route_message(self, raw_msg):
+    async def route_message(self, raw_msg: Union[str, bytes]) -> None:
         """
         Route a message received from a CP.
 
@@ -306,14 +384,14 @@ async def route_message(self, raw_msg):
             msg = unpack(raw_msg)
         except OCPPError as e:
             self.logger.exception(
-                "Unable to parse message: '%s', it doesn't seem "
-                "to be valid OCPP: %s",
+                "Unable to parse message: '%s', it doesn't seem to be valid OCPP: %s",
                 raw_msg,
                 e,
             )
             return
 
         if msg.message_type_id == MessageType.Call:
+            assert isinstance(msg, Call)
             try:
                 await self._handle_call(msg)
             except OCPPError as error:
@@ -322,9 +400,10 @@ async def route_message(self, raw_msg):
                 await self._send(response)
 
         elif msg.message_type_id in [MessageType.CallResult, MessageType.CallError]:
+            assert isinstance(msg, (CallResult, CallError))
             self._response_queue.put_nowait(msg)
 
-    async def _handle_call(self, msg):
+    async def _handle_call(self, msg: Call) -> Any:
         """
         Execute all hooks installed for based on the Action of the message.
 
@@ -337,10 +416,10 @@ async def _handle_call(self, msg):
 
         """
         try:
-            handlers = self.route_map[msg.action]
+            handlers: Route = self.route_map[msg.action]
         except KeyError:
             _raise_key_error(msg.action, self._ocpp_version)
-            return
+            return None
 
         if not handlers.get("_skip_schema_validation", False):
             await validate_payload(msg, self._ocpp_version)
@@ -354,7 +433,7 @@ async def _handle_call(self, msg):
         snake_case_payload = camel_to_snake_case(msg.payload)
 
         try:
-            handler = handlers["_on_action"]
+            handler: Callable[..., Any] = handlers["_on_action"]
         except KeyError:
             _raise_key_error(msg.action, self._ocpp_version)
         handler_signature = inspect.signature(handler)
@@ -373,7 +452,7 @@ async def _handle_call(self, msg):
             response = msg.create_call_error(e).to_json()
             await self._send(response)
 
-            return
+            return None
 
         temp_response_payload = serialize_as_dict(response)
 
@@ -419,9 +498,14 @@ async def _handle_call(self, msg):
         return response
 
     async def call(
-        self, payload, suppress=True, unique_id=None, skip_schema_validation=False
-    ):
+        self,
+        payload: DataclassInstance,
+        suppress: bool = True,
+        unique_id: Optional[str] = None,
+        skip_schema_validation: bool = False,
+    ) -> Any:
         """
+
         Send Call message to client and return payload of response.
 
         The given payload is transformed into a Call object by looking at the
@@ -494,7 +578,9 @@ async def call(
         cls = getattr(self._call_result, payload.__class__.__name__)  # noqa
         return cls(**snake_case_payload)
 
-    async def _get_specific_response(self, unique_id, timeout):
+    async def _get_specific_response(
+        self, unique_id: Optional[str], timeout: Union[int, float]
+    ) -> Any:
         """
         Return response with given unique ID or raise an asyncio.TimeoutError.
         """
@@ -516,6 +602,6 @@ async def _get_specific_response(self, unique_id, timeout):
 
         return await self._get_specific_response(unique_id, timeout_left)
 
-    async def _send(self, message):
+    async def _send(self, message: Any) -> None:
         self.logger.debug("%s: send message %s", self.id, message)
         await self._connection.send(message)
diff --git a/ocpp/exceptions.py b/ocpp/exceptions.py
index c678442b9..3064ccde6 100644
--- a/ocpp/exceptions.py
+++ b/ocpp/exceptions.py
@@ -1,20 +1,27 @@
+from __future__ import annotations
+
+from typing import Any, Dict
+
+
 class OCPPError(Exception):
     """Base class for all OCPP errors. It shouldn't be raised, only it
     subclasses.
     """
 
-    default_description = ""
+    default_description: str = ""
+    code: str
 
-    def __init__(self, description=None, details=None):
-        self.description = description
-        if description is None:
-            self.description = self.default_description
-
-        self.details = details
-        if self.details is None:
-            self.details = {}
+    def __init__(
+        self,
+        description: str = "",
+        details: Dict[str, Any] | None = None,
+    ):
+        self.description: str = (
+            description if description is not None else self.default_description
+        )
+        self.details = details if details is not None else {}
 
-    def __eq__(self, other):
+    def __eq__(self, other: object) -> bool:
         if other.__class__ is self.__class__:
             return (self.description, self.details) == (
                 other.description,
@@ -23,14 +30,14 @@ def __eq__(self, other):
 
         return NotImplemented
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"<{self.__class__.__name__} - description={self.description}, "
             f" details={self.details}>"
         )
 
-    def __str__(self):
-        return f"{self.__class__.__name__}: {self.description}, " f" {self.details}"
+    def __str__(self) -> str:
+        return f"{self.__class__.__name__}: {self.description},  {self.details}"
 
 
 class NotImplementedError(OCPPError):
@@ -75,7 +82,7 @@ class FormatViolationError(OCPPError):
 
     code = "FormatViolation"
     default_description = (
-        "Payload for Action is syntactically incorrect or " "structure for Action"
+        "Payload for Action is syntactically incorrect or structure for Action"
     )
 
 
diff --git a/ocpp/messages.py b/ocpp/messages.py
index 743aa8904..4009f3e0c 100644
--- a/ocpp/messages.py
+++ b/ocpp/messages.py
@@ -8,11 +8,12 @@
 import json
 import os
 from dataclasses import asdict, is_dataclass
-from typing import Callable, Dict, Union
+from typing import TYPE_CHECKING, Any, Dict, Optional, Type, Union
 
 from jsonschema import Draft4Validator
 from jsonschema.exceptions import ValidationError as SchemaValidationError
 
+from ocpp._types import OCPPVersion
 from ocpp.exceptions import (
     FormatViolationError,
     NotImplementedError,
@@ -24,6 +25,9 @@
     ValidationError,
 )
 
+if TYPE_CHECKING:
+    from _typeshed import DataclassInstance
+
 _validators: Dict[str, Draft4Validator] = {}
 
 ASYNC_VALIDATION = True
@@ -54,7 +58,7 @@ class _DecimalEncoder(json.JSONEncoder):
 
     """
 
-    def default(self, obj):
+    def default(self, obj: Any) -> Any:
         if isinstance(obj, decimal.Decimal):
             return float("%.1f" % obj)
         try:
@@ -79,7 +83,7 @@ class MessageType:
     CallError = 4
 
 
-def unpack(msg):
+def unpack(msg: Union[str, bytes]) -> Union[Call, CallResult, CallError]:
     """
     Unpacks a message into either a Call, CallError or CallResult.
     """
@@ -117,7 +121,7 @@ def unpack(msg):
     )
 
 
-def pack(msg):
+def pack(msg: Union[Call, CallResult, CallError]) -> str:
     """
     Returns the JSON representation of a Call, CallError or CallResult.
 
@@ -128,7 +132,10 @@ def pack(msg):
 
 
 def get_validator(
-    message_type_id: int, action: str, ocpp_version: str, parse_float: Callable = float
+    message_type_id: int,
+    action: str,
+    ocpp_version: OCPPVersion,
+    parse_float: Union[Type[float], Type[decimal.Decimal]] = float,
 ) -> Draft4Validator:
     """
     Read schema from disk and return as `Draft4Validator`. Instances will be
@@ -173,7 +180,9 @@ def get_validator(
     return _validators[cache_key]
 
 
-async def validate_payload(message: Union[Call, CallResult], ocpp_version: str) -> None:
+async def validate_payload(
+    message: Union[Call, CallResult], ocpp_version: OCPPVersion
+) -> None:
     """Validate the payload of the message using JSON schemas."""
     if ASYNC_VALIDATION:
         await asyncio.get_event_loop().run_in_executor(
@@ -183,7 +192,9 @@ async def validate_payload(message: Union[Call, CallResult], ocpp_version: str)
         _validate_payload(message, ocpp_version)
 
 
-def _validate_payload(message: Union[Call, CallResult], ocpp_version: str) -> None:
+def _validate_payload(
+    message: Union[Call, CallResult], ocpp_version: OCPPVersion
+) -> None:
     if type(message) not in [Call, CallResult]:
         raise ValidationError(
             "Payload can't be validated because message "
@@ -217,6 +228,7 @@ def _validate_payload(message: Union[Call, CallResult], ocpp_version: str) -> No
                 and message.action == "GetCompositeSchedule"
             )
         ):
+            assert message.action is not None
             validator = get_validator(
                 message.message_type_id,
                 message.action,
@@ -228,8 +240,11 @@ def _validate_payload(message: Union[Call, CallResult], ocpp_version: str) -> No
                 json.dumps(message.payload), parse_float=decimal.Decimal
             )
         else:
+            assert message.action is not None
             validator = get_validator(
-                message.message_type_id, message.action, ocpp_version
+                message.message_type_id,
+                message.action,
+                ocpp_version,
             )
     except (OSError, json.JSONDecodeError):
         raise NotImplementedError(
@@ -293,7 +308,12 @@ class Call:
 
     message_type_id = 2
 
-    def __init__(self, unique_id, action, payload):
+    def __init__(
+        self,
+        unique_id: str,
+        action: str,
+        payload: Union[Dict[str, Any], DataclassInstance],
+    ) -> None:
         self.unique_id = unique_id
         self.action = action
         self.payload = payload
@@ -301,7 +321,7 @@ def __init__(self, unique_id, action, payload):
         if is_dataclass(payload):
             self.payload = asdict(payload)
 
-    def to_json(self):
+    def to_json(self) -> str:
         """Return a valid JSON representation of the instance."""
         return json.dumps(
             [
@@ -316,15 +336,15 @@ def to_json(self):
             cls=_DecimalEncoder,
         )
 
-    def create_call_result(self, payload):
+    def create_call_result(self, payload: Dict[str, Any]) -> CallResult:
         call_result = CallResult(self.unique_id, payload)
         call_result.action = self.action
         return call_result
 
-    def create_call_error(self, exception):
+    def create_call_error(self, exception: BaseException) -> CallError:
         error_code = "InternalError"
         error_description = "An unexpected error occurred."
-        error_details = {}
+        error_details: Optional[Dict[str, Any]] = {}
 
         if isinstance(exception, OCPPError):
             error_code = exception.code
@@ -338,7 +358,7 @@ def create_call_error(self, exception):
             error_details,
         )
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"<Call - unique_id={self.unique_id}, action={self.action}, "
             f"payload={self.payload}>"
@@ -375,7 +395,12 @@ class CallResult:
 
     message_type_id = 3
 
-    def __init__(self, unique_id, payload, action=None):
+    def __init__(
+        self,
+        unique_id: str,
+        payload: Union[Dict[str, Any], DataclassInstance],
+        action: Optional[str] = None,
+    ):
         self.unique_id = unique_id
         self.payload = payload
 
@@ -383,7 +408,7 @@ def __init__(self, unique_id, payload, action=None):
         # to validate the message it is needed.
         self.action = action
 
-    def to_json(self):
+    def to_json(self) -> str:
         return json.dumps(
             [
                 self.message_type_id,
@@ -396,7 +421,7 @@ def to_json(self):
             cls=_DecimalEncoder,
         )
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"<CallResult - unique_id={self.unique_id}, "
             f"action={self.action}, "
@@ -421,13 +446,19 @@ class CallError:
 
     message_type_id = 4
 
-    def __init__(self, unique_id, error_code, error_description, error_details=None):
+    def __init__(
+        self,
+        unique_id: str,
+        error_code: str,
+        error_description: str,
+        error_details: Optional[Dict[str, Any]] = None,
+    ):
         self.unique_id = unique_id
         self.error_code = error_code
         self.error_description = error_description
         self.error_details = error_details
 
-    def to_json(self):
+    def to_json(self) -> str:
         return json.dumps(
             [
                 self.message_type_id,
@@ -442,7 +473,7 @@ def to_json(self):
             cls=_DecimalEncoder,
         )
 
-    def to_exception(self):
+    def to_exception(self) -> OCPPError:
         """Return the exception that corresponds to the CallError."""
         for error in OCPPError.__subclasses__():
             if error.code == self.error_code:
@@ -451,11 +482,10 @@ def to_exception(self):
                 )
 
         raise UnknownCallErrorCodeError(
-            f"Error code '{self.error_code}' is not defined by the"
-            " OCPP specification"
+            f"Error code '{self.error_code}' is not defined by the OCPP specification"
         )
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"<CallError - unique_id={self.unique_id}, "
             f"error_code={self.error_code}, "
diff --git a/ocpp/py.typed b/ocpp/py.typed
new file mode 100644
index 000000000..e69de29bb
diff --git a/ocpp/routing.py b/ocpp/routing.py
index d9b4c311f..d8fae8ae0 100644
--- a/ocpp/routing.py
+++ b/ocpp/routing.py
@@ -1,9 +1,20 @@
+from __future__ import annotations
+
 import functools
+from typing import TYPE_CHECKING, Any, Callable, Dict, List, TypeVar
+
+from ocpp._types import Route
+
+if TYPE_CHECKING:
+    from ocpp.charge_point import ChargePoint
+
+
+routables: List[str] = []
 
-routables = []
+F = TypeVar("F", bound=Callable[..., Any])
 
 
-def on(action, *, skip_schema_validation=False):
+def on(action: str, *, skip_schema_validation: bool = False) -> Callable[[F], F]:
     """
     Function decorator to mark function as handler for specific action. The
     wrapped function may be async or sync.
@@ -42,13 +53,15 @@ async def on_boot_notification(
 
     """
 
-    def decorator(func):
+    def decorator(func: Any) -> Any:
         @functools.wraps(func)
-        def inner(*args, **kwargs):
+        def inner(*args: Any, **kwargs: Any) -> Any:
             return func(*args, **kwargs)
 
-        inner._on_action = action
-        inner._skip_schema_validation = skip_schema_validation
+        inner._on_action = action  # type: ignore[attr-defined]
+        inner._skip_schema_validation = (  # type: ignore[attr-defined]
+            skip_schema_validation
+        )
         if func.__name__ not in routables:
             routables.append(func.__name__)
         return inner
@@ -56,7 +69,7 @@ def inner(*args, **kwargs):
     return decorator
 
 
-def after(action, inject_response=False):
+def after(action: str, *, inject_response: bool = False) -> Any:
     """Function decorator to mark function as hook to post-request hook.
 
     This hook's arguments are the data that is in the payload for the specific
@@ -81,13 +94,13 @@ def after_boot_notification(self, call_response, **kwargs):
 
     """
 
-    def decorator(func):
+    def decorator(func: Any) -> Any:
         @functools.wraps(func)
-        def inner(*args, **kwargs):
+        def inner(*args: Any, **kwargs: Any) -> Any:
             return func(*args, **kwargs)
 
-        inner._after_action = action
-        inner._inject_response = inject_response
+        inner._after_action = action  # type: ignore[attr-defined]
+        inner._inject_response = inject_response  # type: ignore[attr-defined]
         if func.__name__ not in routables:
             routables.append(func.__name__)
         return inner
@@ -95,7 +108,7 @@ def inner(*args, **kwargs):
     return decorator
 
 
-def create_route_map(obj):
+def create_route_map(obj: ChargePoint) -> Dict[str, Route]:
     """
     Iterates of all attributes of the class looking for attributes which
     have been decorated by the @on() decorator It returns a dictionary where
@@ -125,12 +138,12 @@ def after_boot_notification(self, *args, **kwargs):
         }
 
     """
-    routes = {}
+    routes: Dict[str, Route] = {}
     for attr_name in routables:
         for option in ["_on_action", "_after_action"]:
             try:
-                attr = getattr(obj, attr_name)
-                action = getattr(attr, option)
+                attr: Callable[..., Any] = getattr(obj, attr_name)
+                action: str = getattr(attr, option)
 
                 if action not in routes:
                     routes[action] = {}
@@ -139,11 +152,11 @@ def after_boot_notification(self, *args, **kwargs):
                 # to skip validation of the input and output. For more info see
                 # the docstring of `on()`.
                 if option == "_on_action":
-                    routes[action]["_skip_schema_validation"] = getattr(
-                        attr, "_skip_schema_validation", False
+                    routes[action]["_skip_schema_validation"] = bool(
+                        getattr(attr, "_skip_schema_validation", False)
                     )
 
-                routes[action][option] = attr
+                routes[action][option] = attr  # type: ignore[literal-required]
 
             except AttributeError:
                 continue
diff --git a/ocpp/v16/call.py b/ocpp/v16/call.py
index 2cfae189c..b935346c7 100644
--- a/ocpp/v16/call.py
+++ b/ocpp/v16/call.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass, field
-from typing import Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 from ocpp.v16 import datatypes, enums
 
@@ -58,7 +58,7 @@ class ClearChargingProfile:
 
 @dataclass
 class DeleteCertificate:
-    certificate_hash_data: Dict
+    certificate_hash_data: Dict[str, Any]
 
 
 @dataclass
@@ -76,7 +76,7 @@ class GetCompositeSchedule:
 
 @dataclass
 class GetConfiguration:
-    key: Optional[List] = None
+    key: Optional[List[str]] = None
 
 
 @dataclass
@@ -100,7 +100,7 @@ class GetLocalListVersion:
 
 @dataclass
 class GetLog:
-    log: Dict
+    log: Dict[str, Any]
     log_type: enums.Log
     request_id: int
     retries: Optional[int] = None
@@ -117,7 +117,7 @@ class InstallCertificate:
 class RemoteStartTransaction:
     id_tag: str
     connector_id: Optional[int] = None
-    charging_profile: Optional[Union[Dict, datatypes.ChargingProfile]] = None
+    charging_profile: Optional[Union[Dict[str, Any], datatypes.ChargingProfile]] = None
 
 
 @dataclass
@@ -143,19 +143,19 @@ class Reset:
 class SendLocalList:
     list_version: int
     update_type: enums.UpdateType
-    local_authorization_list: List = field(default_factory=list)
+    local_authorization_list: List[Any] = field(default_factory=list)
 
 
 @dataclass
 class SetChargingProfile:
     connector_id: int
-    cs_charging_profiles: Union[datatypes.ChargingProfile, Dict]
+    cs_charging_profiles: Union[datatypes.ChargingProfile, Dict[str, Any]]
 
 
 @dataclass
 class SignedUpdateFirmware:
     request_id: int
-    firmware: Dict
+    firmware: Dict[str, Any]
     retries: Optional[int] = None
     retry_interval: Optional[int] = None
 
@@ -225,7 +225,7 @@ class LogStatusNotification:
 @dataclass
 class MeterValues:
     connector_id: int
-    meter_value: List = field(default_factory=list)
+    meter_value: List[Any] = field(default_factory=list)
     transaction_id: Optional[int] = None
 
 
@@ -263,7 +263,7 @@ class StopTransaction:
     transaction_id: int
     reason: Optional[enums.Reason] = None
     id_tag: Optional[str] = None
-    transaction_data: Optional[List] = None
+    transaction_data: Optional[List[Any]] = None
 
 
 @dataclass
diff --git a/ocpp/v16/call_result.py b/ocpp/v16/call_result.py
index 8b2910ab1..c19fc2229 100644
--- a/ocpp/v16/call_result.py
+++ b/ocpp/v16/call_result.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import Dict, List, Optional
+from typing import Any, Dict, List, Optional
 
 from ocpp.v16 import datatypes, enums
 
@@ -131,7 +131,7 @@ class ExtendedTriggerMessage:
 @dataclass
 class GetInstalledCertificateIds:
     status: enums.GetInstalledCertificateStatus
-    certificate_hash_data: Optional[List] = None
+    certificate_hash_data: Optional[List[Any]] = None
 
 
 @dataclass
@@ -139,13 +139,13 @@ class GetCompositeSchedule:
     status: enums.GetCompositeScheduleStatus
     connector_id: Optional[int] = None
     schedule_start: Optional[str] = None
-    charging_schedule: Optional[Dict] = None
+    charging_schedule: Optional[Dict[str, Any]] = None
 
 
 @dataclass
 class GetConfiguration:
-    configuration_key: Optional[List] = None
-    unknown_key: Optional[List] = None
+    configuration_key: Optional[List[str]] = None
+    unknown_key: Optional[List[str]] = None
 
 
 @dataclass
diff --git a/ocpp/v16/datatypes.py b/ocpp/v16/datatypes.py
index 944f7c457..4f7484bde 100644
--- a/ocpp/v16/datatypes.py
+++ b/ocpp/v16/datatypes.py
@@ -73,7 +73,7 @@ class KeyValue:
     readonly: bool
     value: Optional[str] = None
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
         if len(self.key) > enums.CiStringType.ci_string_50:
             msg = "Field key is longer than 50 characters"
             raise ValueError(msg)
diff --git a/ocpp/v16/enums.py b/ocpp/v16/enums.py
index 56aed63df..fdcf5c5f4 100644
--- a/ocpp/v16/enums.py
+++ b/ocpp/v16/enums.py
@@ -1,11 +1,13 @@
-try:
-    # breaking change introduced in python 3.11
+import sys
+
+if sys.version_info >= (3, 11, 0):
     from enum import StrEnum
-except ImportError:  # pragma: no cover
-    from enum import Enum  # pragma: no cover
 
-    class StrEnum(str, Enum):  # pragma: no cover
-        pass  # pragma: no cover
+else:
+    from enum import Enum
+
+    class StrEnum(str, Enum): # type: ignore [no-redef]
+        pass
 
 
 class Action(StrEnum):
diff --git a/ocpp/v201/datatypes.py b/ocpp/v201/datatypes.py
index a2e650289..c05343c0a 100644
--- a/ocpp/v201/datatypes.py
+++ b/ocpp/v201/datatypes.py
@@ -358,27 +358,6 @@ class CompositeScheduleType:
     charging_schedule_period: List[ChargingSchedulePeriodType]
 
 
-@dataclass
-class CostType:
-    """
-    CostType is used by: ConsumptionCostType
-    """
-
-    cost_kind: enums.CostKindEnumType
-    amount: int
-    amount_multiplier: Optional[int] = None
-
-
-@dataclass
-class ConsumptionCostType:
-    """
-    ConsumptionCostType is used by: SalesTariffEntryType
-    """
-
-    start_value: float
-    cost: List[CostType]
-
-
 @dataclass
 class EventDataType:
     """
@@ -735,19 +714,6 @@ class ReportDataType:
     variable_characteristics: Optional[VariableCharacteristicsType] = None
 
 
-@dataclass
-class SalesTariffType:
-    """
-    This dataType is based on dataTypes from ISO 15118-2.
-    SalesTariffType is used by: ChargingScheduleType
-    """
-
-    id: int
-    sales_tariff_entry: List[SalesTariffEntryType]
-    sales_tariff_description: Optional[str] = None
-    num_e_price_levels: Optional[int] = None
-
-
 @dataclass
 class SetMonitoringDataType:
     """
diff --git a/ocpp/v201/enums.py b/ocpp/v201/enums.py
index 2bcd2b162..47090141b 100644
--- a/ocpp/v201/enums.py
+++ b/ocpp/v201/enums.py
@@ -1,11 +1,13 @@
-try:
-    # breaking change introduced in python 3.11
+import sys
+
+if sys.version_info >= (3, 11, 0):
     from enum import StrEnum
-except ImportError:  # pragma: no cover
-    from enum import Enum  # pragma: no cover
 
-    class StrEnum(str, Enum):  # pragma: no cover
-        pass  # pragma: no cover
+else:
+    from enum import Enum
+
+    class StrEnum(str, Enum):  # type: ignore [no-redef]
+        pass
 
 
 class Action(StrEnum):
@@ -261,9 +263,7 @@ class ChargingProfilePurposeEnumType(StrEnum):
     MUST be set to TxProfile.
     """
 
-    charging_station_external_constraints = (
-        "ChargingStationExternalConstraints"  # noqa: E501
-    )
+    charging_station_external_constraints = "ChargingStationExternalConstraints"  # noqa: E501
     charging_station_max_profile = "ChargingStationMaxProfile"
     tx_default_profile = "TxDefaultProfile"
     tx_profile = "TxProfile"
@@ -1484,7 +1484,7 @@ class StandardizedVariableName(StrEnum):
     complete = "Complete"
     connected_time = "ConnectedTime"
     connector_type = "ConnectorType"
-    count = "Count"
+    count = "Count"  # type: ignore [assignment]
     currency = "Currency"
     current_imbalance = "CurrentImbalance"
     data_text = "DataText"
@@ -2648,7 +2648,7 @@ class SpacesCountSignageVariableName(StrEnum):
     """
 
     active = "Active"
-    count = "Count"
+    count = "Count"  # type: ignore [assignment]
     enabled = "Enabled"
 
 
diff --git a/ocpp/v21/enums.py b/ocpp/v21/enums.py
index 35af70bf8..8603ef4ec 100644
--- a/ocpp/v21/enums.py
+++ b/ocpp/v21/enums.py
@@ -1,11 +1,13 @@
-try:
-    # breaking change introduced in python 3.11
+import sys
+
+if sys.version_info >= (3, 11, 0):
     from enum import StrEnum
-except ImportError:  # pragma: no cover
-    from enum import Enum  # pragma: no cover
 
-    class StrEnum(str, Enum):  # pragma: no cover
-        pass  # pragma: no cover
+else:
+    from enum import Enum
+
+    class StrEnum(str, Enum):  # type: ignore [no-redef]
+        pass
 
 
 class Action(StrEnum):
diff --git a/poetry.lock b/poetry.lock
index 8f4a5f084..e90524e9d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -12,6 +12,73 @@ files = [
     {file = "alabaster-1.0.0.tar.gz", hash = "sha256:c00dca57bca26fa62a6d7d0a9fcce65f3e026e9bfe33e9c538fd3fbb2144fd9e"},
 ]
 
+[[package]]
+name = "ast-serialize"
+version = "0.8.0"
+description = "Python bindings for mypy AST serialization"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "ast_serialize-0.8.0-cp314-cp314-pyemscripten_2026_0_wasm32.whl", hash = "sha256:3d822605fa7bb326ef868d25fafced7fc660fa46d9b90c02ea86d5e2f5d325f7"},
+    {file = "ast_serialize-0.8.0-cp314-cp314t-macosx_10_12_x86_64.whl", hash = "sha256:2efa40b068197d5efb62655b43baadb842ed71c4958cccd3e8b86a35726f0119"},
+    {file = "ast_serialize-0.8.0-cp314-cp314t-macosx_11_0_arm64.whl", hash = "sha256:db1b957291bca08c7e72f43a12357b2948e20775d970e3fc3dac0aa3160ab725"},
+    {file = "ast_serialize-0.8.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:fdc0d5b18ff8fb364e87923e47c0a91d0d69dbcaeaa274591f7fd26892cc3a3a"},
+    {file = "ast_serialize-0.8.0-cp314-cp314t-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:9da7330f3e235bf7da89b8d39205c6350fc0c08a85379743f2df9fff87d6d980"},
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+    {file = "ast_serialize-0.8.0-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5075b9da3ef807eda752502446dfecea3b381c4900b7e27a5d5f4f899eb39951"},
+    {file = "ast_serialize-0.8.0-cp314-cp314t-manylinux_2_31_riscv64.whl", hash = "sha256:293cc1c5bfa741f8e3fbe8175b9c07beee487c9a6fdbb25a5acad9f1df2d30a9"},
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 version = "24.3.0"
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 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 groups = ["dev"]
-markers = "platform_system == \"Windows\" or sys_platform == \"win32\""
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+    {file = "mypy-2.3.1-cp315-cp315t-win_arm64.whl", hash = "sha256:8ad80807dc3ab8ea978b1b2b6e4a657194ace1d4ef03e0e731aff1abd517da29"},
+    {file = "mypy-2.3.1-py3-none-any.whl", hash = "sha256:6ed5c7e3419083268e5c9258bd1c1ef91af44a9e89374dbcaf37b775716e72eb"},
+    {file = "mypy-2.3.1.tar.gz", hash = "sha256:47c1b1207258513a9d93495f69c8be9de73916186f0e52703e8c461b7a623419"},
+]
+
+[package.dependencies]
+ast-serialize = ">=0.6.0,<1.0.0"
+librt = {version = ">=0.13.0", markers = "platform_python_implementation != \"PyPy\""}
+mypy_extensions = ">=1.0.0"
+pathspec = ">=1.0.0"
+typing_extensions = [
+    {version = ">=4.6.0", markers = "python_version < \"3.15\""},
+    {version = ">=4.14.0", markers = "python_version >= \"3.15\""},
+]
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+faster-cache = ["orjson"]
+install-types = ["pip"]
+mypyc = ["setuptools (>=50)"]
+reports = ["lxml"]
+
 [[package]]
 name = "mypy-extensions"
 version = "1.0.0"
@@ -814,7 +1108,7 @@ version = "0.35.1"
 description = "JSON Referencing + Python"
 optional = false
 python-versions = ">=3.8"
-groups = ["main"]
+groups = ["main", "dev"]
 files = [
     {file = "referencing-0.35.1-py3-none-any.whl", hash = "sha256:eda6d3234d62814d1c64e305c1331c9a3a6132da475ab6382eaa997b21ee75de"},
     {file = "referencing-0.35.1.tar.gz", hash = "sha256:25b42124a6c8b632a425174f24087783efb348a6f1e0008e63cd4466fedf703c"},
@@ -869,7 +1163,7 @@ version = "0.20.1"
 description = "Python bindings to Rust's persistent data structures (rpds)"
 optional = false
 python-versions = ">=3.8"
-groups = ["main"]
+groups = ["main", "dev"]
 files = [
     {file = "rpds_py-0.20.1-cp310-cp310-macosx_10_12_x86_64.whl", hash = "sha256:a649dfd735fff086e8a9d0503a9f0c7d01b7912a333c7ae77e1515c08c146dad"},
     {file = "rpds_py-0.20.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:f16bc1334853e91ddaaa1217045dd7be166170beec337576818461268a3de67f"},
@@ -1171,6 +1465,33 @@ lint = ["mypy", "ruff (==0.5.5)", "types-docutils"]
 standalone = ["Sphinx (>=5)"]
 test = ["pytest"]
 
+[[package]]
+name = "types-jsonschema"
+version = "4.26.0.20260518"
+description = "Typing stubs for jsonschema"
+optional = false
+python-versions = ">=3.10"
+groups = ["dev"]
+files = [
+    {file = "types_jsonschema-4.26.0.20260518-py3-none-any.whl", hash = "sha256:30b30a518c7fe335df85c919fcbcc631b69c03d4a4b5b632fa916bea03065307"},
+    {file = "types_jsonschema-4.26.0.20260518.tar.gz", hash = "sha256:e1dd53dc97a64f5eccdd6fa9839666e09bb500a8ebba2db6fdaf1789faea81a6"},
+]
+
+[package.dependencies]
+referencing = "*"
+
+[[package]]
+name = "typing-extensions"
+version = "4.16.0"
+description = "Backported and Experimental Type Hints for Python 3.9+"
+optional = false
+python-versions = ">=3.9"
+groups = ["dev"]
+files = [
+    {file = "typing_extensions-4.16.0-py3-none-any.whl", hash = "sha256:481caa481374e813c1b176ada14e97f1f67a4539ce9cfeb3f350d78d6370c2e8"},
+    {file = "typing_extensions-4.16.0.tar.gz", hash = "sha256:dc983d19a509c94dba722ee6abd33940f7c05a89e243c47e907eb4db6f1a43e5"},
+]
+
 [[package]]
 name = "urllib3"
 version = "2.7.0"
@@ -1192,4 +1513,4 @@ zstd = ["backports-zstd (>=1.0.0) ; python_version < \"3.14\""]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.11"
-content-hash = "dbaa02000afba8300bab9e08a603524dd841b8d29aa8b5023ffbf96344f55ffd"
+content-hash = "56e1a5c021fbedf35bdee92f0f275d9e91b66a9cf86b85f685bff96de9dd4fdd"
diff --git a/pyproject.toml b/pyproject.toml
index 8437befbd..e8e8f69c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,8 @@ flake8 = "^7.2.0"
 hypothesis = "^6.131.9"
 sphinx = "^8.2.3"
 sphinx-rtd-theme = "^3.0.2"
+mypy = "^2.3.1"
+types-jsonschema = "^4.26.0.20260518"
 
 [tool.black]
 line-length = 88
@@ -54,6 +56,14 @@ line-length = 88
 [tool.isort]
 profile = "black"
 
+[tool.mypy]
+strict = true
+
+[tool.coverage.report]
+exclude_also = [
+    "if sys.version_info <= \\(3, \\d+\\, \\d+\\):",
+]
+
 [build-system]
 requires = ["poetry-core>=2.0.0,<3.0.0"]
 build-backend = "poetry.core.masonry.api"