diff --git a/chargeamps/cli.py b/chargeamps/cli.py
index f74ccd7..7ec4ebc 100644
--- a/chargeamps/cli.py
+++ b/chargeamps/cli.py
@@ -33,7 +33,7 @@ async def command_list_chargepoints(
 ) -> None:
     res = []
     for cp in await client.get_chargepoints():
-        res.append(cp.to_dict())
+        res.append(cp.model_dump(by_alias=True))
     print(json.dumps(res, indent=4))
 
 
@@ -45,9 +45,9 @@ async def command_get_chargepoint_status(
     if args.connector_id:
         for c in cp.connector_statuses:
             if c.connector_id == args.connector_id:
-                print(json.dumps(c.to_dict(), indent=4))
+                print(json.dumps(c.model_dump(by_alias=True), indent=4))
     else:
-        print(json.dumps(cp.to_dict(), indent=4))
+        print(json.dumps(cp.model_dump(by_alias=True), indent=4))
 
 
 async def command_get_chargepoint_sessions(
@@ -68,7 +68,7 @@ async def command_get_chargepoint_sessions(
             charge_point_id, start_time, end_time
         ):
             if args.connector_id is None or args.connector_id == session.connector_id:
-                res.append(session.to_dict())
+                res.append(session.model_dump(by_alias=True))
         res = sorted(res, key=lambda i: i["id"])
         print(json.dumps(res, indent=4))
 
@@ -78,7 +78,7 @@ async def command_get_chargepoint_settings(
 ) -> None:
     charge_point_id = await get_chargepoint_id(client, args)
     settings = await client.get_chargepoint_settings(charge_point_id)
-    print(json.dumps(settings.to_dict(), indent=4))
+    print(json.dumps(settings.model_dump(by_alias=True), indent=4))
 
 
 async def command_set_chargepoint_settings(
@@ -92,7 +92,7 @@ async def command_set_chargepoint_settings(
         settings.down_light = args.downlight
     await client.set_chargepoint_settings(settings)
     settings = await client.get_chargepoint_settings(charge_point_id)
-    print(json.dumps(settings.to_dict(), indent=4))
+    print(json.dumps(settings.model_dump(by_alias=True), indent=4))
 
 
 async def command_get_connector_settings(
@@ -109,7 +109,7 @@ async def command_get_connector_settings(
         settings = await client.get_chargepoint_connector_settings(
             charge_point_id, connector_id
         )
-        res.append(settings.to_dict())
+        res.append(settings.model_dump(by_alias=True))
     print(json.dumps(res, indent=4))
 
 
@@ -133,7 +133,7 @@ async def command_set_connector_settings(
     settings = await client.get_chargepoint_connector_settings(
         charge_point_id, connector_id
     )
-    print(json.dumps(settings.to_dict(), indent=4))
+    print(json.dumps(settings.model_dump(by_alias=True), indent=4))
 
 
 def add_arg_chargepoint(parser, required=False) -> None:
diff --git a/chargeamps/external.py b/chargeamps/external.py
index 624aa52..359062b 100644
--- a/chargeamps/external.py
+++ b/chargeamps/external.py
@@ -20,7 +20,7 @@
 )
 
 API_BASE_URL = "https://eapi.charge.space"
-API_VERSION = "v4"
+API_VERSION = "v5"
 
 
 class ChargeAmpsExternalClient(ChargeAmpsClient):
@@ -84,7 +84,7 @@ async def get_chargepoints(self) -> list[ChargePoint]:
         response = await self._get(request_uri)
         res = []
         for chargepoint in await response.json():
-            res.append(ChargePoint.from_dict(chargepoint))
+            res.append(ChargePoint.model_validate(chargepoint))
         return res
 
     async def get_all_chargingsessions(
@@ -105,7 +105,7 @@ async def get_all_chargingsessions(
         response = await self._get(request_uri, params=query_params)
         res = []
         for session in await response.json():
-            res.append(ChargingSession.from_dict(session))
+            res.append(ChargingSession.model_validate(session))
         return res
 
     async def get_chargingsession(
@@ -114,13 +114,15 @@ async def get_chargingsession(
         """Get charging session"""
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/chargingsessions/{session}"
         response = await self._get(request_uri)
-        return ChargingSession.from_dict(await response.json())
+        payload = await response.json()
+        return ChargingSession.model_validate(payload)
 
     async def get_chargepoint_status(self, charge_point_id: str) -> ChargePointStatus:
         """Get charge point status"""
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/status"
         response = await self._get(request_uri)
-        return ChargePointStatus.from_dict(await response.json())
+        payload = await response.json()
+        return ChargePointStatus.model_validate(payload)
 
     async def get_chargepoint_settings(
         self, charge_point_id: str
@@ -128,11 +130,12 @@ async def get_chargepoint_settings(
         """Get chargepoint settings"""
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/settings"
         response = await self._get(request_uri)
-        return ChargePointSettings.from_dict(await response.json())
+        payload = await response.json()
+        return ChargePointSettings.model_validate(payload)
 
     async def set_chargepoint_settings(self, settings: ChargePointSettings) -> None:
         """Set chargepoint settings"""
-        payload = settings.to_dict()
+        payload = settings.model_dump(by_alias=True)
         charge_point_id = settings.id
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/settings"
         await self._put(request_uri, json=payload)
@@ -143,13 +146,14 @@ async def get_chargepoint_connector_settings(
         """Get all owned chargepoints"""
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/connectors/{connector_id}/settings"
         response = await self._get(request_uri)
-        return ChargePointConnectorSettings.from_dict(await response.json())
+        payload = await response.json()
+        return ChargePointConnectorSettings.model_validate(payload)
 
     async def set_chargepoint_connector_settings(
         self, settings: ChargePointConnectorSettings
     ) -> None:
         """Get all owned chargepoints"""
-        payload = settings.to_dict()
+        payload = settings.model_dump(by_alias=True)
         charge_point_id = settings.charge_point_id
         connector_id = settings.connector_id
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/connectors/{connector_id}/settings"
@@ -159,7 +163,7 @@ async def remote_start(
         self, charge_point_id: str, connector_id: int, start_auth: StartAuth
     ) -> None:
         """Remote start chargepoint"""
-        payload = start_auth.to_dict()
+        payload = start_auth.model_dump(by_alias=True)
         request_uri = f"/api/{API_VERSION}/chargepoints/{charge_point_id}/connectors/{connector_id}/remotestart"
         await self._put(request_uri, json=payload)
 
diff --git a/chargeamps/models.py b/chargeamps/models.py
index 7744912..1382cc7 100644
--- a/chargeamps/models.py
+++ b/chargeamps/models.py
@@ -1,25 +1,36 @@
-"""Base class and data classes for ChargeAmps API"""
+"""Data models for ChargeAmps API"""
 
-from dataclasses import dataclass
 from datetime import datetime
 from typing import Optional
 
-from dataclasses_json import LetterCase, dataclass_json
+from pydantic import BaseModel, ConfigDict, PlainSerializer
+from pydantic.alias_generators import to_camel
+from typing_extensions import Annotated
 
-from .utils import datetime_field
+CustomDateTime = Annotated[
+    datetime,
+    PlainSerializer(
+        lambda _datetime: _datetime.strftime("%Y-%m-%dT%H:%M:%SZ"), return_type=str
+    ),
+]
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargePointConnector:
+class FrozenBaseSchema(BaseModel):
+    model_config = ConfigDict(
+        alias_generator=to_camel,
+        populate_by_name=True,
+        from_attributes=True,
+        frozen=True,
+    )
+
+
+class ChargePointConnector(FrozenBaseSchema):
     charge_point_id: str
     connector_id: int
     type: str
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargePoint:
+class ChargePoint(FrozenBaseSchema):
     id: str
     name: str
     password: str
@@ -30,46 +41,36 @@ class ChargePoint:
     connectors: list[ChargePointConnector]
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargePointMeasurement:
+class ChargePointMeasurement(FrozenBaseSchema):
     phase: str
     current: float
     voltage: float
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargePointConnectorStatus:
+class ChargePointConnectorStatus(FrozenBaseSchema):
     charge_point_id: str
     connector_id: int
     total_consumption_kwh: float
     status: str
     measurements: Optional[list[ChargePointMeasurement]]
-    start_time: Optional[datetime] = datetime_field()
-    end_time: Optional[datetime] = datetime_field()
-    session_id: Optional[str] = None
+    start_time: Optional[CustomDateTime] = None
+    end_time: Optional[CustomDateTime] = None
+    session_id: Optional[int] = None
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargePointStatus:
+class ChargePointStatus(FrozenBaseSchema):
     id: str
     status: str
     connector_statuses: list[ChargePointConnectorStatus]
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=False)
-class ChargePointSettings:
+class ChargePointSettings(FrozenBaseSchema):
     id: str
     dimmer: str
     down_light: bool
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=False)
-class ChargePointConnectorSettings:
+class ChargePointConnectorSettings(FrozenBaseSchema):
     charge_point_id: str
     connector_id: int
     mode: str
@@ -78,21 +79,17 @@ class ChargePointConnectorSettings:
     max_current: Optional[float] = None
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class ChargingSession:
-    id: str
+class ChargingSession(FrozenBaseSchema):
+    id: int
     charge_point_id: str
     connector_id: int
     session_type: str
     total_consumption_kwh: float
-    start_time: Optional[datetime] = datetime_field()
-    end_time: Optional[datetime] = datetime_field()
+    start_time: Optional[CustomDateTime] = None
+    end_time: Optional[CustomDateTime] = None
 
 
-@dataclass_json(letter_case=LetterCase.CAMEL)
-@dataclass(frozen=True)
-class StartAuth:
+class StartAuth(FrozenBaseSchema):
     rfid_length: int
     rfid_format: str
     rfid: str
diff --git a/chargeamps/utils.py b/chargeamps/utils.py
deleted file mode 100644
index 6b92a63..0000000
--- a/chargeamps/utils.py
+++ /dev/null
@@ -1,28 +0,0 @@
-"""ChargeAmps API utils"""
-
-from dataclasses import field
-from datetime import datetime
-from typing import Optional
-
-from ciso8601 import parse_datetime
-from dataclasses_json import config
-from marshmallow import fields
-
-
-def datetime_encoder(x: Optional[datetime]) -> Optional[str]:
-    return datetime.isoformat(x) if x is not None else None
-
-
-def datetime_decoder(x: Optional[str]) -> Optional[datetime]:
-    return parse_datetime(x) if x is not None else None
-
-
-def datetime_field():
-    return field(
-        default=None,
-        metadata=config(
-            encoder=datetime_encoder,
-            decoder=datetime_decoder,
-            mm_field=fields.DateTime(format="iso"),
-        ),
-    )
diff --git a/poetry.lock b/poetry.lock
index e13ffcb..8733efa 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -110,6 +110,17 @@ files = [
 [package.dependencies]
 frozenlist = ">=1.1.0"
 
+[[package]]
+name = "annotated-types"
+version = "0.7.0"
+description = "Reusable constraint types to use with typing.Annotated"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53"},
+    {file = "annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89"},
+]
+
 [[package]]
 name = "arrow"
 version = "1.3.0"
@@ -233,25 +244,6 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
-[[package]]
-name = "dataclasses-json"
-version = "0.5.9"
-description = "Easily serialize dataclasses to and from JSON"
-optional = false
-python-versions = ">=3.6"
-files = [
-    {file = "dataclasses-json-0.5.9.tar.gz", hash = "sha256:e9ac87b73edc0141aafbce02b44e93553c3123ad574958f0fe52a534b6707e8e"},
-    {file = "dataclasses_json-0.5.9-py3-none-any.whl", hash = "sha256:1280542631df1c375b7bc92e5b86d39e06c44760d7e3571a537b3b8acabf2f0c"},
-]
-
-[package.dependencies]
-marshmallow = ">=3.3.0,<4.0.0"
-marshmallow-enum = ">=1.5.1,<2.0.0"
-typing-inspect = ">=0.4.0"
-
-[package.extras]
-dev = ["flake8", "hypothesis", "ipython", "mypy (>=0.710)", "portray", "pytest (>=7.2.0)", "setuptools", "simplejson", "twine", "types-dataclasses", "wheel"]
-
 [[package]]
 name = "exceptiongroup"
 version = "1.2.1"
@@ -388,39 +380,6 @@ files = [
 [package.dependencies]
 arrow = ">=0.15.0"
 
-[[package]]
-name = "marshmallow"
-version = "3.21.3"
-description = "A lightweight library for converting complex datatypes to and from native Python datatypes."
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "marshmallow-3.21.3-py3-none-any.whl", hash = "sha256:86ce7fb914aa865001a4b2092c4c2872d13bc347f3d42673272cabfdbad386f1"},
-    {file = "marshmallow-3.21.3.tar.gz", hash = "sha256:4f57c5e050a54d66361e826f94fba213eb10b67b2fdb02c3e0343ce207ba1662"},
-]
-
-[package.dependencies]
-packaging = ">=17.0"
-
-[package.extras]
-dev = ["marshmallow[tests]", "pre-commit (>=3.5,<4.0)", "tox"]
-docs = ["alabaster (==0.7.16)", "autodocsumm (==0.2.12)", "sphinx (==7.3.7)", "sphinx-issues (==4.1.0)", "sphinx-version-warning (==1.1.2)"]
-tests = ["pytest", "pytz", "simplejson"]
-
-[[package]]
-name = "marshmallow-enum"
-version = "1.5.1"
-description = "Enum field for Marshmallow"
-optional = false
-python-versions = "*"
-files = [
-    {file = "marshmallow-enum-1.5.1.tar.gz", hash = "sha256:38e697e11f45a8e64b4a1e664000897c659b60aa57bfa18d44e226a9920b6e58"},
-    {file = "marshmallow_enum-1.5.1-py2.py3-none-any.whl", hash = "sha256:57161ab3dbfde4f57adeb12090f39592e992b9c86d206d02f6bd03ebec60f072"},
-]
-
-[package.dependencies]
-marshmallow = ">=2.0.0"
-
 [[package]]
 name = "multidict"
 version = "6.0.5"
@@ -520,17 +479,6 @@ files = [
     {file = "multidict-6.0.5.tar.gz", hash = "sha256:f7e301075edaf50500f0b341543c41194d8df3ae5caf4702f2095f3ca73dd8da"},
 ]
 
-[[package]]
-name = "mypy-extensions"
-version = "1.0.0"
-description = "Type system extensions for programs checked with the mypy type checker."
-optional = false
-python-versions = ">=3.5"
-files = [
-    {file = "mypy_extensions-1.0.0-py3-none-any.whl", hash = "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d"},
-    {file = "mypy_extensions-1.0.0.tar.gz", hash = "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"},
-]
-
 [[package]]
 name = "packaging"
 version = "24.1"
@@ -557,6 +505,116 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
+[[package]]
+name = "pydantic"
+version = "2.7.4"
+description = "Data validation using Python type hints"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pydantic-2.7.4-py3-none-any.whl", hash = "sha256:ee8538d41ccb9c0a9ad3e0e5f07bf15ed8015b481ced539a1759d8cc89ae90d0"},
+    {file = "pydantic-2.7.4.tar.gz", hash = "sha256:0c84efd9548d545f63ac0060c1e4d39bb9b14db8b3c0652338aecc07b5adec52"},
+]
+
+[package.dependencies]
+annotated-types = ">=0.4.0"
+pydantic-core = "2.18.4"
+typing-extensions = ">=4.6.1"
+
+[package.extras]
+email = ["email-validator (>=2.0.0)"]
+
+[[package]]
+name = "pydantic-core"
+version = "2.18.4"
+description = "Core functionality for Pydantic validation and serialization"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pydantic_core-2.18.4-cp310-cp310-macosx_10_12_x86_64.whl", hash = "sha256:f76d0ad001edd426b92233d45c746fd08f467d56100fd8f30e9ace4b005266e4"},
+    {file = "pydantic_core-2.18.4-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:59ff3e89f4eaf14050c8022011862df275b552caef8082e37b542b066ce1ff26"},
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+    {file = "ruff-0.4.10-py3-none-win_arm64.whl", hash = "sha256:dd1fcee327c20addac7916ca4e2653fbbf2e8388d8a6477ce5b4e986b68ae6c0"},
+    {file = "ruff-0.4.10.tar.gz", hash = "sha256:3aa4f2bc388a30d346c56524f7cacca85945ba124945fe489952aadb6b5cd804"},
 ]
 
 [[package]]
@@ -711,21 +769,6 @@ files = [
     {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
 ]
 
-[[package]]
-name = "typing-inspect"
-version = "0.9.0"
-description = "Runtime inspection utilities for typing module."
-optional = false
-python-versions = "*"
-files = [
-    {file = "typing_inspect-0.9.0-py3-none-any.whl", hash = "sha256:9ee6fc59062311ef8547596ab6b955e1b8aa46242d854bfc78f4f6b0eff35f9f"},
-    {file = "typing_inspect-0.9.0.tar.gz", hash = "sha256:b23fc42ff6f6ef6954e4852c1fb512cdd18dbea03134f91f856a95ccc9461f78"},
-]
-
-[package.dependencies]
-mypy-extensions = ">=0.3.0"
-typing-extensions = ">=3.7.4"
-
 [[package]]
 name = "yarl"
 version = "1.9.4"
@@ -832,4 +875,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "cce22f8a521c05e5cd46cdae5e634ac177e3c1e415e10e8553164ece7fb299e4"
+content-hash = "7d1d7d27e4f94ec46b625cc1858cf3b7ca07a57ec6b83fc2b122f396898f381d"
diff --git a/pyproject.toml b/pyproject.toml
index f38d1ed..ad2b506 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,12 +28,11 @@ chargeamps = "chargeamps.cli:main"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-aiohttp = "^3.8.5"
-dataclasses-json = "^0.5.2"
-marshmallow = "^3.14.1"
+aiohttp = "^3.9.5"
 PyJWT = "^2.1.0"
 isoduration = "^20.11.0"
 ciso8601 = "^2.2.0"
+pydantic = "^2.7.4"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.4.3"