diff --git a/pyproject.toml b/pyproject.toml
index 389d50e..e9a8dae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,3 +43,7 @@ serve = ["aiohttp", "PyYAML"]
 
 [tool.poetry.scripts]
 pywidevine = "pywidevine.main:main"
+
+[tool.isort]
+line_length = 118
+extend_skip_glob = ["*_pb2.py", "*_pb2.pyi"]
diff --git a/pywidevine/__init__.py b/pywidevine/__init__.py
index 760fa4d..6ea25ac 100644
--- a/pywidevine/__init__.py
+++ b/pywidevine/__init__.py
@@ -5,5 +5,4 @@ from .pssh import *
 from .remotecdm import *
 from .session import *
 
-
 __version__ = "1.5.3"
diff --git a/pywidevine/cdm.py b/pywidevine/cdm.py
index 70daa32..37dc99e 100644
--- a/pywidevine/cdm.py
+++ b/pywidevine/cdm.py
@@ -7,11 +7,11 @@ import subprocess
 import sys
 import time
 from pathlib import Path
-from typing import Union, Optional
+from typing import Optional, Union
 from uuid import UUID
 
 from Crypto.Cipher import AES, PKCS1_OAEP
-from Crypto.Hash import SHA1, HMAC, SHA256, CMAC
+from Crypto.Hash import CMAC, HMAC, SHA1, SHA256
 from Crypto.PublicKey import RSA
 from Crypto.Random import get_random_bytes
 from Crypto.Signature import pss
@@ -19,11 +19,12 @@ from Crypto.Util import Padding
 from google.protobuf.message import DecodeError
 
 from pywidevine.device import Device
-from pywidevine.exceptions import TooManySessions, InvalidSession, InvalidLicenseType, SignatureMismatch, \
-    InvalidInitData, InvalidLicenseMessage, NoKeysLoaded, InvalidContext
+from pywidevine.exceptions import (InvalidContext, InvalidInitData, InvalidLicenseMessage, InvalidLicenseType,
+                                   InvalidSession, NoKeysLoaded, SignatureMismatch, TooManySessions)
 from pywidevine.key import Key
-from pywidevine.license_protocol_pb2 import DrmCertificate, SignedMessage, SignedDrmCertificate, LicenseType, \
-    LicenseRequest, ProtocolVersion, ClientIdentification, EncryptedClientIdentification, License
+from pywidevine.license_protocol_pb2 import (ClientIdentification, DrmCertificate, EncryptedClientIdentification,
+                                             License, LicenseRequest, LicenseType, ProtocolVersion,
+                                             SignedDrmCertificate, SignedMessage)
 from pywidevine.pssh import PSSH
 from pywidevine.session import Session
 from pywidevine.utils import get_binary_path
diff --git a/pywidevine/device.py b/pywidevine/device.py
index e238514..09ce83f 100644
--- a/pywidevine/device.py
+++ b/pywidevine/device.py
@@ -14,7 +14,7 @@ from construct import Padded, Padding, Struct, this
 from Crypto.PublicKey import RSA
 from google.protobuf.message import DecodeError
 
-from pywidevine.license_protocol_pb2 import ClientIdentification, FileHashes, SignedDrmCertificate, DrmCertificate
+from pywidevine.license_protocol_pb2 import ClientIdentification, DrmCertificate, FileHashes, SignedDrmCertificate
 
 
 class _Types(Enum):
diff --git a/pywidevine/main.py b/pywidevine/main.py
index a0c4117..f6a52c4 100644
--- a/pywidevine/main.py
+++ b/pywidevine/main.py
@@ -6,15 +6,15 @@ from zlib import crc32
 
 import click
 import requests
-from construct import ConstructError
-from unidecode import unidecode, UnidecodeError
 import yaml
+from construct import ConstructError
 from google.protobuf.json_format import MessageToDict
+from unidecode import UnidecodeError, unidecode
 
 from pywidevine import __version__
 from pywidevine.cdm import Cdm
 from pywidevine.device import Device
-from pywidevine.license_protocol_pb2 import LicenseType, FileHashes
+from pywidevine.license_protocol_pb2 import FileHashes, LicenseType
 from pywidevine.pssh import PSSH
 
 
@@ -397,8 +397,8 @@ def serve_(config: Path, host: str, port: int):
     Host as 127.0.0.1 may block remote access even if port-forwarded.
     Instead, use 0.0.0.0 and ensure the TCP port you choose is forwarded.
     """
-    from pywidevine import serve
-    import yaml
+    from pywidevine import serve  # isort:skip
+    import yaml  # isort:skip
 
     config = yaml.safe_load(config.read_text(encoding="utf8"))
     serve.run(config, host, port)
diff --git a/pywidevine/pssh.py b/pywidevine/pssh.py
index 77708e8..7f8a977 100644
--- a/pywidevine/pssh.py
+++ b/pywidevine/pssh.py
@@ -4,7 +4,7 @@ import base64
 import binascii
 import string
 from io import BytesIO
-from typing import Union, Optional
+from typing import Optional, Union
 from uuid import UUID
 
 import construct
diff --git a/pywidevine/remotecdm.py b/pywidevine/remotecdm.py
index 96cf56b..6c9254a 100644
--- a/pywidevine/remotecdm.py
+++ b/pywidevine/remotecdm.py
@@ -3,21 +3,21 @@ from __future__ import annotations
 import base64
 import binascii
 import re
-from typing import Union, Optional
+from typing import Optional, Union
 
 import requests
 from Crypto.Hash import SHA1
 from Crypto.PublicKey import RSA
 from Crypto.Signature import pss
 from google.protobuf.message import DecodeError
+
 from pywidevine.cdm import Cdm
 from pywidevine.device import Device
-from pywidevine.exceptions import InvalidInitData, InvalidLicenseType, InvalidLicenseMessage, DeviceMismatch, \
-    SignatureMismatch
+from pywidevine.exceptions import (DeviceMismatch, InvalidInitData, InvalidLicenseMessage, InvalidLicenseType,
+                                   SignatureMismatch)
 from pywidevine.key import Key
-
-from pywidevine.license_protocol_pb2 import LicenseType, SignedMessage, License, ClientIdentification, \
-    SignedDrmCertificate
+from pywidevine.license_protocol_pb2 import (ClientIdentification, License, LicenseType, SignedDrmCertificate,
+                                             SignedMessage)
 from pywidevine.pssh import PSSH
 
 
diff --git a/pywidevine/serve.py b/pywidevine/serve.py
index 91e2a44..b09f9e7 100644
--- a/pywidevine/serve.py
+++ b/pywidevine/serve.py
@@ -20,8 +20,8 @@ except ImportError:
 from pywidevine import __version__
 from pywidevine.cdm import Cdm
 from pywidevine.device import Device
-from pywidevine.exceptions import TooManySessions, InvalidSession, SignatureMismatch, InvalidInitData, \
-    InvalidLicenseType, InvalidLicenseMessage, InvalidContext
+from pywidevine.exceptions import (InvalidContext, InvalidInitData, InvalidLicenseMessage, InvalidLicenseType,
+                                   InvalidSession, SignatureMismatch, TooManySessions)
 
 routes = web.RouteTableDef()