diff --git a/pyproject.toml b/pyproject.toml
index 3bfdb256..23c6619c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,16 +46,16 @@ Repository = "https://github.com/anthropics/anthropic-sdk-python"
 [tool.rye]
 managed = true
 dev-dependencies = [
-    # version pins are in requirements-dev.lock
-    "pyright",
-    "mypy",
-    "black",
-    "respx",
-    "pytest",
-    "pytest-asyncio",
-    "ruff",
-    "time-machine",
-    "nox",
+    "pyright==1.1.332",
+    "mypy==1.7.1",
+    "black==23.3.0",
+    "respx==0.20.2",
+    "pytest==7.1.1",
+    "pytest-asyncio==0.21.1",
+    "ruff==0.0.282",
+    "isort==5.10.1",
+    "time-machine==2.9.0",
+    "nox==2023.4.22",
     "dirty-equals>=0.6.0",
 
 ]
@@ -65,10 +65,12 @@ format = { chain = [
   "format:black",
   "format:docs",
   "format:ruff",
+  "format:isort",
 ]}
 "format:black" = "black ."
 "format:docs" = "python bin/blacken-docs.py README.md api.md"
 "format:ruff" = "ruff --fix ."
+"format:isort" = "isort ."
 
 "check:ruff" = "ruff ."
 
@@ -123,13 +125,16 @@ reportImplicitOverride = true
 reportImportCycles = false
 reportPrivateUsage = false
 
+[tool.isort]
+profile = "black"
+length_sort = true
+extra_standard_library = ["typing_extensions"]
+
 [tool.ruff]
 line-length = 120
-output-format = "grouped"
+format = "grouped"
 target-version = "py37"
 select = [
-  # isort
-  "I",
   # remove unused imports
   "F401",
   # bare except statements
@@ -147,12 +152,6 @@ unfixable = [
 ]
 ignore-init-module-imports = true
 
-[tool.ruff.lint.isort]
-length-sort = true
-length-sort-straight = true
-combine-as-imports = true
-extra-standard-library = ["typing_extensions"]
-known-first-party = ["anthropic", "tests"]
 
 [tool.ruff.per-file-ignores]
 "bin/**.py" = ["T201", "T203"]
diff --git a/requirements-dev.lock b/requirements-dev.lock
index e55c1c41..49d026c1 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -13,7 +13,6 @@ argcomplete==3.1.2
 attrs==23.1.0
 black==23.3.0
 certifi==2023.7.22
-charset-normalizer==3.3.2
 click==8.1.7
 colorlog==6.7.0
 dirty-equals==0.6.0
@@ -21,13 +20,12 @@ distlib==0.3.7
 distro==1.8.0
 exceptiongroup==1.1.3
 filelock==3.12.4
-fsspec==2023.12.1
 h11==0.14.0
 httpcore==1.0.2
 httpx==0.25.2
-huggingface-hub==0.16.4
 idna==3.4
 iniconfig==2.0.0
+isort==5.10.1
 mypy==1.7.1
 mypy-extensions==1.0.0
 nodeenv==1.8.0
@@ -44,18 +42,14 @@ pytest==7.1.1
 pytest-asyncio==0.21.1
 python-dateutil==2.8.2
 pytz==2023.3.post1
-pyyaml==6.0.1
-requests==2.31.0
 respx==0.20.2
-ruff==0.1.7
+ruff==0.0.282
 six==1.16.0
 sniffio==1.3.0
 time-machine==2.9.0
 tokenizers==0.14.0
 tomli==2.0.1
-tqdm==4.66.1
 typing-extensions==4.8.0
-urllib3==2.1.0
 virtualenv==20.24.5
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.2.2
diff --git a/src/anthropic/__init__.py b/src/anthropic/__init__.py
index 54e6bc84..01b0a81c 100644
--- a/src/anthropic/__init__.py
+++ b/src/anthropic/__init__.py
@@ -15,7 +15,8 @@
     RequestOptions,
 )
 from ._version import __title__, __version__
-from ._constants import AI_PROMPT as AI_PROMPT, HUMAN_PROMPT as HUMAN_PROMPT
+from ._constants import AI_PROMPT as AI_PROMPT
+from ._constants import HUMAN_PROMPT as HUMAN_PROMPT
 from ._exceptions import (
     APIError,
     ConflictError,
diff --git a/src/anthropic/_client.py b/src/anthropic/_client.py
index 72d3f2d1..33648605 100644
--- a/src/anthropic/_client.py
+++ b/src/anthropic/_client.py
@@ -23,12 +23,10 @@
     AsyncTransport,
     RequestOptions,
 )
-from ._utils import (
-    is_given,
-    get_async_library,
-)
+from ._utils import is_given, get_async_library
 from ._version import __version__
-from ._streaming import Stream as Stream, AsyncStream as AsyncStream
+from ._streaming import Stream as Stream
+from ._streaming import AsyncStream as AsyncStream
 from ._exceptions import APIStatusError
 from ._tokenizers import sync_get_tokenizer, async_get_tokenizer
 from ._base_client import (
diff --git a/src/anthropic/_compat.py b/src/anthropic/_compat.py
index d95db8ed..34323c9b 100644
--- a/src/anthropic/_compat.py
+++ b/src/anthropic/_compat.py
@@ -43,23 +43,21 @@ def is_typeddict(type_: type[Any]) -> bool:  # noqa: ARG001
 
 else:
     if PYDANTIC_V2:
-        from pydantic.v1.typing import (
-            get_args as get_args,
-            is_union as is_union,
-            get_origin as get_origin,
-            is_typeddict as is_typeddict,
-            is_literal_type as is_literal_type,
-        )
-        from pydantic.v1.datetime_parse import parse_date as parse_date, parse_datetime as parse_datetime
+        from pydantic.v1.typing import get_args as get_args
+        from pydantic.v1.typing import is_union as is_union
+        from pydantic.v1.typing import get_origin as get_origin
+        from pydantic.v1.typing import is_typeddict as is_typeddict
+        from pydantic.v1.typing import is_literal_type as is_literal_type
+        from pydantic.v1.datetime_parse import parse_date as parse_date
+        from pydantic.v1.datetime_parse import parse_datetime as parse_datetime
     else:
-        from pydantic.typing import (
-            get_args as get_args,
-            is_union as is_union,
-            get_origin as get_origin,
-            is_typeddict as is_typeddict,
-            is_literal_type as is_literal_type,
-        )
-        from pydantic.datetime_parse import parse_date as parse_date, parse_datetime as parse_datetime
+        from pydantic.typing import get_args as get_args
+        from pydantic.typing import is_union as is_union
+        from pydantic.typing import get_origin as get_origin
+        from pydantic.typing import is_typeddict as is_typeddict
+        from pydantic.typing import is_literal_type as is_literal_type
+        from pydantic.datetime_parse import parse_date as parse_date
+        from pydantic.datetime_parse import parse_datetime as parse_datetime
 
 
 # refactored config
diff --git a/src/anthropic/_models.py b/src/anthropic/_models.py
index cdd44ccb..5b8c9601 100644
--- a/src/anthropic/_models.py
+++ b/src/anthropic/_models.py
@@ -30,11 +30,17 @@
     AnyMapping,
     HttpxRequestFiles,
 )
-from ._utils import is_list, is_given, is_mapping, parse_date, parse_datetime, strip_not_given
+from ._utils import (
+    is_list,
+    is_given,
+    is_mapping,
+    parse_date,
+    parse_datetime,
+    strip_not_given,
+)
+from ._compat import PYDANTIC_V2, ConfigDict
+from ._compat import GenericModel as BaseGenericModel
 from ._compat import (
-    PYDANTIC_V2,
-    ConfigDict,
-    GenericModel as BaseGenericModel,
     get_args,
     is_union,
     parse_obj,
diff --git a/src/anthropic/_types.py b/src/anthropic/_types.py
index 4b7d5e7f..7e95adbe 100644
--- a/src/anthropic/_types.py
+++ b/src/anthropic/_types.py
@@ -19,7 +19,14 @@
     Sequence,
     AsyncIterator,
 )
-from typing_extensions import Literal, Protocol, TypeAlias, TypedDict, override, runtime_checkable
+from typing_extensions import (
+    Literal,
+    Protocol,
+    TypeAlias,
+    TypedDict,
+    override,
+    runtime_checkable,
+)
 
 import pydantic
 from httpx import URL, Proxy, Timeout, Response, BaseTransport, AsyncBaseTransport
diff --git a/src/anthropic/_utils/__init__.py b/src/anthropic/_utils/__init__.py
index e98636c9..400ca9b8 100644
--- a/src/anthropic/_utils/__init__.py
+++ b/src/anthropic/_utils/__init__.py
@@ -1,41 +1,37 @@
 from ._proxy import LazyProxy as LazyProxy
-from ._utils import (
-    flatten as flatten,
-    is_dict as is_dict,
-    is_list as is_list,
-    is_given as is_given,
-    is_tuple as is_tuple,
-    is_mapping as is_mapping,
-    is_tuple_t as is_tuple_t,
-    parse_date as parse_date,
-    is_sequence as is_sequence,
-    coerce_float as coerce_float,
-    is_list_type as is_list_type,
-    is_mapping_t as is_mapping_t,
-    removeprefix as removeprefix,
-    removesuffix as removesuffix,
-    extract_files as extract_files,
-    is_sequence_t as is_sequence_t,
-    is_union_type as is_union_type,
-    required_args as required_args,
-    coerce_boolean as coerce_boolean,
-    coerce_integer as coerce_integer,
-    file_from_path as file_from_path,
-    parse_datetime as parse_datetime,
-    strip_not_given as strip_not_given,
-    deepcopy_minimal as deepcopy_minimal,
-    extract_type_arg as extract_type_arg,
-    is_required_type as is_required_type,
-    get_async_library as get_async_library,
-    is_annotated_type as is_annotated_type,
-    maybe_coerce_float as maybe_coerce_float,
-    get_required_header as get_required_header,
-    maybe_coerce_boolean as maybe_coerce_boolean,
-    maybe_coerce_integer as maybe_coerce_integer,
-    strip_annotated_type as strip_annotated_type,
-)
-from ._transform import (
-    PropertyInfo as PropertyInfo,
-    transform as transform,
-    maybe_transform as maybe_transform,
-)
+from ._utils import flatten as flatten
+from ._utils import is_dict as is_dict
+from ._utils import is_list as is_list
+from ._utils import is_given as is_given
+from ._utils import is_tuple as is_tuple
+from ._utils import is_mapping as is_mapping
+from ._utils import is_tuple_t as is_tuple_t
+from ._utils import parse_date as parse_date
+from ._utils import is_sequence as is_sequence
+from ._utils import coerce_float as coerce_float
+from ._utils import is_list_type as is_list_type
+from ._utils import is_mapping_t as is_mapping_t
+from ._utils import removeprefix as removeprefix
+from ._utils import removesuffix as removesuffix
+from ._utils import extract_files as extract_files
+from ._utils import is_sequence_t as is_sequence_t
+from ._utils import is_union_type as is_union_type
+from ._utils import required_args as required_args
+from ._utils import coerce_boolean as coerce_boolean
+from ._utils import coerce_integer as coerce_integer
+from ._utils import file_from_path as file_from_path
+from ._utils import parse_datetime as parse_datetime
+from ._utils import strip_not_given as strip_not_given
+from ._utils import deepcopy_minimal as deepcopy_minimal
+from ._utils import extract_type_arg as extract_type_arg
+from ._utils import is_required_type as is_required_type
+from ._utils import get_async_library as get_async_library
+from ._utils import is_annotated_type as is_annotated_type
+from ._utils import maybe_coerce_float as maybe_coerce_float
+from ._utils import get_required_header as get_required_header
+from ._utils import maybe_coerce_boolean as maybe_coerce_boolean
+from ._utils import maybe_coerce_integer as maybe_coerce_integer
+from ._utils import strip_annotated_type as strip_annotated_type
+from ._transform import PropertyInfo as PropertyInfo
+from ._transform import transform as transform
+from ._transform import maybe_transform as maybe_transform
diff --git a/src/anthropic/_utils/_utils.py b/src/anthropic/_utils/_utils.py
index cce69238..83f88cc3 100644
--- a/src/anthropic/_utils/_utils.py
+++ b/src/anthropic/_utils/_utils.py
@@ -21,7 +21,9 @@
 import sniffio
 
 from .._types import Headers, NotGiven, FileTypes, NotGivenOr, HeadersLike
-from .._compat import is_union as _is_union, parse_date as parse_date, parse_datetime as parse_datetime
+from .._compat import is_union as _is_union
+from .._compat import parse_date as parse_date
+from .._compat import parse_datetime as parse_datetime
 
 _T = TypeVar("_T")
 _TupleT = TypeVar("_TupleT", bound=Tuple[object, ...])
diff --git a/src/anthropic/resources/__init__.py b/src/anthropic/resources/__init__.py
index a03af036..bbb8787d 100644
--- a/src/anthropic/resources/__init__.py
+++ b/src/anthropic/resources/__init__.py
@@ -1,5 +1,10 @@
 # File generated from our OpenAPI spec by Stainless.
 
-from .completions import Completions, AsyncCompletions, CompletionsWithRawResponse, AsyncCompletionsWithRawResponse
+from .completions import (
+    Completions,
+    AsyncCompletions,
+    CompletionsWithRawResponse,
+    AsyncCompletionsWithRawResponse,
+)
 
 __all__ = ["Completions", "AsyncCompletions", "CompletionsWithRawResponse", "AsyncCompletionsWithRawResponse"]
diff --git a/src/anthropic/resources/completions.py b/src/anthropic/resources/completions.py
index 103d0b7f..a603634d 100644
--- a/src/anthropic/resources/completions.py
+++ b/src/anthropic/resources/completions.py
@@ -8,20 +8,12 @@
 import httpx
 
 from ..types import Completion, completion_create_params
-from .._types import (
-    NOT_GIVEN,
-    Body,
-    Query,
-    Headers,
-    NotGiven,
-)
+from .._types import NOT_GIVEN, Body, Query, Headers, NotGiven
 from .._utils import required_args, maybe_transform
 from .._resource import SyncAPIResource, AsyncAPIResource
 from .._response import to_raw_response_wrapper, async_to_raw_response_wrapper
 from .._streaming import Stream, AsyncStream
-from .._base_client import (
-    make_request_options,
-)
+from .._base_client import make_request_options
 
 if TYPE_CHECKING:
     from .._client import Anthropic, AsyncAnthropic
diff --git a/tests/utils.py b/tests/utils.py
index 994c1fc9..348363a5 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -8,12 +8,7 @@
 from typing_extensions import Literal, get_args, get_origin, assert_type
 
 from anthropic._types import NoneType
-from anthropic._utils import (
-    is_dict,
-    is_list,
-    is_list_type,
-    is_union_type,
-)
+from anthropic._utils import is_dict, is_list, is_list_type, is_union_type
 from anthropic._compat import PYDANTIC_V2, field_outer_type, get_model_fields
 from anthropic._models import BaseModel