diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index be855ef..9b81a41 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -17,6 +17,8 @@ jobs:
         run: python -m pip install poetry
       - name: Install dependencies
         run: python -m poetry install --only dev
+      - name: Run black
+        run: python -m poetry run black --check bento_service_registry tests
       - name: Run linter
         run: python -m poetry run flake8 ./bento_service_registry ./tests
       - name: Run type checker
diff --git a/bento_service_registry/app.py b/bento_service_registry/app.py
index b2e9228..00aa651 100644
--- a/bento_service_registry/app.py
+++ b/bento_service_registry/app.py
@@ -37,7 +37,8 @@ def create_app(config_override: Callable[[], Config] | None = None) -> FastAPI:
     authz_middleware.attach(app)
 
     app.exception_handler(StarletteHTTPException)(
-        http_exception_handler_factory(get_logger(config_for_setup), authz_middleware))
+        http_exception_handler_factory(get_logger(config_for_setup), authz_middleware)
+    )
     app.exception_handler(RequestValidationError)(validation_exception_handler_factory(authz_middleware))
 
     return app
diff --git a/bento_service_registry/bento_services_json.py b/bento_service_registry/bento_services_json.py
index b210391..e760391 100644
--- a/bento_service_registry/bento_services_json.py
+++ b/bento_service_registry/bento_services_json.py
@@ -54,7 +54,7 @@ async def get_bento_services_by_compose_id(config: ConfigDependency) -> BentoSer
 
 
 async def get_bento_services_by_kind(
-    bento_services_by_compose_id: BentoServicesByComposeIDDependency
+    bento_services_by_compose_id: BentoServicesByComposeIDDependency,
 ) -> BentoServicesByKind:
     services_by_kind: BentoServicesByKind = {}
 
diff --git a/bento_service_registry/data_types.py b/bento_service_registry/data_types.py
index bc5d4a8..a6f25d5 100644
--- a/bento_service_registry/data_types.py
+++ b/bento_service_registry/data_types.py
@@ -41,7 +41,8 @@ async def get_data_types_from_service(
     async with http_session.get(urljoin(service_url_norm, "data-types"), headers=authz_header) as res:
         if res.status != status.HTTP_200_OK:
             logger.error(
-                f"Got non-200 response from data type service ({service_url=}): {res.status=}; body={await res.json()}")
+                f"Got non-200 response from data type service ({service_url=}): {res.status=}; body={await res.json()}"
+            )
             return ()
 
         dts: list[DataTypeWithServiceURL] = []
diff --git a/bento_service_registry/routes.py b/bento_service_registry/routes.py
index e3a8c23..3b2549a 100644
--- a/bento_service_registry/routes.py
+++ b/bento_service_registry/routes.py
@@ -65,7 +65,8 @@ async def get_service_by_id(
     if service_data is None:
         raise HTTPException(
             status.HTTP_500_INTERNAL_SERVER_ERROR,
-            f"An internal error was encountered with service with ID {service_id}")
+            f"An internal error was encountered with service with ID {service_id}",
+        )
 
     return service_data
 
diff --git a/bento_service_registry/services.py b/bento_service_registry/services.py
index 83c1292..298e0f8 100644
--- a/bento_service_registry/services.py
+++ b/bento_service_registry/services.py
@@ -91,7 +91,8 @@ async def get_service(
                     # TypeError can happen if None is received
                     self._logger.error(
                         f"{service_info_url}: Encountered invalid response ({str(e)}) - {await r.text()} "
-                        f"(Took {(datetime.now() - dt).total_seconds():.1f}s)")
+                        f"(Took {(datetime.now() - dt).total_seconds():.1f}s)"
+                    )
 
         except asyncio.TimeoutError:
             self._logger.error(f"Encountered timeout with {service_info_url}")
@@ -109,10 +110,12 @@ async def get_services(
         service_info: GA4GHServiceInfo,
     ) -> tuple[dict, ...]:
         if not self._co:
-            self._co = asyncio.gather(*(
-                self.get_service(authz_header, http_session, service_info, s)
-                for s in bento_services_by_kind.values()
-            ))
+            self._co = asyncio.gather(
+                *(
+                    self.get_service(authz_header, http_session, service_info, s)
+                    for s in bento_services_by_kind.values()
+                )
+            )
 
         service_list: list[dict | None] = await self._co
         self._co = None
diff --git a/bento_service_registry/types.py b/bento_service_registry/types.py
index 98faef3..dfac84e 100644
--- a/bento_service_registry/types.py
+++ b/bento_service_registry/types.py
@@ -3,6 +3,7 @@
 
 # TODO: py3.11(?): optional TypedDict props
 
+
 # required props for chord_services.json entries
 class BaseBentoService(TypedDict):
     url_template: str
diff --git a/bento_service_registry/workflows.py b/bento_service_registry/workflows.py
index 8e5b4ea..6162095 100644
--- a/bento_service_registry/workflows.py
+++ b/bento_service_registry/workflows.py
@@ -45,7 +45,8 @@ async def get_workflows_from_service(
         if res.status != status.HTTP_200_OK:
             logger.error(
                 f"Got non-200 response from data type service ({service_url=}): {res.status=}; body={data}; "
-                f"took {time_taken:.1f}s")
+                f"took {time_taken:.1f}s"
+            )
             return {}
 
         logger.debug(f"{workflows_url}: took {time_taken:.1f}s")
@@ -70,7 +71,8 @@ async def get_workflows(
     logger.debug("Collecting workflows from workflow-providing services")
 
     workflow_services = [
-        s for s in services_tuple
+        s
+        for s in services_tuple
         if (b := s.get("bento", {})).get("dataService", False) or b.get("workflowProvider", False)
     ]
 
diff --git a/poetry.lock b/poetry.lock
index c338c3a..0d4d732 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -241,6 +241,52 @@ django = ["django (>=4.2.7,<5.1)", "djangorestframework (>=3.14.0,<3.16)"]
 fastapi = ["fastapi (>=0.104,<0.112)"]
 flask = ["flask (>=2.2.5,<4)"]
 
+[[package]]
+name = "black"
+version = "24.4.2"
+description = "The uncompromising code formatter."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "black-24.4.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:dd1b5a14e417189db4c7b64a6540f31730713d173f0b63e55fabd52d61d8fdce"},
+    {file = "black-24.4.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:8e537d281831ad0e71007dcdcbe50a71470b978c453fa41ce77186bbe0ed6021"},
+    {file = "black-24.4.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:eaea3008c281f1038edb473c1aa8ed8143a5535ff18f978a318f10302b254063"},
+    {file = "black-24.4.2-cp310-cp310-win_amd64.whl", hash = "sha256:7768a0dbf16a39aa5e9a3ded568bb545c8c2727396d063bbaf847df05b08cd96"},
+    {file = "black-24.4.2-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:257d724c2c9b1660f353b36c802ccece186a30accc7742c176d29c146df6e474"},
+    {file = "black-24.4.2-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:bdde6f877a18f24844e381d45e9947a49e97933573ac9d4345399be37621e26c"},
+    {file = "black-24.4.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e151054aa00bad1f4e1f04919542885f89f5f7d086b8a59e5000e6c616896ffb"},
+    {file = "black-24.4.2-cp311-cp311-win_amd64.whl", hash = "sha256:7e122b1c4fb252fd85df3ca93578732b4749d9be076593076ef4d07a0233c3e1"},
+    {file = "black-24.4.2-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:accf49e151c8ed2c0cdc528691838afd217c50412534e876a19270fea1e28e2d"},
+    {file = "black-24.4.2-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:88c57dc656038f1ab9f92b3eb5335ee9b021412feaa46330d5eba4e51fe49b04"},
+    {file = "black-24.4.2-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:be8bef99eb46d5021bf053114442914baeb3649a89dc5f3a555c88737e5e98fc"},
+    {file = "black-24.4.2-cp312-cp312-win_amd64.whl", hash = "sha256:415e686e87dbbe6f4cd5ef0fbf764af7b89f9057b97c908742b6008cc554b9c0"},
+    {file = "black-24.4.2-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:bf10f7310db693bb62692609b397e8d67257c55f949abde4c67f9cc574492cc7"},
+    {file = "black-24.4.2-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:98e123f1d5cfd42f886624d84464f7756f60ff6eab89ae845210631714f6db94"},
+    {file = "black-24.4.2-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:48a85f2cb5e6799a9ef05347b476cce6c182d6c71ee36925a6c194d074336ef8"},
+    {file = "black-24.4.2-cp38-cp38-win_amd64.whl", hash = "sha256:b1530ae42e9d6d5b670a34db49a94115a64596bc77710b1d05e9801e62ca0a7c"},
+    {file = "black-24.4.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:37aae07b029fa0174d39daf02748b379399b909652a806e5708199bd93899da1"},
+    {file = "black-24.4.2-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:da33a1a5e49c4122ccdfd56cd021ff1ebc4a1ec4e2d01594fef9b6f267a9e741"},
+    {file = "black-24.4.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ef703f83fc32e131e9bcc0a5094cfe85599e7109f896fe8bc96cc402f3eb4b6e"},
+    {file = "black-24.4.2-cp39-cp39-win_amd64.whl", hash = "sha256:b9176b9832e84308818a99a561e90aa479e73c523b3f77afd07913380ae2eab7"},
+    {file = "black-24.4.2-py3-none-any.whl", hash = "sha256:d36ed1124bb81b32f8614555b34cc4259c3fbc7eec17870e8ff8ded335b58d8c"},
+    {file = "black-24.4.2.tar.gz", hash = "sha256:c872b53057f000085da66a19c55d68f6f8ddcac2642392ad3a355878406fbd4d"},
+]
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+packaging = ">=22.0"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing-extensions = {version = ">=4.0.1", markers = "python_version < \"3.11\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.7.4)", "aiohttp (>=3.7.4,!=3.9.0)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
 [[package]]
 name = "cachetools"
 version = "5.3.3"
@@ -1298,6 +1344,17 @@ files = [
     {file = "packaging-24.0.tar.gz", hash = "sha256:eb82c5e3e56209074766e6885bb04b8c38a0c015d0a30036ebe7ece34c9989e9"},
 ]
 
+[[package]]
+name = "pathspec"
+version = "0.12.1"
+description = "Utility library for gitignore style pattern matching of file paths."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pathspec-0.12.1-py3-none-any.whl", hash = "sha256:a0d503e138a4c123b27490a4f7beda6a01c6f288df0e4a8b79c7eb0dc7b4cc08"},
+    {file = "pathspec-0.12.1.tar.gz", hash = "sha256:a482d51503a1ab33b1c67a6c3813a26953dbdc71c31dacaef9a838c4e29f5712"},
+]
+
 [[package]]
 name = "platformdirs"
 version = "4.2.2"
@@ -2598,4 +2655,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10.0"
-content-hash = "6e5202fa745baec580a637b9e5ca430c78ec80357e3c36ea93791e9b1dafe964"
+content-hash = "0b72ccf3d179cdad0dbbd1ac954a8b33f6655897d723d504e28ac9b626ff1775"
diff --git a/pyproject.toml b/pyproject.toml
index fd5fd21..6240717 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,3 +40,7 @@ pytest-asyncio = "^0.23.6"
 pytest-cov = "^4.1.0"
 tox = "^4.15.0"
 types-aiofiles = "^23.2.0"
+black = "^24.4.2"
+
+[tool.black]
+line_length = 120
diff --git a/tests/conftest.py b/tests/conftest.py
index 1c04dd0..ceef0ab 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -35,6 +35,7 @@ def get_config_inner():
 def client():
     tgc = test_get_config(debug_mode=False)
     from bento_service_registry.app import create_app
+
     app = create_app(tgc)
     yield TestClient(app)
 
@@ -43,12 +44,14 @@ def client():
 def client_debug_mode():
     tgc = test_get_config(debug_mode=True)
     from bento_service_registry.app import create_app
+
     app = create_app(tgc)
     yield TestClient(app)
 
 
 async def _service_info_fixt(config: Config):
     from bento_service_registry.service_info import get_service_info
+
     return await get_service_info(config, test_logger)
 
 
diff --git a/tox.ini b/tox.ini
index c85b06f..0f38e25 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,5 +9,6 @@ allowlist_externals =
 commands =
     poetry install --sync
     poetry run pytest -svv --cov=bento_service_registry --cov-branch {posargs}
+    poetry run black --check bento_service_registry tests
     poetry run flake8 ./bento_service_registry ./tests
     poetry run mypy bento_service_registry