diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..a04c33e
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,6 @@
+repos:
+-   repo: https://github.com/psf/black
+    rev: 22.10.0
+    hooks:
+    - id: black
+      language_version: python3.8
\ No newline at end of file
diff --git a/fhirpy/base/lib.py b/fhirpy/base/lib.py
index a8a8142..c418768 100644
--- a/fhirpy/base/lib.py
+++ b/fhirpy/base/lib.py
@@ -108,7 +108,9 @@ def _build_request_url(self, path, params):
 class AsyncClient(AbstractClient, ABC):
     aiohttp_config = None
 
-    def __init__(self, url, authorization=None, extra_headers=None, aiohttp_config=None):
+    def __init__(
+        self, url, authorization=None, extra_headers=None, aiohttp_config=None
+    ):
         self.aiohttp_config = aiohttp_config or {}
 
         super().__init__(url, authorization, extra_headers)
@@ -125,8 +127,7 @@ async def _do_request(self, method, path, data=None, params=None):
             ) as r:
                 if 200 <= r.status < 300:
                     data = await r.text()
-                    return (json.loads(data, object_hook=AttrDict)
-                        if data else None)
+                    return json.loads(data, object_hook=AttrDict) if data else None
 
                 if r.status == 404 or r.status == 410:
                     raise ResourceNotFound(await r.text())
@@ -147,7 +148,9 @@ async def _fetch_resource(self, path, params=None):
 class SyncClient(AbstractClient, ABC):
     requests_config = None
 
-    def __init__(self, url, authorization=None, extra_headers=None, requests_config=None):
+    def __init__(
+        self, url, authorization=None, extra_headers=None, requests_config=None
+    ):
         self.requests_config = requests_config or {}
 
         super().__init__(url, authorization, extra_headers)
@@ -158,7 +161,9 @@ def execute(self, path, method="post", **kwargs):
     def _do_request(self, method, path, data=None, params=None):
         headers = self._build_request_headers()
         url = self._build_request_url(path, params)
-        r = requests.request(method, url, json=data, headers=headers, **self.requests_config)
+        r = requests.request(
+            method, url, json=data, headers=headers, **self.requests_config
+        )
 
         if 200 <= r.status_code < 300:
             return (
diff --git a/requirements.txt b/requirements.txt
index bce38b7..aed3f10 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,6 @@ pytest-cov==2.12.0
 aiohttp==3.7.4
 pytest-asyncio==0.15.1
 responses==0.13.3
-yapf==0.31.0
-pytz==2021.1
\ No newline at end of file
+pytz==2021.1
+black==22.10.0
+pre-commit==2.20.0
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index d628318..20450ab 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,3 @@
 [metadata]
 license_file = LICENSE.md
 description-file = README.md
-
-[yapf]
-based_on_style = facebook
diff --git a/tests/test_lib_async.py b/tests/test_lib_async.py
index a74661a..fc748b1 100644
--- a/tests/test_lib_async.py
+++ b/tests/test_lib_async.py
@@ -597,27 +597,19 @@ async def test_aiohttp_config():
     client = AsyncFHIRClient(
         FHIR_SERVER_URL,
         authorization=FHIR_SERVER_AUTHORIZATION,
-        aiohttp_config={
-            "ssl": False,
-            "proxy": "http://example.com"
-        }
+        aiohttp_config={"ssl": False, "proxy": "http://example.com"},
     )
     resp = MockAiohttpResponse(
         bytes(
             json.dumps(
-                {
-                    'resourceType': 'Bundle',
-                    'type': 'searchset',
-                    'total': 0,
-                    'entry': []
-                }
-            ), 'utf-8'
-        ), 200
+                {"resourceType": "Bundle", "type": "searchset", "total": 0, "entry": []}
+            ),
+            "utf-8",
+        ),
+        200,
     )
-    with patch(
-        "aiohttp.ClientSession.request", return_value=resp
-    ) as patched_request:
-        await client.resources('Patient').first()
+    with patch("aiohttp.ClientSession.request", return_value=resp) as patched_request:
+        await client.resources("Patient").first()
         patched_request.assert_called_with(
-            ANY, ANY, json=None, ssl=False, proxy='http://example.com'
+            ANY, ANY, json=None, ssl=False, proxy="http://example.com"
         )
diff --git a/tests/test_lib_sync.py b/tests/test_lib_sync.py
index f42df04..86f3825 100644
--- a/tests/test_lib_sync.py
+++ b/tests/test_lib_sync.py
@@ -541,22 +541,14 @@ def test_requests_config():
     client = SyncFHIRClient(
         FHIR_SERVER_URL,
         authorization=FHIR_SERVER_AUTHORIZATION,
-        requests_config={
-            "verify": False,
-            "cert": "some_cert"
-        }
+        requests_config={"verify": False, "cert": "some_cert"},
     )
     json_resp_str = json.dumps(
-        {
-            'resourceType': 'Bundle',
-            'type': 'searchset',
-            'total': 0,
-            'entry': []
-        }
+        {"resourceType": "Bundle", "type": "searchset", "total": 0, "entry": []}
     )
-    resp = MockRequestsResponse(bytes(json_resp_str, 'utf-8'), 200)
+    resp = MockRequestsResponse(bytes(json_resp_str, "utf-8"), 200)
     with patch("requests.request", return_value=resp) as patched_request:
-        client.resources('Patient').first()
+        client.resources("Patient").first()
         patched_request.assert_called_with(
-            ANY, ANY, json=ANY, headers=ANY, verify=False, cert='some_cert'
+            ANY, ANY, json=ANY, headers=ANY, verify=False, cert="some_cert"
         )