diff --git a/README.md b/README.md
index abad666..3f31fbb 100644
--- a/README.md
+++ b/README.md
@@ -17,32 +17,28 @@ client = epo_ops.Client(key="abc", secret="xyz")
 
 # Retrieve bibliography data.
 response = client.published_data(
-
-  # publication, application, priority
-  reference_type="publication",
-
-  # docdb, epodoc
-  input=epo_ops.models.Docdb("1000000", "EP", "A1"),
-
-  # optional, defaults to biblio in case of published_data
-  endpoint="biblio",
-
-  # optional, list of constituents
-  constituents=[],
+    # publication, application, priority
+    reference_type="publication",
+    # docdb, epodoc
+    input=epo_ops.models.Docdb("1000000", "EP", "A1"),
+    # optional, defaults to biblio in case of published_data
+    endpoint="biblio",
+    # optional, list of constituents
+    constituents=[],
 )
 
 # Retrieve description.
 response = client.published_data(
-  reference_type="publication",
-  input=epo_ops.models.Docdb("1000000", "EP", "A1"),
-  endpoint="description",
+    reference_type="publication",
+    input=epo_ops.models.Docdb("1000000", "EP", "A1"),
+    endpoint="description",
 )
 
 # Retrieve claims.
 response = client.published_data(
-  reference_type="publication",
-  input=epo_ops.models.Docdb("1000000", "EP", "A1"),
-  endpoint="claims",
+    reference_type="publication",
+    input=epo_ops.models.Docdb("1000000", "EP", "A1"),
+    endpoint="claims",
 )
 ```
 
@@ -134,8 +130,8 @@ middlewares = [
     epo_ops.middlewares.Throttler(),
 ]
 client = epo_ops.Client(
-    key='key',
-    secret='secret',
+    key="key",
+    secret="secret",
     middlewares=middlewares,
 )
 ```
diff --git a/pyproject.toml b/pyproject.toml
index c816df0..346c460 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -80,15 +80,15 @@ lint.mccabe.max-complexity = 7
 
 [tool.pytest]
 ini_options.minversion = "2.0"
+ini_options.testpaths = [ "tests" ]
 ini_options.addopts = """
   -rsfEX -p pytester --strict-markers --verbosity=3
   --cov=epo_ops tests --cov-report=term-missing --cov-report=xml
   """
+ini_options.markers = []
+ini_options.xfail_strict = true
 ini_options.log_level = "DEBUG"
 ini_options.log_cli_level = "DEBUG"
-ini_options.testpaths = [ "tests" ]
-ini_options.xfail_strict = true
-ini_options.markers = []
 
 [tool.versioningit]
 vcs.method = "git-archive"
diff --git a/setup.py b/setup.py
index 581b729..6576b67 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
     extras_require={
         "develop": [
             "pyproject-fmt<3",
-            "ruff<0.17; python_version >= '3.7'",
+            "ruff==0.17.*; python_version >= '3.7'",
             "twine<8",
             "wheel<1",
         ],