diff --git a/sigma/exceptions.py b/sigma/exceptions.py
index aca58008..b83f8925 100644
--- a/sigma/exceptions.py
+++ b/sigma/exceptions.py
@@ -83,11 +83,13 @@ class SigmaDateError(SigmaError):
 
     pass
 
+
 class SigmaFieldsError(SigmaError):
     """Error in Sigma rule fields"""
 
     pass
 
+
 class SigmaFalsePositivesError(SigmaError):
     """Error in Sigma rule falsepositives"""
 
diff --git a/sigma/pipelines/common.py b/sigma/pipelines/common.py
index 26ad3fcf..cf58e239 100644
--- a/sigma/pipelines/common.py
+++ b/sigma/pipelines/common.py
@@ -66,23 +66,27 @@ def logsource_windows(service: str) -> LogsourceCondition:
         service=service,
     )
 
+
 def logsource_linux(service: str) -> LogsourceCondition:
     return LogsourceCondition(
         product="linux",
         service=service,
     )
 
+
 def logsource_macos(service: str) -> LogsourceCondition:
     return LogsourceCondition(
         product="macos",
         service=service,
     )
 
+
 def logsource_category(category: str) -> LogsourceCondition:
     return LogsourceCondition(
         category=category,
     )
 
+
 def logsource_windows_process_creation() -> LogsourceCondition:
     return LogsourceCondition(
         category="process_creation",
@@ -273,42 +277,49 @@ def logsource_linux_file_create() -> LogsourceCondition:
         product="linux",
     )
 
+
 def logsource_macos_process_creation() -> LogsourceCondition:
     return LogsourceCondition(
         category="process_creation",
         product="macos",
     )
 
+
 def logsource_macos_file_create() -> LogsourceCondition:
     return LogsourceCondition(
         category="file_create",
         product="macos",
     )
 
+
 def logsource_azure_riskdetection() -> LogsourceCondition:
     return LogsourceCondition(
         category="riskdetection",
         product="azure",
     )
 
+
 def logsource_azure_pim() -> LogsourceCondition:
     return LogsourceCondition(
         category="pim",
         product="azure",
     )
 
+
 def logsource_azure_auditlogs() -> LogsourceCondition:
     return LogsourceCondition(
         category="auditlogs",
         product="azure",
     )
 
+
 def logsource_azure_azureactivity() -> LogsourceCondition:
     return LogsourceCondition(
         category="azureactivity",
         product="azure",
     )
 
+
 def logsource_azure_signinlogs() -> LogsourceCondition:
     return LogsourceCondition(
         category="signinlogs",
diff --git a/sigma/rule.py b/sigma/rule.py
index 556c8329..91c32646 100644
--- a/sigma/rule.py
+++ b/sigma/rule.py
@@ -715,7 +715,7 @@ def from_dict(
                 )
             )
             raise SigmaTypeError("Sigma rule fields must be a list", source=source)
-        
+
         # validate falsepositives
         rule_falsepositives = rule.get("falsepositives")
         if rule_falsepositives is not None and not isinstance(rule_fields, list):
diff --git a/sigma/validators/core/metadata.py b/sigma/validators/core/metadata.py
index a3839d23..a7f77376 100644
--- a/sigma/validators/core/metadata.py
+++ b/sigma/validators/core/metadata.py
@@ -51,6 +51,7 @@ def finalize(self) -> List[SigmaValidationIssue]:
             IdentifierCollisionIssue(rules, id) for id, rules in self.ids.items() if len(rules) > 1
         ]
 
+
 @dataclass
 class TitleLengthIssue(SigmaValidationIssue):
     description = "Rule has a title longer than 100 characters"
@@ -66,6 +67,7 @@ def validate(self, rule: SigmaRule) -> List[SigmaValidationIssue]:
         else:
             return []
 
+
 @dataclass
 class DuplicateTitleIssue(SigmaValidationIssue):
     description: ClassVar[str] = "Rule title used by multiple rules"
@@ -88,5 +90,7 @@ def validate(self, rule: SigmaRule) -> List[SigmaValidationIssue]:
 
     def finalize(self) -> List[SigmaValidationIssue]:
         return [
-            DuplicateTitleIssue(rules, title) for title, rules in self.titles.items() if len(rules) > 1
-        ]
\ No newline at end of file
+            DuplicateTitleIssue(rules, title)
+            for title, rules in self.titles.items()
+            if len(rules) > 1
+        ]
diff --git a/tests/test_validators.py b/tests/test_validators.py
index 3b1584a4..6d3f0b99 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -816,6 +816,7 @@ def test_validator_escaped_wildcard_valid():
     )
     assert validator.validate(rule) == []
 
+
 def test_validator_lengthy_title():
     validator = TitleLengthValidator()
     rule = SigmaRule.from_yaml(
@@ -832,6 +833,7 @@ def test_validator_lengthy_title():
     )
     assert validator.validate(rule) == [TitleLengthIssue([rule])]
 
+
 def test_validator_lengthy_title_valid():
     validator = TitleLengthValidator()
     rule = SigmaRule.from_yaml(
@@ -848,6 +850,7 @@ def test_validator_lengthy_title_valid():
     )
     assert validator.validate(rule) == []
 
+
 def test_validator_duplicate_title():
     validator = DuplicateTitleValidator()
     rule = SigmaRule.from_yaml(
@@ -864,6 +867,7 @@ def test_validator_duplicate_title():
     )
     assert validator.validate(rule) == [DuplicateTitleIssue([rule])]
 
+
 def test_validator_duplicate_title_valid():
     validator = DuplicateTitleValidator()
     rule1 = SigmaRule.from_yaml(
@@ -891,4 +895,4 @@ def test_validator_duplicate_title_valid():
         condition: sel
     """
     )
-    assert validator.validate(rule1) == validator.validate(rule2)
\ No newline at end of file
+    assert validator.validate(rule1) == validator.validate(rule2)