diff --git a/loglens/parsers/base.py b/loglens/parsers/base.py
index 0dabeb9..46b4c3b 100644
--- a/loglens/parsers/base.py
+++ b/loglens/parsers/base.py
@@ -1,14 +1,15 @@
-"""Base parser class and data structures."""
+'''Base parser class and data structures.'''
 
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from datetime import datetime
-from typing import Any, Dict, List, Optional
 from enum import Enum
+from typing import Any, Optional
 
 
 class LogFormat(Enum):
-    """Supported log formats."""
+    '''Supported log formats.'''
+
     JSON = "json"
     SYSLOG = "syslog"
     APACHE = "apache"
@@ -17,7 +18,8 @@ class LogFormat(Enum):
 
 @dataclass
 class ParsedLogEntry:
-    """Represents a parsed log entry."""
+    '''Represents a parsed log entry.'''
+
     raw_line: str
     timestamp: Optional[datetime] = None
     level: Optional[str] = None
@@ -27,12 +29,12 @@ class ParsedLogEntry:
     facility: Optional[str] = None
     severity: Optional[str] = None
     logger: Optional[str] = None
-    extra: Dict[str, Any] = field(default_factory=dict)
+    extra: dict[str, Any] = field(default_factory=dict)
     line_number: int = 0
     error_pattern: Optional[str] = None
 
-    def to_dict(self) -> Dict[str, Any]:
-        """Convert to dictionary."""
+    def to_dict(self) -> dict[str, Any]:
+        '''Convert to dictionary.'''
         result = {
             "raw_line": self.raw_line,
             "message": self.message,
@@ -60,22 +62,22 @@ class ParsedLogEntry:
 
 
 class LogParser(ABC):
-    """Abstract base class for log parsers."""
+    '''Abstract base class for log parsers.'''
 
     format_name: str = "base"
 
     @abstractmethod
     def parse(self, line: str, line_number: int = 0) -> Optional[ParsedLogEntry]:
-        """Parse a single log line."""
+        '''Parse a single log line.'''
         pass
 
     @abstractmethod
     def can_parse(self, line: str) -> bool:
-        """Check if this parser can handle the given line."""
+        '''Check if this parser can handle the given line.'''
         pass
 
-    def parse_batch(self, lines: List[str]) -> List[ParsedLogEntry]:
-        """Parse multiple lines."""
+    def parse_batch(self, lines: list[str]) -> list[ParsedLogEntry]:
+        '''Parse multiple lines.'''
         results = []
         for i, line in enumerate(lines, 1):
             try:
@@ -83,9 +85,5 @@ class LogParser(ABC):
                 if entry:
                     results.append(entry)
             except Exception:
-                results.append(ParsedLogEntry(
-                    raw_line=line,
-                    message="Parse error",
-                    line_number=i
-                ))
+                results.append(ParsedLogEntry(raw_line=line, message="Parse error", line_number=i))
         return results