diff --git a/config_converter/converters/yaml_converter.py b/config_converter/converters/yaml_converter.py
index 70f8c18..d1cf0e6 100644
--- a/config_converter/converters/yaml_converter.py
+++ b/config_converter/converters/yaml_converter.py
@@ -1,7 +1,7 @@
 """YAML format converter."""
 
 from pathlib import Path
-from typing import Any, Dict
+from typing import Any, Dict, Union
 
 import yaml
 
@@ -14,7 +14,7 @@ class YamlConverter(BaseConverter):
     FORMAT_NAME = "yaml"
     FILE_EXTENSIONS = ["yaml", "yml"]
 
-    def read(self, source: str | Path) -> Dict[str, Any]:
+    def read(self, source: Union[str, Path]) -> Dict[str, Any]:
         """Read and parse a YAML configuration file."""
         try:
             with open(source, "r", encoding="utf-8") as f:
@@ -26,7 +26,7 @@ class YamlConverter(BaseConverter):
         except PermissionError as e:
             raise ConversionError(f"Permission denied: {source}") from e
 
-    def write(self, data: Dict[str, Any], target: str | Path) -> None:
+    def write(self, data: Dict[str, Any], target: Union[str, Path]) -> None:
         """Write configuration data to a YAML file."""
         try:
             with open(target, "w", encoding="utf-8") as f: