diff --git a/src/pychangelogfactory/changelogfactory.py b/src/pychangelogfactory/changelogfactory.py
index 6da465e..93fd8f7 100644
--- a/src/pychangelogfactory/changelogfactory.py
+++ b/src/pychangelogfactory/changelogfactory.py
@@ -24,7 +24,7 @@ from typing import TYPE_CHECKING
 from typing import Generic, TypeVar, cast
 
 if TYPE_CHECKING:
-    from typing import Optional, ClassVar, Type, Dict
+    from typing import Optional, ClassVar, Type, Dict, List
 
 T_ChangelogFormater = TypeVar("T_ChangelogFormater", bound="ChangelogFormater")
 
@@ -119,11 +119,11 @@ class ChangelogFormater(ABC):
     title: ClassVar[Optional[str]] = None
     keywords: ClassVar[Optional[list[str]]] = None
     priority: ClassVar[int] = 0
-    _lines: list[None | str] = []
+    _lines: List[None | str] = []
 
     def __init__(self) -> None:
         """ChangelogFormater class constructor"""
-        self._lines: list[None | str] = []
+        self._lines: List[None | str] = []
 
     def Clear(self) -> None:
         """Clear the formater content"""
@@ -450,7 +450,7 @@ class ChangelogFormater_revert(ChangelogFormater):
 
     prefix: ClassVar[Optional[str]] = "revert"
     title: ClassVar[Optional[str]] = "Reverts :back: :"
-    keywords: ClassVar[Optional[list[str]]] = ["revert", "fallback"]
+    keywords: ClassVar[Optional[List[str]]] = ["revert", "fallback"]
     priority: ClassVar[int] = 0
 
     def RenderLines(self) -> str:
@@ -470,5 +470,5 @@ class ChangelogFormater_others(ChangelogFormater):
 
     prefix: ClassVar[Optional[str]] = "other"
     title: ClassVar[Optional[str]] = "Others :question: :"
-    keywords: ClassVar[Optional[list[str]]] = [""]
+    keywords: ClassVar[Optional[List[str]]] = [""]
     priority: ClassVar[int] = -20