diff --git a/src/argenta/command/flag/models.py b/src/argenta/command/flag/models.py
index 4e0f79d..7e1546f 100644
--- a/src/argenta/command/flag/models.py
+++ b/src/argenta/command/flag/models.py
@@ -43,7 +43,7 @@ class Flag(BaseFlag):
         self,
         name: str,
         prefix: Literal["-", "--", "---"] = "--",
-        possible_values: list[str] | Pattern[str] | False = True,
+        possible_values: list[str] | Pattern[str] | bool = True,
     ) -> None:
         """
         Public. The entity of the flag being registered for subsequent processing
diff --git a/src/argenta/router/entity.py b/src/argenta/router/entity.py
index d4b6bf3..54d8596 100644
--- a/src/argenta/router/entity.py
+++ b/src/argenta/router/entity.py
@@ -158,7 +158,7 @@ class Router:
         )
 
     @staticmethod
-    def _validate_command(command: Command | str) -> None:
+    def _validate_command(command: Command) -> None:
         """
         Private. Validates the command registered in handler
         :param command: validated command