diff --git a/aiogram/dispatcher/filters/command.py b/aiogram/dispatcher/filters/command.py
index 3299bb7b..c97f79fa 100644
--- a/aiogram/dispatcher/filters/command.py
+++ b/aiogram/dispatcher/filters/command.py
@@ -2,15 +2,13 @@ from __future__ import annotations
 
 import re
 from dataclasses import dataclass, field
-from typing import Any, AnyStr, Dict, List, Match, Optional, Pattern, Union
-
-from pydantic import root_validator
+from typing import Any, Dict, List, Match, Optional, Pattern, Union
 
 from aiogram import Bot
 from aiogram.api.types import Message
 from aiogram.dispatcher.filters import BaseFilter
 
-CommandPatterType = Union[str, re.Pattern]
+CommandPatterType = Union[str, re.Pattern]  # type: ignore
 
 
 class Command(BaseFilter):
@@ -19,14 +17,6 @@ class Command(BaseFilter):
     commands_ignore_case: bool = False
     commands_ignore_mention: bool = False
 
-    @root_validator
-    def validate_constraints(cls, values: Dict[str, Any]) -> Dict[str, Any]:
-        if "commands" not in values:
-            raise ValueError("Commands required")
-        if not isinstance(values["commands"], list):
-            values["commands"] = [values["commands"]]
-        return values
-
     async def __call__(self, message: Message, bot: Bot) -> Union[bool, Dict[str, Any]]:
         if not message.text:
             return False
@@ -54,12 +44,10 @@ class Command(BaseFilter):
             return False
 
         # Validate mention
-        if (
-            mention
-            and not self.commands_ignore_mention
-            and mention.lower() != (await bot.me()).username.lower()
-        ):
-            return False
+        if mention and not self.commands_ignore_mention:
+            me = await bot.me()
+            if me.username and mention.lower() != me.username.lower():
+                return False
 
         # Validate command
         for allowed_command in self.commands:
@@ -106,17 +94,18 @@ class CommandObject:
     """Command prefix"""
     command: str = ""
     """Command without prefix and mention"""
-    mention: str = None
+    mention: Optional[str] = None
     """Mention (if available)"""
-    args: str = field(repr=False, default=None)
+    args: Optional[str] = field(repr=False, default=None)
     """Command argument"""
-    match: Optional[Match[AnyStr]] = None
+    match: Optional[Match[str]] = field(repr=False, default=None)
     """Will be presented match result if the command is presented as regexp in filter"""
 
     @property
     def mentioned(self) -> bool:
         """
         This command has mention?
+
         :return:
         """
         return bool(self.mention)
@@ -125,10 +114,11 @@ class CommandObject:
     def text(self) -> str:
         """
         Generate original text from object
+
         :return:
         """
         line = self.prefix + self.command
-        if self.mentioned:
+        if self.mention:
             line += "@" + self.mention
         if self.args:
             line += " " + self.args
diff --git a/aiogram/dispatcher/handler/message.py b/aiogram/dispatcher/handler/message.py
index 2afdbf7b..e08ec11f 100644
--- a/aiogram/dispatcher/handler/message.py
+++ b/aiogram/dispatcher/handler/message.py
@@ -22,5 +22,5 @@ class MessageHandlerCommandMixin(BaseHandlerMixin):
     @property
     def command(self) -> Optional[CommandObject]:
         if "command" in self.data:
-            return self.command["data"]
+            return self.data["command"]
         return None
diff --git a/tests/test_dispatcher/test_filters/test_command.py b/tests/test_dispatcher/test_filters/test_command.py
new file mode 100644
index 00000000..5649be86
--- /dev/null
+++ b/tests/test_dispatcher/test_filters/test_command.py
@@ -0,0 +1,6 @@
+from aiogram.dispatcher.filters import Command
+
+
+class TestCommandFilter:
+    def test_validator(self):
+        pass
diff --git a/tests/test_dispatcher/test_handler/test_message.py b/tests/test_dispatcher/test_handler/test_message.py
index e5fd3194..4b9741cb 100644
--- a/tests/test_dispatcher/test_handler/test_message.py
+++ b/tests/test_dispatcher/test_handler/test_message.py
@@ -4,7 +4,8 @@ from typing import Any
 import pytest
 
 from aiogram.api.types import Chat, Message, User
-from aiogram.dispatcher.handler.message import MessageHandler
+from aiogram.dispatcher.filters import CommandObject
+from aiogram.dispatcher.handler.message import MessageHandler, MessageHandlerCommandMixin
 
 
 class MyHandler(MessageHandler):
@@ -26,3 +27,25 @@ class TestClassBasedMessageHandler:
 
         assert handler.from_user == event.from_user
         assert handler.chat == event.chat
+
+
+class HandlerWithCommand(MessageHandlerCommandMixin, MessageHandler):
+    async def handle(self) -> Any:
+        return self.command
+
+
+class TestBaseMessageHandlerCommandMixin:
+    def test_command_accessible(self):
+        handler = HandlerWithCommand(
+            Message(
+                message_id=42,
+                date=datetime.datetime.now(),
+                text="test",
+                chat=Chat(id=42, type="private"),
+                from_user=User(id=42, is_bot=False, first_name="Test"),
+            ),
+            command=CommandObject(prefix="/", command="command", args="args"),
+        )
+
+        assert isinstance(handler.command, CommandObject)
+        assert handler.command.command == "command"