diff --git a/aiomax/bot.py b/aiomax/bot.py
index 1550579..6ddf9a3 100644
--- a/aiomax/bot.py
+++ b/aiomax/bot.py
@@ -60,7 +60,7 @@ def __init__(
         super().__init__(case_sensitive)
 
         self.access_token: str = access_token
-        self.session = None
+        self.session: aiohttp.ClientSession | None = None
         self.polling = False
 
         self.command_prefixes: str | list[str] = command_prefixes
@@ -76,7 +76,7 @@ def __init__(
         self.username: str | None = None
         self.name: str | None = None
         self.description: str | None = None
-        self.bot_commands: list[BotCommand] = None
+        self.bot_commands: list[BotCommand] | None = None
 
         self.marker: int | None = None
 
diff --git a/aiomax/router.py b/aiomax/router.py
index e9a636d..2454737 100644
--- a/aiomax/router.py
+++ b/aiomax/router.py
@@ -37,7 +37,7 @@ def __init__(
             str, list[CommandHandler]
         ] = {}  # commands in this router
         self.case_sensitive: bool = case_sensitive
-        self.parent = None  # Parent bot of this router
+        self.parent: Router | None = None  # Parent bot of this router
         self.routers: list[Router] = []
         self.filters: dict[str, list[Callable]] = {
             "message_created": [],
diff --git a/aiomax/types.py b/aiomax/types.py
index 7b58f6c..5c86a6a 100644
--- a/aiomax/types.py
+++ b/aiomax/types.py
@@ -38,7 +38,7 @@ def __init__(
         self.name: str = name
         self.username: "str | None" = username
         self.is_bot: bool = is_bot
-        self.last_activity_time: int = (
+        self.last_activity_time: float | None = (
             last_activity_time / 1000 if last_activity_time else None
         )
         self.description: "str | None" = description
@@ -52,7 +52,7 @@ def __init__(
         )
         self.is_owner: "bool | None" = is_owner
         self.is_admin: "bool | None" = is_admin
-        self.join_time: "int | None" = join_time / 1000 if join_time else None
+        self.join_time: "float | None" = join_time / 1000 if join_time else None
         self.permissions: "list[str] | None" = permissions
 
     def __repr__(self):
@@ -429,7 +429,7 @@ def __eq__(self, other):
         return False
 
     @staticmethod
-    def from_json(data: dict) -> "MessageRecipient":
+    def from_json(data: dict) -> "MessageRecipient | None":
         if data is None:
             return None
 
@@ -523,7 +523,7 @@ def __init__(
         self.markup: "list[Markup] | None" = markup
 
     @staticmethod
-    def from_json(data: dict) -> "MessageBody":
+    def from_json(data: dict) -> "MessageBody | None":
         if data is None:
             return None
 
@@ -552,7 +552,7 @@ def __init__(
         self.chat_id: "int | None" = chat_id
 
     @staticmethod
-    def from_json(data: dict) -> "LinkedMessage":
+    def from_json(data: dict) -> "LinkedMessage | None":
         if data is None:
             return None
 
@@ -706,7 +706,7 @@ async def reply(
         | buttons.KeyboardBuilder \
         | None""" = None,
         attachments: "list[Attachment] | Attachment | None" = None,
-    ) -> "Message":
+    ) -> "Message | None":
         """
         Reply to this message.
 
@@ -742,7 +742,7 @@ async def edit(
         | buttons.KeyboardBuilder \
         | None""" = None,
         attachments: "list[Attachment] | Attachment | None" = None,
-    ) -> "Message":
+    ) -> "Message | None":
         """
         Edit a message
 
@@ -812,7 +812,7 @@ async def send(
         | buttons.KeyboardBuilder \
         | None""" = None,
         attachments: "list[Attachment] | Attachment | None" = None,
-    ) -> "Message":
+    ) -> "Message | None":
         """
         Send a message to the chat where bot was started.
 
@@ -1040,7 +1040,7 @@ def __init__(
         self.chat_id: int = chat_id
         self.type: str = type
         self.status: str = status
-        self.last_event_time: int = (
+        self.last_event_time: float | None = (
             last_event_time / 1000 if last_event_time else None
         )
         self.participants_count: int = participants_count
@@ -1091,7 +1091,7 @@ def __init__(
         payload: "str | None" = None,
     ):
         self.bot = bot
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.callback_id: str = callback_id
         self.message: "Message | None" = message
         self.user: User = user
@@ -1115,7 +1115,7 @@ async def send(
         | buttons.KeyboardBuilder \
         | None""" = None,
         attachments: "list[Attachment] | Attachment | None" = None,
-    ) -> "Message":
+    ) -> "Message | None":
         """
         Send a message to the chat that contains the message
             with the pressed button.
@@ -1155,7 +1155,7 @@ async def reply(
         | buttons.KeyboardBuilder \
         | None""" = None,
         attachments: "list[Attachment] | Attachment | None" = None,
-    ) -> "Message":
+    ) -> "Message | None":
         """
         Reply to the message with the button.
 
@@ -1283,7 +1283,7 @@ def __init__(
         :param message_id: Message ID on which the button was
         :param start_payload: Start payload specified by the button
         """
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.chat: Chat = chat
         self.message_id: "str | None" = message_id
         self.start_payload: "str | None" = start_payload
@@ -1321,7 +1321,7 @@ def __init__(
         :param chat_id: ID of the chat the message was deleted in
         :param user_id: ID of the user who deleted the message
         """
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.message: "Message | None" = message
         self.message_id: "str | None" = message_id
         self.chat_id: "int | None" = chat_id
@@ -1366,7 +1366,7 @@ def __init__(
         :param chat_id: Chat ID that had its title edited.
         :param title: New chat title
         """
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.user: User = user
         self.chat_id: "int | None" = chat_id
         self.title: "str | None" = title
@@ -1406,7 +1406,7 @@ def __init__(
         :param is_channel: Whether the bot got added to / kicked
         from a channel or not
         """
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.user: User = user
         self.chat_id: "int | None" = chat_id
         self.is_channel: bool = is_channel
@@ -1449,7 +1449,7 @@ def __init__(
         :param initiator: User ID of the inviter / kicker,
         if the user got invited by another user or kicked by an admin.
         """
-        self.timestamp: int = timestamp / 1000
+        self.timestamp: float = timestamp / 1000
         self.user: User = user
         self.chat_id: "int | None" = chat_id
         self.is_channel: bool = is_channel
diff --git a/aiomax/utils.py b/aiomax/utils.py
index 96861d7..910258f 100644
--- a/aiomax/utils.py
+++ b/aiomax/utils.py
@@ -1,5 +1,5 @@
 from inspect import signature
-from typing import Callable, Literal
+from typing import Any, Callable, Literal
 
 import aiohttp
 
@@ -21,7 +21,7 @@ def get_message_body(
     """
     Returns the body of the message as json.
     """
-    body = {"text": text, "format": format, "notify": notify}
+    body: dict[str, Any] = {"text": text, "format": format, "notify": notify}
 
     # replying
     if reply_to:
@@ -57,7 +57,7 @@ def get_message_body(
         for at in attachments or []:
             if not hasattr(at, "as_dict"):
                 raise exceptions.AiomaxException(
-                    "This attachmentcannot be sent"
+                    "This attachment cannot be sent"
                 )
             body["attachments"].append(at.as_dict())