diff --git a/src/treepuncher/storage.py b/src/treepuncher/storage.py
index 1a292a3..d5617ca 100644
--- a/src/treepuncher/storage.py
+++ b/src/treepuncher/storage.py
@@ -3,18 +3,28 @@ import json
 import sqlite3
 
 from dataclasses import dataclass
-from typing import Optional, Any
+from typing import Optional, Any, Dict
+from datetime import datetime
+
+__DATE_FORMAT__ : str = "%Y-%m-%d %H:%M:%S.%f"
 
 @dataclass
 class SystemState:
 	name : str
-	token : str
+	version : str
 	start_time : int
 
+@dataclass
+class AuthenticatorState:
+	date : datetime
+	token : Dict[str, Any]
+	legacy : bool = False
+
 class Storage:
 	name : str
 	db : sqlite3.Connection
 
+
 	def __init__(self, name:str):
 		self.name = name
 		init = not os.path.isfile(f"{name}.session")
@@ -30,14 +40,21 @@ class Storage:
 
 	def _init_db(self):
 		cur = self.db.cursor()
-		cur.execute('CREATE TABLE system (name TEXT, token TEXT, start_time LONG)')
-		cur.execute('CREATE TABLE documents (name TEXT, value TEXT)')
+		cur.execute('CREATE TABLE system (name TEXT PRIMARY KEY, version TEXT, start_time LONG)')
+		cur.execute('CREATE TABLE documents (name TEXT PRIMARY KEY, value TEXT)')
+		cur.execute('CREATE TABLE authenticator (date TEXT PRIMARY KEY, token TEXT, legacy BOOL')
 		self.db.commit()
 
 	def _set_state(self, state:SystemState):
 		cur = self.db.cursor()
 		cur.execute('DELETE FROM system')
-		cur.execute('INSERT INTO system VALUES (?, ?, ?)', (state.name, state.token, state.start_time))
+		cur.execute('INSERT INTO system VALUES (?, ?, ?)', (state.name, state.version, int(state.start_time)))
+		self.db.commit()
+
+	def _set_auth(self, state:AuthenticatorState):
+		cur = self.db.cursor()
+		cur.execute('DELETE FROM authenticator')
+		cur.execute('INSERT INTO authenticator VALUES (?, ?, ?)', (state.date.strftime(__DATE_FORMAT__), json.dumps(state.token), state.legacy))
 		self.db.commit()
 
 	def system(self) -> Optional[SystemState]:
@@ -47,10 +64,21 @@ class Storage:
 			return None
 		return SystemState(
 			name=val[0][0],
-			token=val[0][1],
+			version=val[0][1],
 			start_time=val[0][2]
 		)
 
+	def auth(self) -> Optional[AuthenticatorState]:
+		cur = self.db.cursor()
+		val = cur.execute('SELECT * FROM authenticator').fetchall()
+		if not val:
+			return None
+		return AuthenticatorState(
+			date=datetime.strptime(val[0][0], __DATE_FORMAT__),
+			token=json.loads(val[0][1]),
+			legacy=val[0][2] or False
+		)
+
 	def get(self, key:str) -> Optional[Any]:
 		cur = self.db.cursor()
 		val = cur.execute("SELECT * FROM documents WHERE name = ?", (key,)).fetchall()
diff --git a/src/treepuncher/treepuncher.py b/src/treepuncher/treepuncher.py
index 13321f3..9fd3961 100644
--- a/src/treepuncher/treepuncher.py
+++ b/src/treepuncher/treepuncher.py
@@ -4,6 +4,7 @@ import logging
 import asyncio
 import datetime
 import uuid
+import pkg_resources
 
 from typing import List, Dict, Optional, Any, Type, get_args, get_origin, get_type_hints, Set, Callable
 from time import time
@@ -15,9 +16,11 @@ from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from aiocraft.mc.packet import Packet
 from aiocraft.mc.auth import AuthInterface, AuthException, MojangAuthenticator, MicrosoftAuthenticator, OfflineAuthenticator
 
-from .storage import Storage, SystemState
+from .storage import Storage, SystemState, AuthenticatorState
 from .game import GameState, GameChat, GameInventory, GameTablist, GameWorld
 
+__VERSION__ = pkg_resources.get_distribution('treepuncher').version
+
 def parse_with_hint(val:str, hint:Any) -> Any:
 	if hint is bool:
 		if val.lower() in ['1', 'true', 't', 'on', 'enabled']:
@@ -181,11 +184,20 @@ class Treepuncher(
 		super().__init__(opt('server', required=True), online_mode=online_mode, authenticator=authenticator)
 
 		prev = self.storage.system()  # if this isn't 1st time, this won't be None. Load token from there
+		state = SystemState(self.name, __VERSION__, 0)
 		if prev:
+			state.start_time = prev.start_time
 			if self.name != prev.name:
 				self.logger.warning("Saved session belong to another user")
-			authenticator.deserialize(json.loads(prev.token))
-			self.logger.info("Loaded authenticated session")
+			if prev.version != state.version:
+				self.logger.warning("Saved session uses a different version")
+			prev_auth = self.storage.auth()
+			if prev_auth:
+				if prev_auth.legacy ^ isinstance(authenticator, MicrosoftAuthenticator):
+					self.logger.warning("Saved session is incompatible with configured authenticator")
+				authenticator.deserialize(prev_auth.token)
+				self.logger.info("Loaded session from %s", prev_auth.date)
+		self.storage._set_state(state)
 
 
 	@property
@@ -194,12 +206,12 @@ class Treepuncher(
 
 	async def authenticate(self):
 		await super().authenticate()
-		state = SystemState(
-			name=self.name,
-			token=json.dumps(self.authenticator.serialize()),
-			start_time=int(time())
+		state = AuthenticatorState(
+			date=datetime.datetime.now(),
+			token=self.authenticator.serialize(),
+			legacy=isinstance(self.authenticator, MojangAuthenticator)
 		)
-		self.storage._set_state(state)
+		self.storage._set_auth(state)
 
 	async def start(self):
 		# if self.started: # TODO readd check
@@ -213,6 +225,7 @@ class Treepuncher(
 		self._worker = asyncio.get_event_loop().create_task(self._work())
 		self.scheduler.resume()
 		self.logger.info("Treepuncher started")
+		self.storage._set_state(SystemState(self.name, __VERSION__, time()))
 
 	async def stop(self, force: bool = False):
 		self._processing = False