diff --git a/fritz_advanced_thermostat/fritz_advanced_thermostat.py b/fritz_advanced_thermostat/fritz_advanced_thermostat.py
index a7aa63a..9bafeac 100644
--- a/fritz_advanced_thermostat/fritz_advanced_thermostat.py
+++ b/fritz_advanced_thermostat/fritz_advanced_thermostat.py
@@ -2,7 +2,6 @@
 import re
 import requests
 from .errors import FritzAdvancedThermostatConnectionError, FritzAdvancedThermostatCompatibilityError, FritzAdvancedThermostatExecutionError, FritzAdvancedThermostatKeyError
-from fritzconnection import FritzConnection
 from pyfritzhome import Fritzhome
 from selenium import webdriver
 from selenium.webdriver.chrome.options import Options
@@ -55,9 +54,7 @@ def __init__(self,
         self._sid = fh._sid
         self._devices = fh._devices
         self._prefixed_host = fh.get_prefixed_host()
-        # Check Fritz!OS via FritzConnection
-        fc = FritzConnection(address=host, user=user, password=password)
-        self._fritzos = fc.system_version
+        self._fritzos = self._load_fritzos()
         self._supported_firmware = ['7.29', '7.30', '7.31', '7.56', '7.57']
         # Set basic properties
         self._experimental = experimental
@@ -100,6 +97,18 @@ def __init__(self,
             self._selenium_options.add_argument('ignore-certificate-errors')
         self._check_fritzos()
 
+    def _load_fritzos(self):
+        data = {
+            "xhr": 1,
+            "sid": self._sid,
+            "page": "overview",
+        }
+
+        response = requests.post(self._prefixed_host + "/data.lua", data=data, allow_redirects=True, timeout=300)
+        response.raise_for_status()
+
+        return json.loads(response.text)["data"]["fritzos"]["nspver"]
+
     def _check_fritzos(self):
         if self._fritzos not in self._supported_firmware:
             if self._experimental:
diff --git a/requirements.txt b/requirements.txt
index c518f1f..0bc2dd3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-fritzconnection>=1.12.2
 pyfritzhome>=0.6.8
 requests>=2.31.0
 selenium==4.10.0