diff --git a/src/core/core.py b/src/core/core.py
index bfe3b0c..e0cfdae 100644
--- a/src/core/core.py
+++ b/src/core/core.py
@@ -15,6 +15,7 @@
 
     Development Team: Brain Storm Team
 """
+fVersion = open('VERSION', 'r+').readline().rstrip()
 
 CoreConfig = {
     'info': {
@@ -22,11 +23,11 @@
         'repository': 'git@github.com:stanislav-web/OpenDoor.git',
         'remote_version': 'https://raw.githubusercontent.com/stanislav-web/OpenDoor/master/VERSION',
         'license': 'License: GNU General Public License',
-        'version': '4.0.6',
+        'version': fVersion,
         'documentation': 'https://opendoor.readthedocs.org',
         'required_versions': {
             'minor': '3.7',
-            'major': '3.10'
+            'major': '3.11'
         },
     },
     'data': {
diff --git a/src/core/http/providers/header.py b/src/core/http/providers/header.py
index f2c8ee1..ed7b285 100644
--- a/src/core/http/providers/header.py
+++ b/src/core/http/providers/header.py
@@ -47,8 +47,8 @@ def add_header(self, key, value):
         :param str value: header value
         :return: HeaderProvider
         """
-        
-        self.__headers.add(key.strip(), value.strip())
+
+        self.__headers.update({key.strip(): value.strip()})
         return self
 
     @property
@@ -60,12 +60,12 @@ def _headers(self):
 
         origin = ''.join([self.__cfg.scheme, self.__cfg.host])
         referer = ''.join([self.__cfg.scheme, self.__cfg.host]) + ':' + str(self.__cfg.port)
-        self.add_header('Accept', self._accept)\
-            .add_header('Accept-Encoding', self._accept_encoding)\
+        self.add_header('Accept', self._accept) \
+            .add_header('Accept-Encoding', self._accept_encoding) \
             .add_header('Accept-Language', self._accept_language) \
-            .add_header('Origin', origin)\
-            .add_header('Referer', referer)\
-            .add_header('Cache-Control', self._cache_control)\
-            .add_header('Upgrade-Insecure-Requests', '1')\
+            .add_header('Origin', origin) \
+            .add_header('Referer', referer) \
+            .add_header('Cache-Control', self._cache_control) \
+            .add_header('Upgrade-Insecure-Requests', '1') \
             .add_header('Pragma', 'no-cache')
         return self.__headers
diff --git a/tests/test_lib_browser_debug.py b/tests/test_lib_browser_debug.py
index a0261a0..6d7338f 100644
--- a/tests/test_lib_browser_debug.py
+++ b/tests/test_lib_browser_debug.py
@@ -86,7 +86,7 @@ def test_debug_list(self):
     def test_debug_connection_pool(self):
         """ Debug.debug_connection_pool() test """
 
-        self.assertTrue(self.debug.debug_connection_pool('http_pool_start', ''))
+        self.assertTrue(self.debug.debug_connection_pool('http_pool_start', '', ''))
 
     def test_debug_proxy_pool(self):
         """ Debug.debug_proxy_pool() test """