diff --git a/neptune/internal/backends/hosted_neptune_backend.py b/neptune/internal/backends/hosted_neptune_backend.py
index e0991b9ad..1fff2cf1a 100644
--- a/neptune/internal/backends/hosted_neptune_backend.py
+++ b/neptune/internal/backends/hosted_neptune_backend.py
@@ -46,7 +46,7 @@
 from neptune.notebook import Notebook
 from neptune.oauth import NeptuneAuthenticator
 from neptune.projects import Project
-from neptune.utils import is_float, with_api_exceptions_handler
+from neptune.utils import is_float, with_api_exceptions_handler, update_session_proxies
 
 _logger = logging.getLogger(__name__)
 
@@ -63,8 +63,8 @@ def __init__(self, api_token=None, proxies=None):
             ssl_verify = False
 
         self._http_client = RequestsClient(ssl_verify=ssl_verify)
-        if proxies is not None:
-            self._update_proxies(proxies)
+
+        update_session_proxies(self._http_client.session, proxies)
 
         self.backend_swagger_client = self._get_swagger_client('{}/api/backend/swagger.json'
                                                                .format(self.api_address))
@@ -72,7 +72,7 @@ def __init__(self, api_token=None, proxies=None):
         self.leaderboard_swagger_client = self._get_swagger_client('{}/api/leaderboard/swagger.json'
                                                                    .format(self.api_address))
 
-        self.authenticator = self._create_authenticator(self.credentials.api_token, ssl_verify)
+        self.authenticator = self._create_authenticator(self.credentials.api_token, ssl_verify, proxies)
         self._http_client.authenticator = self.authenticator
 
         # This is not a top-level import because of circular dependencies
@@ -872,12 +872,6 @@ def _upload_tar_data(self, experiment, api_method, data):
         response.raise_for_status()
         return response
 
-    def _update_proxies(self, proxies):
-        try:
-            self._http_client.session.proxies.update(proxies)
-        except (TypeError, ValueError):
-            raise ValueError("Wrong proxies format: {}".format(proxies))
-
     @with_api_exceptions_handler
     def _get_swagger_client(self, url):
         return SwaggerClient.from_url(
@@ -892,10 +886,11 @@ def _get_swagger_client(self, url):
         )
 
     @with_api_exceptions_handler
-    def _create_authenticator(self, api_token, ssl_verify):
+    def _create_authenticator(self, api_token, ssl_verify, proxies):
         return NeptuneAuthenticator(
             self.backend_swagger_client.api.exchangeApiToken(X_Neptune_Api_Token=api_token).response().result,
-            ssl_verify
+            ssl_verify,
+            proxies
         )
 
 
diff --git a/neptune/oauth.py b/neptune/oauth.py
index 120d43725..0afc6cf5c 100644
--- a/neptune/oauth.py
+++ b/neptune/oauth.py
@@ -21,7 +21,7 @@
 from requests.auth import AuthBase
 from requests_oauthlib import OAuth2Session
 
-from neptune.utils import with_api_exceptions_handler
+from neptune.utils import with_api_exceptions_handler, update_session_proxies
 
 
 class NeptuneAuth(AuthBase):
@@ -59,7 +59,7 @@ def _refresh_token(self):
 
 class NeptuneAuthenticator(Authenticator):
 
-    def __init__(self, auth_tokens, ssl_verify):
+    def __init__(self, auth_tokens, ssl_verify, proxies):
         super(NeptuneAuthenticator, self).__init__(host='')
         decoded_json_token = jwt.decode(auth_tokens.accessToken, verify=False)
         expires_at = decoded_json_token.get(u'exp')
@@ -78,6 +78,9 @@ def __init__(self, auth_tokens, ssl_verify):
             token_updater=_no_token_updater
         )
         session.verify = ssl_verify
+
+        update_session_proxies(session, proxies)
+
         self.auth = NeptuneAuth(session)
 
     def matches(self, url):
diff --git a/neptune/utils.py b/neptune/utils.py
index 2bc680adc..3c9efb120 100644
--- a/neptune/utils.py
+++ b/neptune/utils.py
@@ -139,6 +139,14 @@ def discover_git_repo_location():
     return None
 
 
+def update_session_proxies(session, proxies):
+    if proxies is not None:
+        try:
+            session.proxies.update(proxies)
+        except (TypeError, ValueError):
+            raise ValueError("Wrong proxies format: {}".format(proxies))
+
+
 def get_git_info(repo_path=None):
     """Retrieve information about git repository.
 
diff --git a/tests/neptune/test_oauth.py b/tests/neptune/test_oauth.py
index ecd384bf6..9f2d73199 100644
--- a/tests/neptune/test_oauth.py
+++ b/tests/neptune/test_oauth.py
@@ -102,7 +102,7 @@ def test_apply_oauth2_session_to_request(self, time_mock, session_mock):
         session.token = dict()
 
         # and
-        neptune_authenticator = NeptuneAuthenticator(auth_tokens, False)
+        neptune_authenticator = NeptuneAuthenticator(auth_tokens, False, None)
         request = a_request()
 
         # when