diff --git a/trains/backend_api/session/client/client.py b/trains/backend_api/session/client/client.py
index 6c394388..1eefa199 100644
--- a/trains/backend_api/session/client/client.py
+++ b/trains/backend_api/session/client/client.py
@@ -2,6 +2,7 @@ from __future__ import unicode_literals
 
 import abc
 import os
+import types
 from argparse import Namespace
 from collections import OrderedDict
 from enum import Enum
@@ -520,9 +521,11 @@ class APIClient(object):
     models = None  # type: Any
     projects = None  # type: Any
 
-    def __init__(self, session=None, api_version=None):
+    def __init__(self, session=None, api_version=None, **kwargs):
         self.session = session or StrictSession()
 
+        _api_services = kwargs.pop("api_services", api_services)
+
         def import_(*args, **kwargs):
             try:
                 return import_module(*args, **kwargs)
@@ -536,16 +539,20 @@ class APIClient(object):
                 for name, mod in (
                     (
                         name,
-                        import_(".".join((api_services.__name__, api_version, name))),
+                        import_(".".join((_api_services.__name__, api_version, name))),
                     )
-                    for name in api_services.__all__
+                    for name in _api_services.__all__
                 )
                 if mod
             )
         else:
             services = OrderedDict(
-                (name, getattr(api_services, name)) for name in api_services.__all__
+                (name, getattr(_api_services, name)) for name in _api_services.__all__
             )
+        self._update_services(services)
+
+    def _update_services(self, services):
+        # type: (Dict[str, types.ModuleType]) -> ()
         self.__dict__.update(
             dict(
                 {
@@ -553,4 +560,4 @@ class APIClient(object):
                     for name, module in services.items()
                 },
             )
-        )
+        )
\ No newline at end of file